1464 results about "Chromatic aberration" patented technology

The invention discloses a columnar transparent part defect detection method, and relates to the technical field of optical detection and machine vision, and the detection method comprises a detection preparation stage, a detection pose configuration stage, a structured light stripe excitation stage, a machine vision detection stage, a model optimization evaluation stage, and a detection post-processing stage. According to the defect detection method for the columnar transparent part, the comprehensive performance of defect detection of the columnar transparent part is remarkably improved through the synergistic effect of coaxial pose optimization, composite structure light source design and improved YOLOv8 deep learning model; various common surface and subsurface defects in production are covered; the real-time detection requirement of an industrial production line is met through relative movement of the part and the light source and high-speed image acquisition and processing; the system has strong anti-interference capability, and can adapt to detection scenes of different materials, sizes and environmental conditions.

The invention discloses a wafer detection scattered light collection objective lens, and relates to the technical field of optical imaging. The scattered light collecting lens is applied to wafer defect detection, the scattered light collecting lens sequentially comprises a first lens group, a second lens group, a third lens group and a fourth lens group from an object plane to an image plane in the optical axis direction of the lens, twelve lenses and an aperture diaphragm, and the twelve lenses and the aperture diaphragm are coaxially arranged; the first lens group is a catadioptric lens group, has positive focal power, and is used for imaging an object plane to an intermediate image plane through two times of reflection. The numerical aperture of the acquisition objective lens provided by the invention is equal to 0.9, the field of view is equal to 2.6 mm, the acquisition objective lens has the characteristics of large field of view, large numerical aperture and small center shielding, the capability of detecting scattered light of defects can be greatly improved, chromatic aberration is corrected by adopting a refraction and reflection mode, and a wider laser bandwidth can be realized compared with a general refraction mode of combining CaF2 and fused quartz.

The invention discloses a pork quality grade lossless evaluation method based on hyperspectral imaging, and relates to the technical field of pork detection.The pork quality grade lossless evaluation method comprises the following steps that pork samples of different qualities are prepared, and standardization processing is conducted on the pork samples; performing chromatic aberration analysis on the pork samples with different qualities by using a colorimeter, and performing quality grade division on the pork samples with different qualities based on the analysis results of the muscle color, the fat color and the gloss of the pork. According to the pork quality grade lossless evaluation method based on hyperspectral imaging, reflection or transmission information of a pork sample in a plurality of continuous spectral wavebands is captured by using a hyperspectral imaging technology, accurate evaluation of the pork quality grade is realized by analyzing spectral data, higher-dimension data is provided, and the evaluation accuracy of the pork quality grade is improved. Meanwhile, rapid scanning can be achieved, the detection time is greatly shortened, the overall detection efficiency is improved, and pork quality monitoring is more efficient and timely.

The invention discloses a titanium dioxide super-lens large-view-field achromatic imaging method and device, and the method comprises the steps: building a simulation model through a time domain finite difference method, and obtaining the phase amplitude corresponding relation of TiO2 nano-column units under different sizes; and according to a first target function preset by single-wavelength super-diffraction focusing, reversely designing and iteratively optimizing the surface phase of the TiO2 super-lens by using a genetic algorithm to obtain the single-wavelength super-diffraction super-lens. And then, optimizing the genetic algorithm, and reversely designing and optimizing the phase of the single-wavelength super-diffraction super-lens again in combination with a Rayleigh-Sommerfeld diffraction formula and a second target function preset by broadband achromatism to obtain the broadband achromatism super-diffraction super-lens. And finally, point spread functions with different off-axis degrees are optimized by means of an exhaustion algorithm and an angular spectrum theory, and large-view-field achromatic super-diffraction imaging is realized. The invention effectively solves the problems of large aberration, obvious chromatic aberration, limited resolution, difficulty in parameter regulation and control and poor off-axis imaging performance of the traditional optical lens and the existing super lens in large-view-field imaging.

