An optical waveguide system with angle-multiplexing polarization volume gratings and an electronic device are disclosed. The system comprises: a waveguide; an input coupler coupling a combined image light for a combined image into the waveguide; and an output coupler coupling the combined image light out of the waveguide. The combined image light includes a first image light for a first image and a second image light for a second image, which are combined to from the combined image. The first image light and the second image light have different polarizations. The output coupler includes first and second output polarization volume gratings, which are optimized for different polarizations, respectively, wherein the first output polarization volume grating couples the first image light out of the waveguide, and the second output polarization volume grating couples the second image light out of the waveguide.
An optical waveguide system and an electronic device are disclosed. The optical waveguide system comprises: a waveguide; an input coupler, coupling a light including a first and a second color component into the waveguide; and an output coupler, including: a first polarization color filter, converting the first color component of a first polarization state into the first color component of a second polarization state without changing the second color component of the first polarization state; a first polarization volume grating, coupling the first color component out of the waveguide; a second polarization color filter, converting the second color component of the first polarization state into the second color component of the second polarization state without changing the first color component of the first polarization state; a second polarization volume grating, coupling the second color component out of the waveguide.
c(x); applying the permittivity tensor into Maxwell equations; obtaining electromagnetic field for the anisotropic-material-based grating by using boundary conditions of at least two layers or sublayers of the anisotropic-material-based grating to obtain a diffraction efficiency for the anisotropic-material-based grating.
An optical display system and an augmented reality electronic device are disclosed. The optical display system comprises: a waveguide; an input coupler, provided at the input end of the waveguide and couples an image light into it; and a two-dimensional grating, provided at the output end of waveguide. The waveguide delivers the image light to the two-dimensional grating, which performs pupil expansion on the image light and out-couples the expanded image light. The two-dimensional grating has rhombus lattices. Unit cells of the two-dimensional grating are un-symmetric along respective axes parallel with a propagation direction of the image light incident onto the two-dimensional grating, from a top view of the two-dimensional grating. The unit cells are oriented with the propagation direction of the image light and each of the unit cells has at least two vertexes at its end side.
G02B 6/293 - Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
G02B 27/00 - Optical systems or apparatus not provided for by any of the groups ,
An optical waveguide system and an electronic device are disclosed. The system comprises: a waveguide; an input coupler coupling a light into the waveguide; and an output coupler, wherein the input coupler includes a right portion and a left portion, wherein the right portion includes stacked first and second polarization volume gratings, the left portion includes stacked third and fourth polarization volume gratings. The first and fourth polarization volume gratings are polarization volume gratings optimized for a right-hand-side field of view of the light, and the third and second polarization volume gratings are polarization volume gratings optimized for a left-hand-side field of view of the light.
Disclosed are an optical system, an assembling method and a virtual reality device. The optical system comprises a display unit, a first lens and a second lens in sequence along a light transmission direction, wherein the first lens comprises a first surface protruding towards the display unit and a second surface protruding towards the second lens, the second lens comprises a third surface recessed towards the first lens and a fourth surface away from the first lens, a side of the second surface that is close to the fourth surface is provided with a first phase retarder and a reflective polarizer, a radius of curvature of the second surface is greater than or equal to a radius of curvature of the third surface, and a side of the first lens that is close to the display unit is provided with an optical splitter.
G02B 13/18 - Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
G02B 27/62 - Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems
Disclosed are an optical system and a virtual reality device. The optical system comprises a display unit (10) and a first lens (20), the first lens (20) comprises a first surface (21) and a second surface (22), and the second surface (22) has a planar structure; an optical splitter is provided between the first surface (21) and the display unit (10); a first phase retarder (30) and a polarization reflector (40) are provided at a side of the first lens (20) away from the display unit (10), and the first phase retarder (30) is provided between the first lens (20) and the polarization reflector (40); and light emitted from the display unit (10) enters into the first lens (20) from the first surface (21), and is sequentially reflected by the second surface (22) and the first surface (21), and then exits the optical system from the second surface (22).
Disclosed are a compensating lens set and a virtual reality apparatus with the same. The compensating lens set is applied to a folded optical path system. The folded optical path system sequentially comprises, in an optical axis direction, a display unit, a first lens set and a diaphragm. The compensating lens set is arranged between the first lens set and the display unit, the compensating lens set comprising a first compensating lens, the first compensating lens comprising a first surface and a second surface. The first lens set comprises a third surface and a fourth surface. An incident light emitted by the display unit enters the first compensating lens from the first surface, and is emitted out of the first compensating lens from the second surface, passes through the first lens set, and then is transmitted to the diaphragm.
