A method of chromatically-corrected image demosaicing for a sensor with a colour filter array (CFA) such as a Bayer filter array. The demosaicing makes use of local chromatic aberration correction data to determine chromatically-corrected pixel positions for spatial interpolation. In implementations a chromatically-corrected quadratic adjustment is also applied.
A method of capturing content on an erasable, e.g. wipeable, board or surface. The method may comprise inputting camera data for a succession of image frames, the camera being directed towards the board or surface and the image frames comprising successive images of the board/surface from the camera. The method may further comprise processing data from the image frames to remove parts of the image frames corresponding to parts of a user or user pen writing or drawing on the board or surface to determine a succession of processed images of content on the board or surface; determining a content metric for each processed image, wherein the content metric is a metric of the amount of content in the processed image; determining key frame capture times from the content metrics for the processed images; and capturing processed images at the key frame capture times.
A method of distributed authorization of one or more client applications to one or more connected devices. The method comprises: receiving at a connected device,from a browser executing a client application, a client token and an access request. The client token has been provided to the client application by a process comprising generating one or more client tokens, one for each of one or more client applications (a client token defines permissions for a client application and a domain hosting the client application); signing the client tokens with a private key of a client token issuer, and distributing the client tokens to the client applications; verifying a signature of the client token using a public key of the client token issuer; determining whether the client token grants the client application permission for the access request and, if permission is granted:replying to the browser with a redirect response including an access token granting permission for the client application to access the connected device and identification of the domain hosting the client application from the client token; and executing the redirect response with the browser to make the access token available to the client application for use by the client application when requesting the connected device to perform a task.
The invention describes a device for use in adjusting the alignment of an illumination field on the surface of an interactive display, the device comprising: a contact surface for positioning on the surface of the interactive display; a sensor, located in a fixed position on the device with respect to the contact surface, for detecting energy associated with the illumination field; and an indicator for indicating when the sensor detects energy associated with the light surface.
We describe a method of capturing writing or drawing on a whiteboard. The method comprises: inputting camera data for a succession of image frames, wherein the camera data is from a camera directed towards the whiteboard and the image frames comprise successive images of the whiteboard from the camera; and user filter processing data from said image frames to remove parts of said image frames corresponding to parts of a user or user pen writing or drawing on said whiteboard. The user-filter processing comprises filtering to distinguish between motion of the user/user pen parts in the image frames and writing/drawing image information in the image frames which appears or changes during said writing or drawing but which is thereafter substantially unchanging. The method outputs writing/drawing data from the user filter-processing, this defining captured writing or drawing from the whiteboard.
We describe a touch sensing system comprising: one or more optical beam sources to provide a pair of optical beams; a pair of controllable beam deflectors comprising at least first and second beam deflectors, wherein said first beam deflector is configured to deflect a first said optical beam through a first angle towards a touch sensing region, and wherein said second beam deflector is configured to deflect a second said optical beam through a second angle towards said touch sensing region; first and second optical detectors to detect first and second scattered light from each of said first and second beams, wherein said first and second optical detectors are configured to detect scattered light counter-propagating along said first and second optical beams; and wherein said first and second beam deflectors are controlled in tandem to scan said touch sensing region.
We describe a touch sensing system comprising a light source to project light defining a touch sheet above a surface; a camera directed to capture a touch sense image from the touch sheet, comprising light scattered by an object; and a signal processor to process the touch sense image to identify a lateral location of the object on the surface. A brightness of the projected light is modulated to define bright, touch detecting intervals and dark intervals. The camera and the light projection are synchronised such that the camera selectively captures scattered light during the touch detecting intervals and rejects ambient light during the dark intervals. The system further comprises a pen. The pen comprises a photodetector to detect the projected light, a first light source detectable by the camera, and a controller coupled to control the first light source such that it is selectively illuminated during touch detecting intervals in synchronism with modulated projected light of the touch sheet.
G06F 3/0354 - Pointing devices displaced or positioned by the userAccessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
G06F 3/042 - Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
G06F 3/03 - Arrangements for converting the position or the displacement of a member into a coded form
G06F 1/16 - Constructional details or arrangements
We describe a touch sensing system comprising: an optical beam source to provide an optical beam; a pair of controllable beam deflectors comprising at least first and second beam deflectors, wherein the first beam deflector is configured to deflect the optical beam through a first angle towards a touch sensing region, and wherein the second beam deflector is configured to deflect scattered light from an object in the touch sensing region through a second angle; a detector, in particular a detector array; and an imaging system to image the deflected scattered light from the second beam deflector onto the detector array. The first and second beam deflectors are controlled in tandem to scan the touch sensing region.