The invention discloses a chromatic aberration correction method, head-mounted display equipment and a computer readable storage medium, and the chromatic aberration correction method is applied to the head-mounted display equipment, and comprises the steps: inputting the sampling point information of each pixel in a to-be-displayed image into a pre-constructed target offset model, obtaining first position offset information of a to-be-corrected channel corresponding to each piece of pixel sampling point information; according to the first position offset information of the to-be-corrected channel corresponding to each pixel sampling point information, in combination with an interpolation method, performing interpolation to obtain second position offset information of the to-be-corrected channel corresponding to each pixel point on the to-be-displayed image; according to the second position offset information, an edge color-edge area of the screen is determined, brightness attenuation processing is conducted on the edge color-edge area, and the edge color-edge area refers to a color-edge area formed outside a calibrated target display area corresponding to the screen display frame. According to the method and the device, the transverse chromatic aberration can be corrected in real time with relatively low hardware complexity and operation load.

The invention discloses an industrial lens with a large target surface, low distortion and low chromatic aberration. An optical system of the industrial lens is composed of a meniscus positive lens L1, a meniscus negative lens L2, a biconcave negative lens L3, a positive lens L4, a diaphragm C, a positive lens L5, a biconvex positive lens L6, a biconcave negative lens L7, a biconvex positive lens L8, a biconvex positive lens L9, a biconcave negative lens L10, a biconvex positive lens L11 and an image plane IMG which are sequentially arranged along an incident light path, and the object side face of the meniscus positive lens L1 is a convex face; the object side surface of the meniscus negative lens L2 is a convex surface; the biconvex positive lens L6 and the biconcave negative lens L7 form a first gluing group; and the biconvex positive lens L9 and the biconcave negative lens L10 form a second gluing group. The industrial lens has the advantages of small size, large target surface, low distortion, low chromatic aberration and high resolution.

The invention relates to the technical field of color measurement, in particular to a color measurement method based on hyperspectral imaging, which comprises the following steps: judging whether the chromatic aberration of a to-be-measured sample needs to be calculated or not, and if the chromatic aberration of the to-be-measured sample needs to be calculated, presetting a standard color value, and acquiring dark background hyperspectral data of the to-be-measured sample based on a hyperspectral imaging device, otherwise, directly acquiring the dark background hyperspectral data of the to-be-measured sample based on the hyperspectral imaging device. According to the method, the dark background hyperspectral data, the reflectivity calibration plate data and the real-time hyperspectral data of the sample are collected and corrected, so that the color measurement precision can be remarkably improved, the interference of an ambient light source and equipment noise is eliminated, the finally obtained standard real-time hyperspectral data is ensured to reflect the real spectral characteristics of the sample to be measured, and the accuracy of color measurement is improved. And the corrected standard real-time hyperspectral data can more accurately reflect the reflectivity spectrum of the sample to be detected, so that the calculation of the color value is more accurate.

The utility model provides a rotary mop convenient for observing the spin-drying state, which comprises a rotary mop and a mop bucket, the rotary mop and the mop bucket are combined for use during spin-drying, the rotary mop comprises a mop head and a mop rod, the mop head comprises a mop plate and a mop plate cover arranged above the mop plate, a chromatic aberration switching mechanism is arranged in the mop head, and the chromatic aberration switching mechanism is connected with the mop rod. The chromatic aberration switching mechanism comprises a movable seat capable of sliding / swinging relative to the mop head, a movable block connected with the movable seat and a chromatic aberration feedback part arranged on the mop head, and the movable block slides / swings towards the chromatic aberration feedback part through a movable path, so that the movable block is arranged above the chromatic aberration feedback part; when the mop head rotates at a high speed to throw water, the movable block slides towards the chromatic aberration feedback part or the movable block slides away from the chromatic aberration feedback part, so that the movable block is arranged above or away from the chromatic aberration feedback part, and when the mop head rotates at a high speed to throw water, the movable block slides correspondingly, so that a user directly observes the use state of the rotary mop.