Provided are a positioning method and apparatus for a display screen in an optical module. The positioning method for the display screen in the optical module comprises the following steps: arranging light paths of an optical lens and image receiving device of a product coaxially; providing the display screen, and activating the display screen, wherein the display screen displays an image, and a light path formed by a light ray from the image passes through the optical lens; the image receiving device receives the light path passing through the optical lens in real time to obtain a virtual image; calculating a slope deviation of the display screen; calculating a distance deviation from the display screen to the optical lens; calculating a plane position deviation of the display screen; and calibrating a relative position of the display screen according to a calculation result.
The present invention discloses a driving current correction method and apparatus for multiple laser devices, and a laser projector, A specific embodiment of the method includes in projection periods of n-th to (n+m−1)-th pixel points: detecting light intensity information of a combined laser after being combined lasers emitted from in laser devices in a laser source by using a light sensor, and respectively acquiring actual light intensities of combined lasers when the n-th to the (n+m−1)-th pixel points are projected according to an electric signal output by the light sensor, a number of the laser devices in the laser source being m; establishing a system of linear equations with in variables according to a driving current of each laser device and the actual light intensities of the combined lasers when the n-th to the (n+m−1)-th pixel points are projected, and solving a corresponding relation between the driving current of the each laser device and an actual light intensity of the laser emitted from the each laser device; from a projection of a (n+m)-th pixel point: correcting the driving current of the each laser device according to a set light intensity of the each laser device and the corresponding relation between the driving current of the each laser device and the actual light intensity of the laser emitted from the each laser device. The implementation has a high consistency of detecting light intensity information that can be simply performed.
Provided are a method and an apparatus for detecting pixel defect of optical module, and a device, where the method includes: graying an image obtained by imaging a test binary image by an optical module in a darkroom environment to obtain a first grayscale image; determining a first grayscale area and a second grayscale area corresponding to two gray levels in the test binary image from the first grayscale image; determining a pixel point not matching a grayscale feature of respective grayscale region from the first grayscale area and the second grayscale area respectively as a pixel defect point; and determining the pixel defect of the optical module according to the pixel defect point. The technical solution provided in the present disclosure can detect accurately a pixel defect of an optical module which is advantageous in optimizing the processing technology of the optical module.
Provided are a method and an apparatus for correcting a color convergence error. The method includes: in a dark room environment, collecting a projection light point on a projection screen projected by a projection system, to obtain a projection image; adjusting the test pattern, so that a first projection light point corresponding to the white point of a first coordinate on the test pattern after being projected by a first color light source is located in a center of the projection image; obtaining a second and/or a third projection light points corresponding to the white point of the first coordinate after being projected by a second and/or a third color light sources from the projection image; and adjusting an assembly parameter of the projection system according to a position of the second and/or the third projection light points and a position of the first projection light point.
Provided are a method and an apparatus for correcting a color convergence error, and a device. The method includes: in a darkroom environment, acquiring a projection image obtained by projecting a test pattern containing N white shape points by a projection system, where N is an integer greater than or equal to 2; performing color separation on N shape image points on the projection image, to obtain N shape image points corresponding to R, G, and B color components respectively; determining color coordinates corresponding to R, G, and B according to the N shape image points corresponding to R, G, and B color components respectively; and adjusting an assembly parameter of the projection system according to the color coordinates corresponding to the R, G, and B. The present disclosure may detect and correct color convergence error of the projection system.
Provided are a method and an apparatus for correcting a color convergence error, and a device. The method includes: controlling a projection system to project a first test pattern containing three sets of monochromatic test points and a second test pattern containing three sets of R, G, and B test points, to collect a first projection image and a second projection image on the projection screen; acquiring a first center-of-mass coordinate and a second center-of-mass coordinate corresponding to projection image points on the first projection image and the second projection image; calculating color noises corresponding to R, G, and B according to the first center-of-mass coordinate and the second center-of-mass coordinate; calculating color coordinates corresponding to the R, G, and B according to the color noises corresponding to the R, G, and B and the second center-of-mass coordinate; and adjusting an assembly parameter of the projection system.