We describe an eye box expander for a head-up display (HUD), the eye box expander comprising: a pair of optical surfaces defining a region therebetween; and an optical input to receive into said region an input beam for expansion; wherein a first of said optical surfaces defines an output surface for an output beam of said eye box expander; and wherein a second of said optical surfaces comprises a structured surface having a plurality of reflecting facets, each configured to reflect a part of said input beam to turn the respective part of said input beam through an angle, such that in combination said reflecting facets direct an expanded version of said input beam through said output surface.
M&C PC926457WO 4 3997988-1-pmartin ABSTRACT: A touch sensing system, for sensing the position of at least one object with respect to surface, the system comprising: a first, 2D touch sensing subsystem to detect a first location of said object with respect to a surface and to provide first location data; a second, object position sensing subsystem to detect a second location of said object, wherein said second location of said object is not constrained by said surface, and to provide second location data; a system to associate said first location data and said second location and to determine additional object-related data from said association; and a system to report position data for said object, wherein said position data comprises data dependent on at least one of said first and second locations and on said additional object-related data.
We describe a touch sensitive image display device, the device comprising: an image projector to project a displayed image onto a surface; a touch sensor optical system to project light defining a touch sheet above said displayed image; a camera directed to capture a touch sense image from a region including at least a portion of said touch sheet, said touch sense image comprising light scattered from said touch sheet by an object approaching said displayed image; and a signal processor coupled to said camera, to process a said touch sense image from said camera to identify a location of said object relative to said displayed image; wherein said object is provided with a retroreflective element to reflect light from said touch sheet.
We describe a touch sensitive image display device. The device comprises: an image projector to project a displayed image onto a surface in front of the device; a touch sensor light source to project light defining a touch sheet above the displayed image; a camera directed to capture a touch sense image comprising light scattered from the touch sheet by an object approaching the displayed image; and a signal processor to process a the touch sense image to identify a location of the object relative to the displayed image. The camera is able to capture an image projected by the image projector, the image projector is configured to project a calibration image, and the device includes a calibration module configured to use a calibration image from the projector, captured by the camera, to calibrate locations in said captured touch sense image with reference to said displayed image.
We describe a touch sensitive image display device comprising: an image projector to project a displayed image onto a surface; a touch sensor light source to project a plane of light above the displayed image; a camera to capture a touch sense image from light scattered from the plane of light by an approaching object; and a signal processor to process the touch sense image to identify a location of the object. The light path to the touch sensor camera includes a keystone-distortion compensating topical element, in particular a convex curved aspherical mirror.
A touch sensitive device, the device comprising: a touch sensor light source to project a plane of light above a surface; a camera directed to capture a touch sense image from a region including at least a portion of said plane of light, said touch sense image comprising light scattered from said plane of light by an object approaching or touching said surface; and a signal processor coupled to said camera, to process a said touch sense image from said camera to identify a lateral location of said object; wherein said signal processor is further configured to: detect when an oscillatory component of ambient light captured by said camera has a frequency different to an integral multiple of a frame rate of said camera; and adjust said frame rate of said camera responsive to said detection to an adjusted frame rate, such that said oscillatory component of said ambient light captured by said camera has a frequency within 10% of an integral multiple of said adjusted frame rate.
We describe a touch sensitive image display device comprising: an image projector to project a displayed image onto a surface; a touch sensor light source to project a plane of light above the displayed image; a camera to capture a touch sense image from light scattered from the plane of light by an approaching object; and a signal processor to process the touch sense image to identify a location of the object. The touch sensor light source is amplitude modulated, and signal processor is further configured to process a plurality of the touch sense images captured when said touch sensor light source is off to compensate for ambient light in a touch sense image captured when the touch sensor light source is on.