To improve designability when a light source is turned on / off.SOLUTION: An exterior component for a vehicle includes a light source 81, and a decorative body part arranged on a vehicle outside (front side) of the light source 81. The decorative body part includes decorative layers 60 between an inner base material and an outer base material composed of transparent materials. The decorative layer 60 includes a first colored layer 61 which is formed of a color pigment and has light permeability, and a second colored layer 62 which is stacked on a vehicle inside of the first colored layer 61, has a filler 65 dispersed in a coating material, and has light permeability. The filler 65 includes a filler body 66, and a film 68 coating the filler body 66. The film 68 is formed of a color pigment having a color difference ΔE between the color pigment of the first colored layer 61 and the color pigment of 30 or less.SELECTED DRAWING: Figure 5

The invention provides a low-chromatic-aberration transparent display device in order to solve the problem that chromatic aberration easily occurs in polarization modulation stereoscopic display adopting a 1 / 4 wave plate. The low-color-difference transparent display device comprises a directional polarization light source, a reflector and a transparent liquid crystal display panel. The pixels on the upper portion of the 2D display panel are lightened in a time-division multiplexing mode and any time slice slot, light rays of the pixels are projected through the lens array and then reflected through the reflector, the polarization direction of the light rays is adjusted, and then the light rays penetrate through the transparent liquid crystal display panel to form viewpoints. The transparent liquid crystal display panel synchronously provides a parallax image corresponding to the viewpoint position. The sub-pixel value of any one lightened pixel on the 2D display panel is modulated to be a fixed value related to the included angle of the lens, so that colored light generated by the pixel is restored to be white light after being polarized by the polarizer, the polarization direction is adjusted by the 1 / 4 wave plate and the polarization of the analyzer. At the moment, a directional light source without chromatic aberration is provided for the transparent liquid crystal display panel, so that chromatic aberration introduced by the polaroid and the wave plate is reduced.

The invention discloses a four-channel fluorescence detection light path module of a super-resolution biological microscope, which divides a fluorescence signal of an intermediate image plane (5) into four conjugate channels (7a-7d) through multi-stage dichroscope light splitting, reflector guiding and lens focal plane adjustment on the premise of not introducing additional aberration, and realizes real-time synchronous detection by using a single large-target-surface camera (8). By adjusting the distance between the reflectors, the inclination angle of the parallel plate glass or the position of the lens, the device can adapt to different camera target surface sizes and compensate chromatic aberration, and the problems of motor switching delay and dual-channel aberration in the prior art are solved.

The invention provides a voxel and image feature fused three-dimensional vehicle target detection method and system. The method comprises the steps of obtaining an initial laser radar point cloud and an initial scene image of a sample detection scene; performing data enhancement on the laser radar point cloud and the initial scene image by using a cross-modal real frame data enhancement method to obtain an enhanced laser radar point cloud and an enhanced scene image; performing chromatic aberration balance on the enhanced scene image to obtain a balanced scene image; performing image conversion on the balanced scene image to obtain a converted scene image; inputting the enhanced laser radar point cloud and the converted scene image into the initial target detection model to obtain a trained three-dimensional vehicle target detection model; and inputting to-be-detected data of the target detection scene into the three-dimensional vehicle target detection model to obtain a detection result. According to the invention, accurate and rapid identification of the three-dimensional vehicle target can be realized.

The utility model relates to an ultra-wide-angle lens suitable for a front binocular camera module. An optical system is composed of a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged along the incident direction of light, and the fourth lens and the fifth lens are glued to form a glued lens group. The imaging angle of the camera lens to an object is larger than 120 degrees, meanwhile, the camera lens has the advantages of being high in imaging definition, large in clear aperture, low in tolerance sensitivity, good in high-temperature and low-temperature stability and the like, meanwhile, scenes in front of a vehicle can be monitored more comprehensively, and through reasonable matching of all the optical lenses, the system is compact and reasonable in structure, and the system is convenient to use. The imaging system is simple in structure, low in cost, easy to assemble, low in tolerance sensitivity and more suitable for large-scale high-yield production, the overall size is reduced, axial chromatic aberration, vertical-axis chromatic aberration and high-order chromatic aberration are corrected, and it is guaranteed that the imaging system can have high imaging quality even at a large angle.