Provided are a method and an apparatus for adjusting an exposure time of a camera and a device, where the method includes: controlling the camera to collect an imaging light spot of an imaging component with a first exposure time; obtaining an energy value received when the camera collecting the imaging light spot; if the energy value is not within a set energy range, obtaining a curve parameter corresponding to an exposure time-energy curve according to the energy value and the first exposure time; calculating an estimated exposure time corresponding to an optimal energy value according to the curve parameter; and updating the first exposure time with the estimated exposure time corresponding to the optimal energy value. The technical solution provided in the present disclosure can adjust the exposure time of the camera to a reasonable value so as to improve the accuracy and reliability of light spot analysis.
Provided are a method and an apparatus for adjusting an exposure time of a camera and a device, where the method includes: controlling the camera to collect an imaging light spot of an imaging component with a first exposure time; obtaining an energy value received when the camera collecting the imaging light spot; if the energy value is not within a set energy range, adjusting a duration of the first exposure time according to a relationship between the energy value and the energy range to update the first exposure time. The technical solution provided in the present disclosure can adjust the exposure time of the camera to a reasonable value so as to improve the accuracy and reliability of light spot analysis.
The present invention discloses a driving current correction method and apparatus for multiple laser devices, and a laser projector. A specific embodiment of the method includes in a projection period of a n-th pixel point: sequentially driving a plurality of laser devices of a laser source to emit laser, and respectively detecting light intensity information of lasers emitted from the plurality of laser devices by using a light sensor; acquiring an actual light intensity of the lasers emitted from the plurality of laser devices according to an electric signal output by the light sensor, and establishing a corresponding relation between a driving current and an actual light intensity of each laser device according to the driving current of the each laser device and the actual light intensity of the laser emitted from the each laser device when the n-th pixel point is projected; from a projection of a (n+1)-th pixel point: correcting the driving current of the each laser device according to a set light intensity of the each laser device and the corresponding relation between the driving current and the actual light intensity of the each laser device. The implementation has a high consistency of detecting light intensity information that can be simply performed.
H01S 3/131 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
H01S 3/23 - Arrangement of two or more lasers not provided for in groups , e.g. tandem arrangement of separate active media
19.
AR display method, apparatus and device provided micro mirror array
Provided are an AR display method, an AR display apparatus and an AR display device, the device including: a display assembly used for displaying a virtual content, an optical assembly, and a micro mirror array coupled to the optical assembly; the micro mirror array is located on a propagation path of light emitted from the display assembly.
An apparatus and a method for assembling optical module. The apparatus includes: a plurality of fixtures, an alignment mechanism, a power supply, a spectroscopic prism with a light incident surface close to the plurality of optical modules to be aligned, a first image collecting unit close to a first light emitting surface of the spectroscopic prism and a second image collecting unit with a second light emitting surface of the spectroscopic prism; the controller is configured to determine a light spot that does not meet a quality requirement according to the positions and/or sizes of the plurality of imaging light spots, and generate a corresponding aligning instruction, and determine a to-be-assembled lens corresponding to the light spot that does not meet requirements according to a correspondence between a to-be-assembled lens and the light spot, and output the aligning instruction to an alignment mechanism to adjust a position of the lens.
B23P 19/04 - Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformationTools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses
G05B 19/418 - Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
B25J 11/00 - Manipulators not otherwise provided for
G01B 11/27 - Measuring arrangements characterised by the use of optical techniques for measuring angles or tapersMeasuring arrangements characterised by the use of optical techniques for testing the alignment of axes for testing the alignment of axes
21.
Speckle elimination apparatus, laser light source and laser projection system
A speckle elimination apparatus, a laser light source and a laser projection system, the speckle elimination apparatus comprising a diaphragm (100) and a ¼ wave plate group sequentially arranged on a laser beam optical path, the ¼ wave plate group comprising a first ¼ wave plate (200) and a second ¼ wave plate (300) having optical axis angles of 75°-105°, adjacent sides of the first ¼ wave plate (200) and the second ¼ wave plate (300) being closely arranged, the first ¼ wave plate (200) being arranged so as to allow a portion of an incident laser beam to pass through, the second ¼ wave plate (300) being arranged so as to allow the remainder of the incident laser beam to pass through, the portion of the incident laser beam being 25%-75% of the incident laser beam. The speckle elimination apparatus eliminates the phenomenon of laser speckle.
