9 results about "Black level" patented technology

The present invention provides a photoelectric converter capable of performing appropriate black level correction even when processing pixel signals using multiple different gain settings. [Solution] The photoelectric converter includes a pixel that outputs an analog reference signal and an analog image signal; a readout unit that outputs a digital reference signal that has undergone gain processing and AD conversion processing on the analog reference signal and a digital image signal that has undergone AD conversion processing and gain processing with a first gain or a second gain on the analog image signal; and a difference processing unit that outputs a first value, which is a value generated by difference processing between the digital image signal and the digital reference signal, when the analog image signal has undergone gain processing with a first gain or the digital signal value, which is the value of the digital reference signal, is less than a first determination value, and outputs a second value, which is different from the value generated by difference processing, when the analog image signal has undergone gain processing with a second gain and the digital signal value is equal to or greater than the first determination value.

The present application provides a kind of image sensor with black level compensation function, comprising: for generating analog image signal pixel main array;Active pixel array in the pixel main array, imaging lens focuses incident light on the active pixel array;Four corner pixel subarrays, each corner pixel subarray is located in one of the four corners of the active pixel array, opaque shield is above its photodiode to prevent the generation of charge related to incident light, these corner pixel subarrays provide black level compensation analog image signal;Analog-to-digital converter circuit and black level compensation circuit, black level compensation circuit compensates the black level variation between the pixels of the active pixel array by algorithm.The present application adopts black level compensation method to solve the image shadow of image sensor caused by various factors.The present application also provides an image sensor black level compensation method.

This invention relates to the field of image processing technology, specifically to an automatic color correction method for microscope images. The method includes: extracting the background component of a metallographic sample image sequence to fit a predicted illumination field; constructing a thermal stability compensation model that correlates power-on time with real-time temperature; and performing level reference subtraction on the original image to eliminate black level drift. A constrained normalized division is performed on the initial correction image using the illumination field to obtain an intrinsic reflectance image. Color shift correction is achieved by statistically analyzing the histograms of the red, green, and blue channels and identifying the matrix's main peak, using the mean of its central pixel value as a reference for gain scaling. Finally, a piecewise nonlinear mapping transformation is performed based on the local maxima of different metal phases, followed by slope smoothing. This invention solves the color distortion problem caused by the coupling of uneven illumination and thermal drift in microscopic imaging, effectively improving the fidelity and contrast of metallographic images, and is applicable to the field of automated metallographic analysis.

The invention provides an image sensor, an electronic device and a method, the image sensor comprises a pixel, a comparator, a digital-to-analog converter, a digital processing circuit, a correction module and a first controller, the first controller is used for responding to a received black level correction signal output by the digital processing circuit and controlling the correction module to output a correction signal, a first signal output by the digital-to-analog converter is combined with the correction signal and then is output to a first input end of the comparator; the correction signal is a decimal multiple of the first signal. Therefore, as the signals input to the comparator comprise the first signal and the correction signal, and the correction signal is decimal times of the first signal, the comparator can perform decimal bit correction on the black level, so that the digital processing circuit only needs to perform integer bit correction on the black level, and on the basis of realizing high-precision decimal bit correction, the correction efficiency of the black level is improved. And the operand and the power consumption increment of the digital processing circuit are reduced.

This invention relates to the field of image processing technology, specifically to a pixel processing method, apparatus, device, and storage medium for images. The method includes: receiving image data of an original image captured by a sensor; dividing the n pixels into a first set and a second set by detecting whether n first pixel values ​​are 0; determining a first virtual black level in the first set based on the first pixel values, the true black level, and the bit width; setting the black level of each pixel in the second set to a second virtual black level; and statistically obtaining n virtual black levels corresponding to the n pixels; cropping the n first pixel values ​​to obtain n second pixel values; and performing post-processing on the image using the n second pixel values ​​to obtain the original image. After virtual black level cropping, this method retains some pixel values ​​that are not 0, preserving smaller values, thereby retaining pixel color or detail in extremely dark areas and optimizing image contrast and detail.

An image sensor includes a substrate having first and second surfaces opposite to each other, an image pixel area, and a black level calibration (BLC) area adjacent to the image pixel area. The BLC area includes a dark current sensing circuit including photo diodes disposed in the substrate, a first seal ring disposed over the second surface and surrounding the image pixel area in plan view, a second seal ring disposed over the second surface and surrounding the image pixel area in plan view such that the dark current sensing circuit is disposed between the first and second seal rings, an opaque cover disposed over the first surface and covering the dark current sensing circuit, the first and second seal rings, and one or more first trench isolation structures extending from the first surface to an inside the substrate and disposed between the first seal ring and the opaque cover.

This application relates to the field of image processing technology, and further to a method and apparatus for local black level calibration, a computer-readable storage medium, and a computer program product. The method includes: performing temporal accumulation on multiple acquired original images to determine a target image; determining effective pixels of the target image based on the median and standard deviation of multiple target pixels and the mean of each pixel in the target image; determining normalized weights for all effective pixels based on the mask and variance of all effective pixels; determining mesh nodes based on the normalized weights of all effective pixels, the mean of each pixel in the target image, the sampling interpolation matrix, and the regularization coefficient; and performing local black level calibration on the multiple original images based on the mesh nodes. This method significantly eliminates spatial distribution noise from the image sensor and improves image quality.

An image processing device includes a memory and a processor configured to calculate a reference black level and a reference illumination light component based on pixel values of peripheral pixels located around a target pixel for image processing using image data acquired by an imaging device, correct a black level of the target pixels based on the reference black level calculated by the processor, and perform a tone correction of the target pixels with the black level corrected based on the reference illumination light component calculated by the processor. Accordingly, even when a large gain is applied to a dark portion of an image in a local tone correction, it is possible to generate an image with high visibility in which an occurrence of raised black levels is suppressed.

The application provides a display panel and a spliced display module. The display panel comprises a substrate, a transparent cover plate, a filling part and a plurality of light emitting chips. The plurality of light emitting chips and the filling part are located between the substrate and the transparent cover plate. The filling part comprises a first filling part and a second filling part. The first filling part is located on the side of the light emitting chip away from the substrate. The second filling part is located between two adjacent light emitting chips. The first filling part is transparent or translucent to visible light, and the second filling part is translucent or opaque to visible light. The display panel and the spliced display module provided by the application can not only improve the transmittance of the display panel, but also ensure sufficient black level.