The invention discloses an online coated glass color difference detection method, and relates to the technical field of glass color difference detection. The on-line coated glass color difference detection method comprises the following steps: step 1, conveying coated glass to the position of a detection mechanism through a first conveyor belt mechanism, and after the coated glass reaches the position below the detection mechanism, moving the detection mechanism and detecting the color difference of the coated glass in the whole area in a sweeping manner; 2, judging a color difference detection result to obtain whether the detection result is qualified or unqualified; 3, the detected coated glass enters a second conveying belt mechanism and is conveyed by the second conveying belt mechanism; 4, if the color of the coated glass subjected to color difference inspection is unqualified, the coated glass is separated from the second conveying belt mechanism in a lifting mode on the second conveying belt mechanism; according to the online coated glass color difference detection method, unqualified glass is removed in a lifting manner, so that the coated glass is prevented from being broken.

The invention relates to the technical field of artificial intelligence, and discloses a vision-guided automatic sorting and deviation rectifying method and system.The vision-guided automatic sorting and deviation rectifying system comprises a vision parameter processing module, a sorting strategy decision module and a deviation rectifying execution control module, a real-time judgment mechanism of dynamic and static resolution differences is established by setting a resolution collaborative correction end, and the deviation rectifying execution control module is established; a self-adaptive interpolation algorithm is adopted to adjust visual feature data, so that the system can eliminate imaging resolution deviation caused by ambient light and transmission vibration, the acquisition accuracy of material surface texture features is ensured, sorting identification errors caused by projection chromatic aberration are avoided, the environmental adaptability of the visual guidance system is improved, and the visual guidance system is more accurate in image quality. The position and posture coupling analysis end is arranged, the dynamic matching degree of the position and posture offset of the materials and the motion trail of the mechanical arm is monitored in real time, the grabbing angle offset is automatically corrected through a space coordinate compensation mechanism, and it is guaranteed that the relative space position of an end effector and the materials is in the optimal grabbing state all the time.

The invention provides probe type mineral multi-element laser-induced breakdown spectroscopy detection equipment. The equipment is characterized in that a sealed quartz optical window is mounted on the side surface of a probe box; the laser faces the sealed quartz optical window and emits laser pulses to the detected mineral; the convex surface of the quartz crescent focusing lens faces the laser, the concave surface of the quartz crescent focusing lens faces the sealed quartz optical window, and laser pulses are focused on the surface of detected mineral to generate plasma; the dichroscope is used for reflecting the plasma emission light to the double-lens group; the emitted light is converged through the double-lens group to form a plasma image with weakened chromatic aberration; the spectrograph is coupled with the plasma image through an optical fiber mechanism and records spectrums of different wavebands; therefore, after the focus point of the reflected light of the crescent focusing lens is pushed far to the laser, the optical element is prevented from being damaged; the imaging chromatic aberration of a plasma image is reduced by the double-lens group; the optical fiber mechanism balances spectral intensities of different wavebands and suppresses a continuous spectrum through spatial resolution.

The invention discloses a head reconstruction method based on a single photo, and the method employs a high-low model mesh fusion algorithm to guarantee the facial details, achieves the model lightweight, and guarantees that the model can adapt to a mobile device and meet the real-time rendering demands. Through combination of key point detection and a PnP algorithm, accurate projection and extraction of facial textures are realized, and the fidelity of texture details is effectively improved. Besides, a skin color matching method based on a Lab color space is introduced, the problem of chromatic aberration between the face area and the prefabricated chartlet is solved, natural edge transition and vivid visual effect are ensured, and therefore a high-quality head three-dimensional model meeting the requirements of multiple platforms and multiple scenes is generated.