A speckle elimination apparatus, a laser light source and a laser projection system, the speckle elimination apparatus comprising a wave plate (100) and a transmission plate (200) respectively arranged on a laser beam light path, the wave plate (100) and the transmission plate (200) having similar refractive indices and closely arranged adjacent sides, the wave plate (100) being arranged so that an incident surface allows a portion of an incident laser beam to pass through, the transmission plate (200) being arranged so that an incident surface allows the remainder of the incident laser beam to pass through, the portion of the incident laser beam being 25%-75% of the incident laser beam. The speckle elimination apparatus eliminates the phenomenon of laser speckle, and prevents stray light from being produced during laser speckle elimination.
Provided are a method and an apparatus of optical module assembly, where the method includes: when an optical module to be aligned images, controlling an alignment mechanism clamping a lens to be assembled to move in a set direction by a set movement step; when the alignment mechanism moves each time, collecting, by an image acquisition device, light spots imaged by the optical module to be aligned sequentially, and selecting a light spot with a minimum size from the collected light spots; determining an optimal position of the alignment mechanism according to at least two light spots before the light spot with the minimum size and at least two light spots thereafter; and controlling the alignment mechanism to move to the optimal position to align the lens to be assembled.
G01B 11/27 - Measuring arrangements characterised by the use of optical techniques for measuring angles or tapersMeasuring arrangements characterised by the use of optical techniques for testing the alignment of axes for testing the alignment of axes
G02B 7/00 - Mountings, adjusting means, or light-tight connections, for optical elements
Provided are an apparatus and a method for assembling optical module. The apparatus includes: a working bench, a controller and a plurality of mechanical components for active alignment of optical modules; a conveying mechanism is provided on the working bench, and a plurality of fixtures are provided on the conveying mechanism with even space therebetween and are movable with the conveying mechanism; the plurality of mechanical components are configured to perform corresponding operations on the fixtures moved to respective operating positions under control of the controller.
B23P 19/00 - Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformationTools or devices therefor so far as not provided for in other classes
B23P 21/00 - Machines for assembling a multiplicity of different parts to compose units, with or without preceding or subsequent working of such parts, e.g. with programme control
B23P 19/04 - Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformationTools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
Provided are a method and an apparatus of optical module assembly, where the method includes: when an optical module to be aligned images, controlling an alignment mechanism clamping a lens to be assembled to move in a set direction by a set movement step; when the alignment mechanism moves each time, collecting light spots imaged by the optical module to be aligned sequentially, and selecting an estimated light spot with a minimum size from the collected light spots; searching for an ideal light spot with a minimum size according to a reduced movement step and the estimated light spot with the minimum size; determining a movement position of the alignment mechanism when the ideal light spot with the minimum size is collected as an optimal position of the alignment mechanism; and controlling the alignment mechanism to move to the optimal position to align the lens to be assembled.
G01B 11/27 - Measuring arrangements characterised by the use of optical techniques for measuring angles or tapersMeasuring arrangements characterised by the use of optical techniques for testing the alignment of axes for testing the alignment of axes
G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses
Provided is an optical module assembly device, including: a fixing member for fixing an optical member to be assembled, a power supply component for supplying power to the optical member to be assembled, and an alignment mechanism for placing a lens to be assembled at the specified position; a beam splitting prism with an in-light surface close to the optical member to be assembled, a first image acquisition device close to a first out-light surface of the beam splitting prism and coaxial with the first out-light surface, and a second image acquisition device close to a second out-light surface of the beam splitting prism and coaxial with the second out-light surface; and a controller configured to control the alignment mechanism to adjust a position of the lens to be assembled according to the images captured by the first image acquisition device and the second image acquisition device.
An apparatus and a method for assembling optical module. The apparatus includes: a plurality of fixtures, an alignment mechanism, a power supply, a spectroscopic prism with a light incident surface close to the plurality of optical modules to be aligned, a first color image collecting means close to a first light emitting surface of the spectroscopic prism and a second color image collecting means with a second light emitting surface of the spectroscopic prism; the controller is configured to determine a light spot that does not meet a quality requirement according to the positions and/or sizes of the plurality of imaging light spots, and generate a corresponding aligning instruction, and determine a to-be-assembled lens necessary to be adjusted according to a color of the light spot that does not meet quality requirements, and output the aligning instruction to an alignment mechanism to adjust a position of the lens necessary to be adjusted.
An apparatus and a method for assembling optical module is provided and the method includes: controlling an alignment mechanism holding a to-be-assembled lens to move at a preset step-size in a preset direction when an optical module to be aligned generates an image; collecting light spots of the images generated by an optical module to be aligned sequentially by an image collecting means, each time the alignment mechanism moves; selecting a light spot with a minimum size from the collected light spots, and determining a movement position of the alignment mechanism when the light spot with the minimum size is collected, as an optimal position; controlling the alignment mechanism to move to the optimal position to align the to-be-assembled lens.
