The invention discloses a method and device for naked eye three-dimensional display crosstalk evaluation so as to improve the accuracy of the naked eye three-dimensional display crosstalk evaluation. The method comprises the following steps: a display panel is controlled to display N viewpoint images in sequence; when each viewpoint image is displayed, all sub pixels used for displaying the current viewpoint image display a white image, all sub pixels used for displaying the other viewpoint images display a black image, and first luminance values of light rays at all test angles corresponding to the current viewpoint image are obtained in sequence on the light emergence side of the display panel; the display panel is controlled to display an all-black image, and second luminance values of the light rays at all the test angles are obtained in sequence on the light emergence side of the display panel; according to any luminance peak value of the first luminance values and the second luminance value at the same test angle corresponding to the luminance peak value, the crosstalk value of the light ray at the test angle corresponding to the luminance peak value is determined, wherein the N is a positive integer not less than 2.

Method and device for naked eye three-dimensional display crosstalk evaluation

The invention discloses a test system and a test method for a signal-noise ratio of a low-light ICCD (Intensified Charge Coupled Device) and relates to the test system and the specific test method for the signal-noise ratio. The test method comprises the following steps of putting ICCD in a dark box, irradiating ICCD by using uniform light, applying working voltage to the ICCD and enabling the ICCD to work normally; adjusting a gradient wedge diaphragm and an aperture-variable diaphragm to change intensity of illumination, and collecting image signals of ICCD to obtain an average signal value and a noise root-mean-square value; calculating the signal-noise ratio value of ICCD through data processing. The test method can scientifically evaluate the noise characteristic of ICCD and can be widely applied to development and production of low-light devices.

Test system and test method for signal-noise ratio of low-light ICCD (Intensified Charge Coupled Device)

The invention discloses a method for determining nonuniform-brightness pixel points in a display screen. The method comprises the following steps: respectively obtaining the brightness value of each pixel point in an image output by the display screen to form an initial brightness matrix, and dividing the display screen into a plurality of pixel set areas; performing frequency domain filtering processing on the initial brightness matrix to obtain a background brightness matrix; and carrying out difference operation on the initial brightness matrix and the background brightness matrix, respectively counting pixel points with a difference between the initial brightness matrix and the background brightness matrix greater than zero and a quantity smaller than the difference and smaller than zero or pixel points with a difference smaller than zero ad a quantity smaller than the difference and greater than zero in each pixel set area to obtain the nonuniform-brightness pixel points in the display screen. According to the method for determining the nonuniform-brightness pixel points in the display screen, background influences are eliminated through subtraction of the background brightness matrix from the initial brightness matrix, and the nonuniform-brightness pixel points in the display screen can be quite accurately and directly obtained.

Method for determining nonuniform-brightness pixel points in display screen

The invention discloses a method for obtaining a panorama by using a code aperture camera. Distant-view panoramas that all parts are clear can be obtained by utilizing the method. The method comprises the following steps of: shooting a view by using the code aperture camera; calculating so as to obtain the sizes of point spread functions of points in shot images; clarifying the images by utilizing the corresponding relationship between the sizes and the depths of the point spread functions and utilizing a deconvolution algorithm; and splicing the clarified images so as to obtain the panorama. By utilizing the method, the splicing mistakes caused by shielding articles in the view are reduced when the images are spliced, and the problem of image blurring caused by the inconsistency of field depths in shooting when the panorama is spliced is avoided. According to the method, the code camera is adopted to acquire the view, so that the requirement on equipment is relatively low, and no extra depth acquiring equipment is used when obtaining an optimal panorama; and the method is simple and convenient in shooting process and easy to implement and popularize.

Method for obtaining panorama by using code aperture camera

The invention discloses a method for acquiring a gray-scale compensation value of a pixel and belongs to the technical field of display. According to the method, the size of a storage space in an Mura processing structure is reduced. The method for acquiring the gray-scale compensation value of the pixel comprises the following steps: acquiring a display area of a display panel; averagely dividing the display area into a plurality of first subareas according to a first preset rule, wherein each first subarea at least comprises two pixels; acquiring a prestored multinomial coefficient of each first subarea; constructing a multinomial corresponding to each first subarea according to a second preset rule; acquiring a preset value range for an independent variable of the multinomial, and acquiring the gray-scale compensation value of each first subarea according to the corresponding multinomial. The method disclosed by the invention can be used for display devices of a liquid crystal television, a liquid crystal display, a mobile phone, a tablet computer and the like.