A touch sensitive device, the device comprising: a touch sensor light source to project a plane of light above a surface; a camera directed to capture a touch sense image from a region including at least a portion of said plane of light, said touch sense image comprising light scattered from said plane of light by a plurality of said objects simultaneously approaching or touching said surface; a signal processor coupled to said camera, to process a said touch sense image from said camera to identify a lateral location of each of said objects; and an output object position output, to provide output object positions for said plurality of objects; and wherein said signal processor is further configured to: input a succession of said touch sense images; process each said touch sense image to identify a plurality of candidate object touch positions; and filter said candidate object touch positions from said successive touch sense images to link said candidate object touch positions to previously identified output object positions for said plurality of objects; and update said previously identified output object positions using said linked candidate object touch positions.
We describe apparatus and methods for generating an image holographically, and also spatial light modulators for use in such techniques. In particular we describe a spatial light modulator (SLM, 500) comprising a plurality of light modulating pixels (502) for diffracting a beam of coherent light to generate an image from a hologram displayed on said SLM, wherein at least one of said light modulating pixels is replaced with a light sensing pixel (504) to sense an intensity of said beam of coherent light at a position of the light sensing pixel. The SLM may be incorporated in an optical assembly for a holographic image projection system, in combination with a laser illumination system to illuminate the SLM and an optical output system to output an image.
G03H 1/02 - Holographic processes or apparatus using light, infrared, or ultraviolet waves for obtaining holograms or for obtaining an image from themDetails peculiar thereto Details
We describe a method or providing a diffractive image display, the method comprising: displaying a diffraction pattern on pixels of a spatial light modulator (SLM), the SLM comprising a plurality of optical phase modulating pixels; and illuminating said SLM with a beam of light to reconstruct a far field image formed by said diffraction pattern; and wherein the method further comprises: providing a hexagonal or diamond shape for said pixels. In embodiments the pixels have a shape parameter S of greater than 0.333 where S is dependent on a pixel pitch in a horizontal direction in a lateral plande of said SLM (DELTAx), a pixel pitch in a vertical direction in a lateral plane of said SLM (DELTAy, a length of deadspace between pixels (DELTAos), and a maximum dimension of a said picel in a lateral plane of said SLM measured in said vertical direction (H).
G03H 1/02 - Holographic processes or apparatus using light, infrared, or ultraviolet waves for obtaining holograms or for obtaining an image from themDetails peculiar thereto Details
G03H 1/22 - Processes or apparatus for obtaining an optical image from holograms
G02B 26/08 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
We describe a road vehicle contact-analogue head up display (HUD) comprising: a laser-based virtual image generation system to provide a 2D virtual image; exit pupil expander optics to enlarge an eye box of the HUD; a system for sensing a lateral road position relative to the road vehicle and a vehicle pitch or horizon position; a symbol image generation system to generate symbology for the HUD; and an imagery processor coupled to the symbol image generation system, to the sensor system and to said virtual image generation system, to receive and process symbology image data to convert this to data defining a 2D image for display dependent on the sensed road position such that when viewed the virtual image appears to be at a substantially fixed position relative to said road; and wherein the virtual image is at a distance of at least 5m from said viewer.
G01S 5/00 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations
G01C 21/24 - NavigationNavigational instruments not provided for in groups specially adapted for cosmonautical navigation
This invention generally relates to displaying a substantially two-dimensional input image, and is particularly applicable for use in a head-up display. Display apparatus for displaying a substantially two-dimensional input image comprises: a first spatial light modulator configured to form a hologram on the basis of a first drive signal to phase modulate a beam of substantially coherent light; a second spatial light modulator comprising a plurality of pixels, the pixels configured to selectively amplitude modulate on the basis of a second drive signal the light modulated by the first spatial light modulator; and a controller configured to generate said second drive signal on the basis of said input image.
We describe a method of determining an aberration correction for a holographic image display system using a spatial light modulator (SLM) to display a hologram. Embodiments of the invention measure the corrections needed for a particular projection system, using the same system SLM as used to generate the images to provide wavefront- sensing holograms. The projector's projection optics are used to provide the wavefront sensor and there is no need for lenslets. Embodiments of the invention use a plurality of successive holograms directing light from differently-located patches on the hologram into the image.