G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses
G02B 27/62 - Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems
B23P 15/00 - Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
G02B 7/04 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
G02B 27/12 - Beam splitting or combining systems operating by refraction only
G01B 11/27 - Measuring arrangements characterised by the use of optical techniques for measuring angles or tapersMeasuring arrangements characterised by the use of optical techniques for testing the alignment of axes for testing the alignment of axes
B23P 19/04 - Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformationTools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
G02B 7/00 - Mountings, adjusting means, or light-tight connections, for optical elements
Provided are an eyepiece and a head-mounted display device, where the eyepiece includes: a positive lens and a negative lens arranged sequentially and coaxially; where a light incident surface of the positive lens is a planar Fresnel surface, and a light emergent surface of the positive lens is a convex surface; a light incident surface of the negative lens is a concave surface, and a light emergent surface of the negative lens is a convex surface; and the light to be observed is incident on the light incident surface of the negative lens and refracted by the negative lens to the light incident surface of the positive lens, and enters human eyes after being refracted by the positive lens. The eyepiece and head-mounted display device provided by the present disclosure realize an ultrathin eyepiece optical system and facilitate a miniaturized and lighter head-mounted display device.
Some embodiments of the present disclosure provide a prismatic AR display device comprising an LCOS display chip, a polarization beam splitter (PBS), a double cemented lens, a first single lens and a beam splitting prism sequentially arranged along a first axis, and LCOS lighting apparatus arranged on a second axis perpendicular to the first axis and is close to the PBS. A negative lens in the double cemented lens is close to the PBS, and a positive lens in the double cemented lens is close to the first single lens; a first light incident surface of the beam splitting prism is close to the first single lens, and an optical axis of the first light incident surface coincides with that of the first single lens; and an optical axis of a second light incident surface of the beam splitting prism is perpendicular to that of the first light incident surface.
There is provided in the present disclosure a head-mounted display device, including: a first positive lens, a second positive lens and a micro-display component arranged coaxially and sequentially, where a light incident surface of the first positive lens is close to a light emergent surface of the second positive lens, and a light incident surface of the second positive lens is close to the micro-display component; the light emergent surface of the second positive lens is a convex Fresnel surface, and the light incident surface of the first positive lens is a planar Fresnel surface. The head-mounted display device provided by the present disclosure can effectively enlarge the field angle and reduce the volume.
G02B 27/09 - Beam shaping, e.g. changing the cross-sectioned area, not otherwise provided for
G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses
G02B 9/04 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having two components only
32.
Laser beam scanning display device and augmented reality glasses
The present disclosure provide a laser beam scanning display device and augmented reality (AR) glasses, comprising a focusing lens, a laser emitter located at a focal point of the focusing lens, a beam combiner, a micro-electromechanical assembly and a projection lens. The laser emitter emits trichromatic laser signals, which are irradiated into the beam combiner via the focusing lens. The beam combiner converges the trichromatic laser signals into a convergent laser signal and emits it to the micro-electromechanical assembly. The micro-electromechanical assembly scans the received convergent laser signal to generate a content to be displayed. In the above laser beam scanning display device, the content to be displayed, which is generated by the micro-electromechanical assembly, is displayed on the screen via the projection lens, which dispenses with any laser signal reflecting or transmitting means, thus reducing the volume of the device.
G02B 7/04 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
The present invention discloses a camera color adjusting method and apparatus. The method comprises: acquiring a stored proportion coefficient of an image sensor of a camera under a light source to be tested; controlling the camera to shoot test drawings including color blocks under a predefined light source to obtain test photos under the predefined light source; acquiring RGB values of each color block in the test photos under the predefined light source; generating test photos corresponding to the light source to be tested according to the RGB values of each color block and the proportion coefficient under each light source to be tested; and performing color adjustment for the camera according to all the test photos.
A wide-angle camera for a head-mounted device, includes, but is not limited to, a casing, a biconvex plus lens, and a biconcave minus lens. The biconvex plus lens and the biconcave minus lens are arranged in parallel in the casing and the biconcave minus lens is closer to an object space. The bioconcave minus lens is able to move along an axis of the casing to adjust a distance to the bioconvex plus lens. The focal power of a zooming system of the wide-angle camera is set to be a range from −0.005 to 0.005, an thus the bioconvex plus lens is stationary in the camera, and a movement of the bioconcave minus lens enables the camera to be suitable for the crowds of 500 degree nearsightedness to 500 degree farsightedness.