Method for acquiring gray-scale compensation value of pixel

The invention discloses an online calibration system and an online calibration method for ununiformity of an LED (light-emitting diode) display screen. The online calibration system and the online calibration method mainly solve problems that an existing test method is only used for testing brightness uniformity, tested brightness uniformity index cannot reflect an overall performance of an LED display screen, and ununiformity calibration cannot be carried out according to tested data. The online calibration method includes steps of acquiring test images displayed by the LED display screen by a camera, and dividing LED lamp points by a method based on background prediction after noise is eliminated; repositioning luminous zones of the lamp points and component pixels of the luminous zones; and then mixing the lamp points to form colors of the pixels, and fitting acquired chromaticity coordinates of the lamp points to form a Gaussian curve after gross errors are eliminated, and solving a mean value of the chromaticity coordinates; substituting the mean value of the chromaticity coordinates into a uniformity evaluation formula to evaluate the uniformity; and finally generating a calibration matrix and performing online real-time online ununiformity calibration point by point. The online calibration method for the ununiformity of the LED display screen is high in precision and efficiency and good in stability, is simple, convenient and feasible, and is capable of being used for testing a uniformity display performance and ununiformity calibration for the LED display screen.

Online calibration system and online calibration method for ununiformity of LED (light-emitting diode) display screen

Method and system for testing performance indexes of naked-eye 3D (three dimension) display equipment

The invention discloses a super-resolution imaging system based on a compression coding aperture and an imaging method thereof, mainly solving a problem of expensive imaging cost in the prior art. The method comprises the following steps: designing a convolution template, and making a coding aperture according to coherence of a light source; placing the prepared coding aperture at a position of aperture diaphragm in an optical system and pressing a shutter for imaging, and obtaining a low resolution coding image; transmitting the coding image to a master control computer, decoding super-resolution to reconstruct a high-resolution image, and using a denoising algorithm to remove an artificial trace in the high-resolution image. The system and the method are characterized in that: restriction of a Nyquist criterion is broken through, low frequency sampling is carried out on a scene, the high-resolution image is obtained through super-resolution reconstruction, data waste caused by first sampling and second compression of a traditional imaging system is overcome, in sampling, data volume is compressed, imaging cost, compression cost and transmission cost are reduced, and the system and the method can be used for infrared imaging and remote sensing imaging technology.

Super-resolution imaging system based on compression coding aperture and imaging method thereof

The invention discloses a measurement system of performance parameters of a charge coupled device (CCD) chip, which mainly solves the weaknesses that the present system does not have universality, measures the parameters incompletely and has narrow spectral coverage. The entire system comprises an adjustable monochromatic light source system (1), an integrating sphere (4), a darkroom (5), a Dewar bottle temperature control chamber (9), a picoammeter (10), a main control circuit system (11) and a main control computer (14), wherein a CCD to be measured and a standard detector are arranged inside the Dewar bottle temperature control chamber, the adjustable single-color light source system outputs monochromatic light, the monochromatic light is radiated onto the CCD to be measured and the standard detector after being converted to homogenous light by the integrating sphere and the darkroom, the CCD to be measured is driven by the main control circuit to image, the output information of the CCD is uploaded onto the main control computer, and the main control computer calculates the performance parameters of the CCD to be measured according to the image information. The measurement system has advantages such as strong universality, complete measured parameters and high stability, and is suitable for the measurement of all CCD chips.

Measurement system of performance parameters of charge coupled device (CCD) chip

The invention discloses a method for measuring quantum efficiency and a responsivity parameter of a charge coupled device (CCD) chip, and mainly solves the problem of low measurement precision in the prior art. The method comprises the following steps of: selecting a series of wavelengths at equal intervals, setting a tunable wavelength monochromatic uniform light source system by using the wavelength values respectively, generating monochromatic light with the corresponding wavelengths, shooting image information according to requirements, uploading to a computer, selecting needed images by using matched computer software, calculating the mean gray value mu and the image variance sigma of the images, calculating a gain K of a control circuit respectively according to the calculated values, and calculating the quantum efficiency eta and the responsivity R according to the mean gray value mu, the image variance sigma and the gain K. The method for measuring the quantum efficiency and the responsivity parameter of the CCD chip has the advantages of high precision and high stability in parameter measurement and is suitable for the precise measurement of the quantum efficiency and the responsivity parameter of the CCD chip.

Method for measuring quantum efficiency and responsivity parameter of charge coupled device (CCD) chip

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