We describe optical techniques for replicating an image to expand the exit pupil of a head-up laser-based image display system. The system includes image replication optics to replicate an image carried by a substantially collimated beam, the image replication optics comprising a pair of substantially planar reflecting optical surfaces defining substantially parallel planes spaced apart in a direction perpendicular to the parallel planes. The system is configured to launch the collimated beam into a region between the parallel planes such that the reflecting optical surfaces waveguide the beam between the surfaces in a plurality of successive reflections at front and rear optical surfaces. The front optical surface is configured to transmit a proportion of the collimated beam when reflecting the beam such that at each reflection of the collimated beam at the front optical surface a replica of the image is output from the image replication optics.
We describe a touch sensitive image display device for projecting a touch sensitive displayed image at an acute angle onto a surface on which the device is placed, the device comprising: a first light source to project a first light distribution; a second light source to project a second light distribution; a touch sensor system to remotely detect touch of an area of said surface within or adjacent to said displayed image by detecting change of said first light distribution, and having an output to provide a detected touch signal; a presence sensor system to remotely detect presence of an object at least partially within said second light distribution by detecting change of said second light distribution, and having an output to provide a detected presence signal; a controller configured to control said device responsive to said detected touch signal and further configured to control said device responsive to said detected presence signal.
We describe a touch sensitive holographic image display device (900) for holographically projecting a touch sensitive image at an acute angle onto a surface on which the device is placed. The device includes holographic image projection optics (902) comprising at least one coherent light source illuminating a spatial light modulator (SLM), output optics to project a hologram onto an acute angle surface, and a remote touch sensing system to remotely detect a touch of a location within or adjacent to the holographically displayed image (906). A control system is configured to provide data defining an image for display, to receive detected touch data, and to control the device responsive to remote detection of a touch of a the displayed image.
We describe a touch sensitive image display device for projecting a touch sensitive displayed image at an acute angle onto a surface on which the device is placed, the device comprising: a light source to project a substantially two-dimensional first light distribution in a first plane; a light source to project a substantially two- dimensional second light distribution in a second plane, wherein said second plane is different to said first plane; a multi-pixel sensor system to remotely detect touch of an area of said surface within or adjacent to said displayed image by detecting light from said first distribution, and having an output to provide a detected touch signal; said multi-pixel sensor system to remotely detect presence of an object at least partially within said second light distribution by detecting light from said second distribution, and having an output to provide a detected presence signal; and said controller having an input to receive said detected touch signal and an input to receive said detected presence signal and configured to control said touch sensitive image display device responsive to said signals, wherein said device is configured to multiplex projection of the first light distribution and projection of the second light distribution.
We describe a holographic image projection system for projecting an image at an acute angle onto a surface, the system comprising: a spatial light modulator (SLM) to display a hologram; an illumination system to illuminate said displayed hologram; projection optics to project light from said illuminated displayed hologram onto said surface at an acute angle form said image; and a processor having an input to receive input image data for display and an output to provide hologram data for said SLM, wherein said processor is configured to: input image data and convert this to target image data; generate from said target image data hologram data for display as a hologram on the SLM to reproduce a target image; and wherein said target image is distorted to compensate for said projection of said hologram at an acute angle to form said image.
This invention relates to holographic image display systems (200), and to related methods and processor control code. We describe a method of displaying an image holographically, the method comprising: inputting display image data defining said image for display; processing said image data to determine first image data representing a first spatial frequency portion of said image data and second image data (206) representing a second spatial frequency portion of said image data, wherein said second spatial frequency is higher than said first spatial frequency; displaying a hologram (204) of said first image data on a spatial light modulator (SLM1) to form a holographically-generated intermediate real image; onto a second spatial light modulator (SLM2) which modulates the intensity of said intermediate real image using said second image data (206) to display said image.
The invention relates to holographic head-up displays, to holographic optical sights, and also to 3D holographic image displays. We describe a holographic head-up display and a holographic optical sight, for displaying, in an eye box of the display/sight, a virtual image comprising one or more substantially two-dimensional images, the head-up display comprising: a laser light source; a spatial light modulator (SLM) to display a hologram of the two-dimensional images; illumination optics in an optical path between said laser light source and said SLM to illuminate said SLM; and imaging optics to image a plane of said SLM comprising said hologram into an SLM image plane in said eye box such that the lens of the eye of an observer of said head-up display performs a space-frequency transform of said hologram on said SLM to generate an image within said observer's eye corresponding to the two-dimensional images.