The invention relates to the technical field of optical instruments, and discloses a visible-ultraviolet dual-wavelength microscope objective and an optical system.The visible-ultraviolet dual-wavelength microscope objective comprises a first lens set with positive focal power and a second lens set with negative focal power which are sequentially arranged from the object plane to the image plane of the microscope objective in the optical axis direction of the microscope objective; the second lens group comprises a front group with negative focal power, a middle group with positive focal power and a rear group with positive focal power; the microscope objective also comprises an aperture diaphragm; the aperture diaphragm is positioned between the two adjacent lenses in the middle group; according to the microscope objective, through reasonable matching of the positive focal power and the negative focal power, the influence of chromatic aberration under a wide-spectrum light source is effectively reduced, the high numerical aperture and the large view field characteristic are kept, and the microscope objective can adapt to the wide-spectrum ultraviolet laser wavelength.

A system for chromatic aberration and geometry calibration and validation of VR HMDs has a left eye display and a right eye display, comprises a measurement device with a left (11) and a right (12) camera. A control unit, connected to the two cameras, is configured to deliver control signals to the HMD when attached to the measurement device and with the camera IPD is equal to the HMD IPD and a virtual IPD, the control unit is configured to effect a measurement comprising the steps of: creating a virtual target object having am image center identifying element (523) for each camera (11, 12) and a plurality of predetermined points (525) within the FOV of the cameras, calculating and transmitting the images of said virtual target object to the displays of the HMD, taking the images of the displays with the cameras, detecting the virtual object (535) within the images, determining the shift (555) for the plurality of predetermined points (525) of the virtual object, for creating a chromatic aberration heatmap and a subsequent chromatic aberration validation, or for calculating the distortion of the predetermined points within the FOV of the cameras for creating a geometric correction mapping for the HMD for a geometry calibration of the HMD; or for using the shift for creating a heatmap for the HMD and determining the geometry validation or denying the geometry validation.

The invention relates to the technical field of color printing product quality detection, and discloses a green color printing product defect intelligent diagnosis method based on deep learning. Visible light, hyperspectral and infrared thermal imaging data of a green color printing product are collected, multi-scale feature extraction is carried out, defect feature vectors such as surface texture, chromatic aberration distribution and heat conduction abnormity are obtained, and a cross-modal attention mechanism is utilized to fuse the defect feature vectors into a unified defect representation vector. And determining a defect type and a repair scheme through a dynamic classification algorithm in combination with the defect knowledge base. The algorithm comprises the steps of generating an initial candidate defect set, constructing a topological graph, optimizing defect type judgment and the like. A multi-dimensional anomaly detection model is adopted to process sudden defects, and a causal inference engine is utilized to adaptively adjust a repair scheme. And constructing a defect rule knowledge graph to verify the compliance of the repair scheme. The method is accurate in detection, intelligent in diagnosis and efficient in repair, and effectively improves the quality detection and repair level of the green color printing product.

An optical alignment method includes providing an emitted radiation beam which includes a first peak wavelength and a second peak wavelength to a chromatic aberration enhancement component which increases a chromatic aberration of the emitted radiation beam, providing a first incident radiation beam having the first peak wavelength and a second incident radiation beam having the second peak wavelength which is shorter than the first peak wavelength to respective first and second alignment marks located at different vertical levels in a device under test, detecting reflected radiation from the first and second alignment marks, and using the detected reflected radiation for optical alignment of layers in the device under test.

The invention relates to a three-waveband off-axis reflective optical system with view field switching and focusing functions. Belongs to the photoelectric technical field. Multi-band common-caliber imaging is realized by adopting an off-axis two-reflection-path form, imaging information can be continuously obtained day and night all day, laser emitting and receiving capabilities are considered, and the device has functions of positioning aiming, laser guiding and the like. Large and small field-of-view switching imaging is realized through switching-in and switching-out of the secondary mirror, and the system has the capability of carrying out rapid search in a large field-of-view range and carrying out accurate identification and tracking in a small field-of-view range; the auto-collimation focusing of the optical system is realized by switching the position of the focusing mirror and arranging the focusing system, the system is ensured to be clear in imaging under the use conditions of different atmospheric pressures, temperature changes and photographing distances, and the system is suitable for accurate aiming and detection of a target under various complex and severe working conditions. The total reflection optical system is free of chromatic aberration, free of blocking, compact in structure and high in system integration degree, and the requirement for functional diversification of a photoelectric system is met.