G02B 7/04 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
G02B 13/18 - Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
G02C 3/02 - Arrangements for supporting by headgear
A method for measuring lens distortion, comprising: providing a test card having a dot matrix pattern of K×N dots, wherein the K and the N are both positive integer; obtaining a distorted image of the test card after being distorted by a lens; establishing a planar coordinate system for the distorted image by using a dot at an upper left corner of the distorted image as a coordinate origin, a rightward direction from the origin as a positive direction of axis X, and a downward direction from the origin as a positive direction of axis Y; positioning a center dot of the distorted image and all non-center dots by scanning and searching, and determining coordinate values of the center dot and all the non-center dots in the planar coordinate system; and calculating a distortion amount of the distorted image by using the coordinate values of the center dot and all the non-center dots according to a distortion amount calculation equation for the distorted image, thereby obtaining a distortion amount of the lens. Also disclosed is a system for measuring lens distortion. The measurement method and system accelerates the image processing speed and improves the lens distortion measurement accuracy.
A method for measuring lens distortion, comprising: providing a test card having a dot matrix pattern of K×N dots, wherein the K and the N are both natural numbers (110); obtaining a distorted image of the test card after being distorted by a lens (120); establishing a planar coordinate system for the distorted image by using a dot at an upper left corner of the distorted image as a coordinate origin, a rightward direction from the origin as a positive direction of axis X, and a downward direction from the origin as a positive direction of axis Y (130); positioning a center dot of the distorted image and all non-center dots by scanning and searching, and determining coordinate values of the center dot and all the non-center dots in the planar coordinate system (140); and calculating a distortion amount of the distorted image by using the coordinate values of the center dot and all the non-center dots according to a distortion amount calculation equation for the distorted image, thereby obtaining a distortion amount of the lens (150). Also disclosed is a system for measuring lens distortion. The measurement method and system accelerates the image processing speed and improves the lens distortion measurement accuracy.
A chromatic-difference-free wide-angle camera for a head-mounted device, comprising a casing, a biconvex plus lens (1), and a biconcave minus lens (2). The biconvex plus lens (1) and the biconcave minus lens (2) are arranged in parallel in the casing and the biconcave minus lens (2) is closer to an object space. The biconvex plus lens (1) comprises a first surface (3) that is convex toward the object space, and a second surface (4) that has a flat edge and a center position that is convex toward an image space. The biconcave minus lens (2) comprises a third surface (5) that is concave toward the object space, and a fourth surface (6) that has a flat edge and a center position that is concave toward the image space. The biconcave minus lens (2) can move along an axis of the casing to adjust a distance to the biconvex plus lens (1), and compensate for a defocus in a zooming manner. The head-mounted device is suitable for being used with naked eyes by persons having −500 degree nearsightedness to 500 degree farsightedness. In use, a user can adjust the focal length according to his degree of nearsightedness or farsightedness to achieve a clear imaging without changing the conjugated distance between the human eyes and the screen.
G02B 9/16 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having three components only arranged + – + all the components being simple
G02C 7/06 - LensesLens systems bifocalLensesLens systems multifocal
G02B 13/18 - Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
G02B 13/00 - Optical objectives specially designed for the purposes specified below
An optical system of the zoom lens comprises 20 pieces of lens whose surfaces are spherical surfaces and which are made of glass, and a fixed diaphragm. In the zoom lens, a front fixed group with a positive focal power, a zooming group with a negative focal power, a compensating group with a positive focal power, and a rear fixed group with a positive focal power are formed sequentially along a light incidence direction. Through reasonably arranging each element and selecting a proper material, the requirements of optical index of 50 times zooming ratio under focal distance of 750 mm to 15 mm and long focal distance of 350 mm are achieved, and this zoom lens can be used for confocal imaging in a visible light wave band and a near infrared wave band, so that it is applied in a day-and-night monitoring system.
G02B 27/00 - Optical systems or apparatus not provided for by any of the groups ,
G02B 15/173 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged + – +
The present invention provides a virtual conferencing system including a wearable information device to be worn by a user; an environmental information capturing device that captures environmental information; a virtual simulation device that receives the environmental information captured by the environmental information capturing device, calculates simulation conferencing scenes by an intelligence algorithm, and transmits the simulation conferencing scenes to the wearable information device as the user's feedbacks.
patents