The invention relates to techniques for speckle reduction in holographic optical systems, in particular holographic image display systems. We describe a holographic image display system for displaying an image holographically on a display surface, the system comprising: a spatial light modulator (SLM) to display a hologram; a light source to illuminate said displayed hologram; projection optics to project light from said illuminated displayed hologram onto said display surface to form a holographically generated two-dimensional image, said projection optics being configured to form, at an intermediate image surface, an intermediate two-dimensional image corresponding to said holographically generated image; a diffuser located at said intermediate image surface; and an actuator mechanically coupled to said diffuser to, in operation, move said diffuser to randomise phases over pixels of said intermediate image to reduce speckle in an image displayed by the system.
This invention relates to methods, apparatus, and computer program code for the holographic display of images. We describe a method of displaying an image holographically, the method comprising displaying a hologram on pixels of a spatial light modulator (SLM) and illuminating said SLM such that said image is displayed in pixels of a replay field (RPF) of said hologram, and wherein the method further comprises subdividing said replay field into a plurality of spatially interlaced regions, and displaying holograms for each of said interlaced regions of said replay field sequentially at different times such that in an observer's eye said interlaced regions integrate to give the impression of said image and such that interference between adjacent pixels of said replay field is reduced.
This invention relates to methods and apparatus for displaying images holographically. A method of displaying an image holographically using a spatial lightmodulator (SLM), said SLM having a plurality of SLM pixels, the method comprising: displaying a diffraction pattern on said pixels of said SLM; and illuminating said pixels of said SLM such that light diffracted by said diffraction pattern on said SLM pixels comprises a content of said displayed image, a variation in brightness of said displayed image across said displayed image being modulated by an intensity envelope determined by the diffraction pattern of an individual said pixel, for example a sinc envelope; and wherein the method further comprises moving a peak or centre of gravity of said intensityenvelope away from a zero order spot and towards a centre of said displayed image by imposing a pattern of phase delay across said SLM pixels, said pattern of phase delay repeating at a spatial interval corresponding to a pixel interval of said SLM.
A holographic head up display (HUD) for a vehicle to display an image holographically on a curved display surface such as a windshield, the HUD comprising: a spatial light modulator (SLM) t o display a hologram; an illumination system to illuminate said displayed hologram; projection optics to project light from said hologram onto said display surface to form said image; and a processor configured to process said image data to generate hologram am data for display on said SLM to form said image; said HUD further comprising a non - volatile data memory coupled to said processor to store wavefront correction data for said display surface; and wherein said processor is configured to apply a wavefront correction responsive to said stored wavefront correction data when generating said hologram data to correct said image for aberration due to a shape of said display surface.
This invention generally relates to systems, methods and computer program code for communicating and processing images, in particular video using holographic techniques. A method of providing a two-dimensional image display for a mobile device, the method comprising: encoding said two-dimensional image as a hologram; sending hologramdata for said hologram to said mobile device; and displaying said hologram data at said mobile device to project said two-dimensionalimage display.
This invention relates to methods and apparatus for the holographic display of images. We describe a method of compensating for spatial phase non-uniformities in a holographic image display system, the system including a substantially coherent light source illuminating an SLM (24), the method comprising sequentially displaying substantially the same hologram (40) at a plurality of different positions (40a, 40b) on said SLM (24) such that the displayed holographic images successively replayed by said differently positioned holograms (40a, 40b) average to provide a holographic displayed image with increased uniformity.
This invention relates to methods, apparatus, and computer program code for the holographic display of images. We describe a method of displaying an image holographically, the method comprising: dividing said image into a plurality of spatial tiles; and displaying (24), for each said tile in rapid succession, at least one hologram (104) to reproduce an image of the tile, to give the impression of said plurality of the tiles together; and wherein the method further comprises controlling a shutter spatial light modulator (SLM, 900) located in a replay phone where a reconstruction or replay image of the holograms is formed such that when each said tile is displayed, diffracted light corresponding to areas for the others of said plurality of tiles is substantially blocked.