The application discloses a multi-marked endoscopic imaging lens for digestive tract, and belongs to the field of biomedical microscopic endoscopic imaging. The endoscopic imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens; the first lens focuses laser; the second lens is matched with the first lens to limit a light beam in an effective light aperture of the lens; the third lens corrects chromatic aberration; the fourth lens and the fifth lens are combined to correct aberration; the sixth lens adopts an aspheric lens to correct spherical aberration caused in a collimating and focusing system; and the seventh lens is matched with the sixth lens to correct chromatic aberration. The working spectral range of the microscopic objective lens group is 488-860 nm, the effective light aperture is less than 1.8 mm, the mechanical outer diameter is not greater than 2.6 mm, the numerical aperture at the object side or the tissue is 0.55, the imaging field of view is 450 microns, the magnification is 2.14 times, and the working distance is 84 microns. The effect of matching excitation and fluorescence spectrum of a clinically available fluorescence contrast agent is realized.

The invention discloses a compact waveguide collimation system and application thereof. The compact waveguide collimation system sequentially comprises a first lens group, a diaphragm, a second lens group, a prism equivalent lens, a window protection sheet and an image plane position along an optical axis. The first lens group is combined with the bonding lens through the double-layer positive-focal-power meniscus lens, so that aberration and chromatic aberration are effectively corrected; and the second lens group adopts a negative-focal-power biconcave lens for beam expansion and is combined with a symmetrical-structure lens, so that the aberration correction difficulty is reduced. The system completely adopts spherical mirrors and glass materials, realizes the characteristics of high collimation, high relative illumination, low distortion, compact structure and low cost by optimizing the focal power, the surface type and the relative position, and is suitable for an optical waveguide display system.

The invention relates to an optical lens with high efficiency and high central field-of-view image resolution. The optical lens comprises a first lens, a second lens, a third lens, a fourth lens and an image surface which are arranged in sequence, the surfaces of the first lens, the second lens and the third lens are aspheric surfaces, and the Abbe coefficient of the second lens is lower than that of the other three lenses; the first surface and the second surface of the second lens are bent towards one side far away from the image surface; the vignetting diaphragm is arranged on the first surface, far away from the image surface, of the fourth lens; and the aperture diaphragm is arranged on the first surface or the second surface of the first lens, and the distance between the aperture diaphragm and the vignetting diaphragm is 23-50 mm. The lighting efficiency is high; the surfaces of the first lens, the second lens and the third lens are aspheric surfaces, so that the transverse chromatic aberration is optimized, and the abbe coefficients of the other three lenses are higher than that of the second lens, so that the overall transverse chromatic aberration is reduced; by setting the distance between the aperture diaphragm and the vignetting diaphragm, the imaging quality of the central view field can be improved.

The invention relates to a multi-spectral wavefront aberration restoration method and system based on double roof prisms, and the method comprises the following steps: taking a sub-pupil image as the input of a classification model, obtaining classification feature data, and carrying out the data expansion of the classification feature data, the sub pupil image is obtained by inputting incident wavefront aberration into a simulation light path of the double-ridge prism wavefront sensor, the double-ridge prism wavefront sensor comprises two groups of double-ridge prisms, each group of double-ridge prisms comprises two ridge prisms which are vertically and oppositely arranged, the characteristics of the ridge prisms are equal, and the characteristics of the double-ridge prisms are equal. The two groups of double-roof prisms are made of a material combination for eliminating chromatic aberration; splicing the sub pupil images and the classification feature data after data expansion to serve as input of a regression model, and obtaining a Zernike coefficient matrix corresponding to incident wavefront aberration; and according to the Zernike coefficient matrix corresponding to the incident wavefront aberration and the Zernike polynomial, obtaining a recovered wavefront aberration. Compared with the prior art, the method has the advantage that the wavefront aberration recovery accuracy is improved.