We describe a hardware error diffusion calculation system (1004) for performing an error diffusion quantisation of a hologram. The system comprises address and data buses (622, 624, 626) for a first, hologram memory block storing data representing pixels of said hologram,- for a second, error memory block storing an error matrix representing errors in quantising said hologram; for a third, diffusion weights memory block storing a set of diffusion weights for said error diffusion calculation; and a plurality of error diffusion processor (602) blocks each coupled to said address and data buses, each being configured for sequential processing of a spatial region of said hologram. A said processor block includes a pixel address generator to generate a sequence of pixel addresses for a said spatial region for processing by the processor block and an error diffusion calculation block (616) coupled to said pixel address generator and to said address and data buses to perform an error diffusion calculation for a pixel of said hologram ident ified by a said pixel address. Memory corresponding the spatial regions processed by said processor blocks overlap and each of said processor blocks has a different start pixel address such that said processor blocks are able to perform error diffusion calculations with respective error diffusion calculation blocks on different pixels of the hologram in parallel.
This invention relates to method, apparatus and computer program code for improved techniques for holographic image display systems. A method of generating data for a pixellated hologram display device (24) in optical contact with a phase mask (25) represented by phase mask data, for generating a holographic image, the method comprising: inputting image data (102) for said holographic image; performing a holographic transform (100) on data derived from said image data to generate hologram data (m) for said hologram display device (24), using said phase mask data to adjust said hologram data for corresponding regions of said hologram display device and said phase mask; and quantising said hologram data (m) to generate quantised pixel data (104) for display on said hologram display device (24) with said phase mask (25) to generate said holographic image (14); wherein said quantising is performed successively for pixels of said hologram display y device; and wherein the method further comprises: determining an error in said data for a pixel of said hologram display device resulting from said quantising and using said error data to compensate said hologram data (mc) prior to quantising said hologram data to generate quantised pixel data for a further pixel of said hologram display device.
We describe a method of projecting a colour image on a screen holographically, comprising: inputting colour image data comprising data for at least two colour planes of said image, a first, longer wavelength colour plane and a second, shorter wavelength colour plane; generating data for respective first and second holograms from said first and second colour planes, said first hologram having a greater resolution than said second hologram; and displaying said first and second holograms in turn on a common spatial light modulator (SLM) illuminated by light of respective said first and second wavelengths to project said colour image onto said screen; and wherein a scaling in resolution between said first and second holograms is dependent on scaling between said first and second wavelengths such that, when projected on said screen pixels of said image generated by said first and second holograms have substantially the same pitch.
This invention relates to optical systems for holographic projectors. A holographic image projection system, the system comprising: a spatial light modulator (SLM) for displaying a hologram; first optics to provide an input beam to said SLM; second optics to process an output beam from said SLM to provide a displayed image; and a hologram processor to receive image data for display and to output data to said SLM to display a hologram to provide said displayed image; and wherein at least one lens of said first optics or said second optics is encoded in said hologram.
09 - Scientific and electric apparatus and instruments
35 - Advertising and business services
38 - Telecommunications services
42 - Scientific, technological and industrial services, research and design
Goods & Services
Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments; lasers (not for medical purposes); lasers for scientific and industrial use; laser instruments and installations, other than for medical use; projectors; computer software, computer programmes and computer hardware for use with lasers or projectors; optical apparatus and instruments; projectors; laser projection apparatus and instruments; digital video projectors; pocket projectors, ultra-miniature projectors; electronic handheld information devices; cameras, computers; lap-top computers; portable music players; portable video players; mobile telephones; apparatus and instruments for displaying information, images, measurements and/or signals; apparatus for the graphic display of data; apparatus and instruments for fitting to vehicles and aircraft to display visual information; aircraft cockpit instrumentation; helmet mounted display apparatus; parts and fittings for all the aforesaid goods; telecommunication apparatus and instruments. Storage and processing of data, images or sound and information by electronic means or via the internet. Telecommunication services and internet services; telecommunicaton network services; computer aided transmission of messages and images; communications services by satellite, by electronic means or via the internet; transmission of data, images or sound and information by electronic means or via the internet; providing access to electronic communications networks and electronic databases; transmission services between network computer systems; all included in class 38. Scientific and technological services and research and design relating thereto; industrial analysis and research services; design and development of computer hardware and software relating to lasers and projectors.