The invention discloses a multi-lens picture automatic splicing fusion processing method in video communication, which belongs to the technical field of multimedia communication, and comprises an acquisition module for synchronously acquiring video images of different visual angles through a plurality of cameras, and an analysis module for identifying overlapping areas and key feature points in each path of video, carrying out image matching, and sending the images to the video communication module. The fusion module is used for splicing and fusing the multiple paths of videos according to the image matching result to generate a panoramic picture, and the output module is used for outputting the spliced and fused panoramic picture to terminal equipment in real time. According to the invention, through a frame-level synchronization system with a unified time reference and standardized video parameter configuration, time sequence deviation and chromatic aberration distortion of multiple paths of videos are eliminated, the feature matching reliability in a complex scene is remarkably improved, the positioning precision of an overlapping region is ensured, splicing traces can be efficiently eliminated, and meanwhile, processing delay is reduced; and intelligent adaptation of the panoramic content on different terminal devices can be realized, and the degree of freedom of user control is improved.

The invention discloses a multi-wavelength high-color-difference metasurface color holographic device and a design method thereof.The method comprises the steps that firstly, a nano-column super unit is simulated and then serves as training data of a four-port neural network model, a well-trained forward prediction model is obtained, a prediction response database is constructed, and the prediction response database is used as a prediction result; and according to the phase demand of the target image, a corresponding unit structure is matched in the prediction response database, the multi-wavelength high-chromatic-aberration metasurface color holographic device is designed, and full-mode electromagnetic simulation is carried out. According to the scheme, when holographic imaging is achieved, the RGB energy efficiency is improved, and positive illumination high-efficiency metasurface color holographic imaging can be effectively achieved. The method belongs to a non-filtering type multi-wavelength high-color-difference metasurface color holographic device design method, information of three channels of red, green and blue is coded into sub-pixels at the same time, each sub-pixel responds to RGB light, and compared with a traditional mode that RGB sub-pixels respond respectively, the space utilization rate and energy efficiency of three primary colors are greatly improved.

The invention discloses a method for designing a myopia prevention and control lens based on harmonic diffraction. Relates to the technical field of eye vision optics, in particular to the technical field of a myopia prevention and control lens design method based on harmonic diffraction. According to the method, a harmonic diffractive optical lens chromatic aberration correction method and a harmonic diffractive optical lens diffraction efficiency calculation method when shielding is considered are firstly designed, chromatic aberration is effectively eliminated, the diffraction efficiency is evaluated, and then influences of chromatic aberration correction and shielding error manufacturing are balanced by designing a balance optimization model. The method comprises the following steps: designing a diffractive optical element on the refraction surface of a myopia prevention and control lens to obtain a refractive and diffractive optical lens; modulating the harmonic number # imgabs0 # of the refractive and diffractive optical lens to obtain a harmonic diffractive optical lens; designing a chromatic aberration correction method of the harmonic diffractive optical lens; harmonic diffractive optical lenses are designed that take into account additional refractive power and diffraction efficiency at the time of manufacturing shields.

The invention discloses a textile color difference detection method based on image data, and relates to the technical field of image processing and computer vision, and the method comprises the following steps: S1, collecting an image of a textile with a high reflection characteristic under a standard light source, constructing a light intensity prediction model, and carrying out the analysis based on pixel brightness distribution, identifying a brightness abrupt change region and a saturation critical region, and generating an image-level saturation risk probability graph; s2, performing multi-scale exposure area division on the image based on the image-level saturation risk probability graph, setting a target brightness range of each exposure control sub-area, and recording a global exposure parameter of the image acquisition equipment as an initial baseline of exposure scheduling; according to the method, pixel-level brightness convergence is realized through light intensity prediction and area exposure control, real color distribution is reconstructed in combination with color compensation, and a closed-loop process is constructed by introducing model self-correction, so that the detection precision and consistency of the micro chromatic aberration of the high-reflective fabric are improved, and the automation and industrial applicability are enhanced.