09 - Scientific and electric apparatus and instruments
38 - Telecommunications services
42 - Scientific, technological and industrial services, research and design
Goods & Services
Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments; lasers (not for medical purposes); lasers for scientific and industrial use; laser instruments and installations, other than for medical use; projectors; computer software, computer programmes and computer hardware for use with lasers or projectors; optical apparatus and instruments; projectors; laser projection apparatus and instruments; digital video projectors; pocket projectors, ultra-miniature projectors; electronic handheld information devices; cameras, computers; lap-top computers; portable music players; portable video players; mobile telephones; apparatus and instruments for displaying information; images, measurements and/or signals; apparatus for the graphic display of data; apparatus and instruments for fitting to vehicles and aircraft to display visual information; aircraft cockpit instrumentation; helmet mounted display apparatus; parts and fittings for all the aforesaid goods; telecommunication apparatus and instruments. Telecommunication services and internet services; network services; computer aided transmission of messages and images; communications services by satellite, by electronic means or via the internet; transmission, storage and processing of data, images or sound and information by electronic means or via the internet; providing access to electronic communications networks and electronic databases; transmission services between network computer systems; all included in class 38. Scientific and technological services and research and design relating thereto; industrial analysis and research services; design and development of computer hardware and software relating to lasers and projectors.
42.
METHODS AND APPARATUS FOR DISPLAYING IMAGES USING HOLOGRAMS
This invention generally relates to techniques for displaying an image using a plurality of holographically generated subframes (HI... HN). More particularly the invention is concerned with methods, apparatus and computer program code for enhancing the effective resolution of images displayed in this way. A method of generating data for displaying an image defined by a plurality of holographically generated subframes (HI... HN) for display sequentially in time, the method comprising: receiving data (T) for said image for display; determining holographic data (H' ) for a said subframe from target image data (T' T' ' ) at a first spatial resolution (2M); converting said holographic data (H') to subframe data (H) for display to generate a said holographic subframe (HI... HN), said subframe data (H) having a second spatial resolution (M) lower than said first spatial resolution; numerically generating reconstructed image data (X, R) at said first spatial resolution from said subframe data (H), adjusting said target image data (T', T' ') using said reconstructed image data (X, R); and determining holographic data (H') for a subsequent said subframe using said adjusted image data (T').
The invention relates to method, computer program code and signal processing/ image display systems for displaying one or more images using holographic techniques. We describe a method of generating data for displaying an image defined by displayed image data using a plurality of holographically generated temporal sub frames, the temporal subframes being displayed sequentially in time such that they are perceived as a single noise-reduced image. The method comprises generating holographic data from the displayed image data for each sub frame of said set of subframes such that successive replay of holograms defined by said holographic data for said subframes gives the appearance of said image, and wherein the method further comprises, when generating said holographic data for a said subframe, compensating for noise in said displayed image arising from one or more previous subframes of said sequence of holographically generated subframes .
This invention relates to hardware acceleration of signal processing systems for displaying an image using holographic techniques. A hardware accelerator for a holographic image display system, the image display system being configured to generate a displayed image using a plurality of holographically generated temporal subframes, said temporal subframes being displayed sequentially in time such that they are perceived as a single reduced-noise image, each said subframe being generated holographically by modulation of a spatial light modulator with holographic data such that replay of a hologram defined by said holographic data defines a said subframe, the hardware accelerator comprising: an input buffer to store image data defining said displayed image; an output buffer to store holographic data for a said subframe; at least one hardware data processing module coupled to said input data buffer and to said output data buffer to process said image data to generate said holographic data for a said subframe; and a controller coupled to said at least one hardware data processing module to control said at least one data processing module to provide holographic data for a plurality of said subframes corresponding to image data for a single said displayed image to said output data buffer.
This invention relates to electronic devices incorporating a holographic projector. A holographic projection module for a consumer electronic device, the holographic projection module comprising: at least one substantially monochromatic light source (12); a spatial light modulator (24) (SLM) to phase modulate light (22) from said light source to provide a phase hologram for generating a two-dimensional displayed image (14); projection optics to project said phase modulated light to form said two-dimensional displayed image; wherein said projection optics comprise an optical system (26) configured to demagnify a conventional, non-holographic image, to increase the divergence of said light forming said displayed image,- and a digital signal processor (100) to generate data for a plurality of temporal holographic sub frames from a desired image for display, for modulating said SLM, such that temporal averaging amongst the subframes reduces the perceived level of noise, in said displayed image when images corresponding to the subframes are displayed successively and sufficiently fast that they are integrated together in the eye of a human observer.
