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Method to Eliminate Color Casting of Edge Pixels

An edge pixel and color cast technology, which is used in the field of sensors to eliminate the color cast problem of edge pixels at high temperature, can solve the problems of bright and purple visual effects, and image color cast, so as to improve the display effect, solve the problem of color cast, and eliminate the edge effect of transition

Active Publication Date: 2020-11-27
思特威(上海)电子科技股份有限公司
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Problems solved by technology

[0009] The blc dark current value calculated by the dark pixel array in the above formula is only a statistical average value, which is a small value compared with the dark current of pixels around the effective pixel array. The pixels around the array also contain a large dark current value, especially under high temperature conditions, which eventually leads to color cast around the image, and the visual effect is bright and purple

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  • Method to Eliminate Color Casting of Edge Pixels

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[0039] Black level (Black Level), also known as black level, reflects the gap between the black in the collected image and the standard color. Because there is a dark current in the photodiode output, it is equivalent to an error in the overall image. This error may make the black in the image whiter than the standard black, forming gray, thereby reducing the contrast of the image. In order to solve this problem , it is necessary to perform black level correction.

[0040] The traditional way to eliminate dark current is:

[0041] data_o=data_i+offset-blc (1)

[0042] The blc value of the above formula can be obtained by statistically calculating the average value of the dark pixel array (dark pixel), and the dark pixel array 2 is generally located above the effective pixel array 1, such as figure 1 shown. In order to improve the calculation speed of the blc value, the blc calculation process can be divided into virtual eight channels and virtual four channels, which are pr...

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Abstract

The invention provides a method for eliminating an edge pixel color cast problem. The method comprises the following steps: determining an edge pixel region of an effective pixel array; determining atransversal compensation value and a longitudinal compensation value of the edge pixel region; respectively determining a first compensation value at a corner part and a second compensation value at anon-corner part of the edge pixel region; performing compensation on an output value of the pixel in the edge pixel region according to the first compensation value and the second compensation value;taking the weight by the transversal compensation value and the longitudinal compensation value to obtain the first compensation value at the corner part by using a curve compensation algorithm at the corner part of the edge pixel region; performing the compensation on an output value of the pixel in the edge pixel region according to the first compensation value so as to compensate the dark current at the corner part. The edge transition phenomenon is eliminated, the cross stripes and the vertical stripes of an image are eliminated, the color cast problem around the image is solved, the display effect of the image is improved, and the sensor quality is improved.

Description

technical field [0001] The invention relates to the technical field of semiconductors, in particular to a method for eliminating the color cast problem of edge pixels under high temperature in a sensor. Background technique [0002] An image sensor refers to a device that converts optical signals into electrical signals. Image sensors include Charge Coupled Devices (CCD) and Complementary Metal Oxide Semiconductor (CMOS) image sensor chips. [0003] Compared with traditional CCD sensors, CMOS image sensors have the characteristics of low power consumption, low cost and compatibility with CMOS technology, so they are more and more widely used. Now CMOS image sensors are not only used in the field of consumer electronics, such as miniature digital cameras (DSC), mobile phone cameras, video cameras and digital single-lens reflex cameras (DSLR), but also in automotive electronics, monitoring, biotechnology and medical fields. [0004] The pixel unit of the CMOS image sensor is...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/361
Inventor 肖琨王豪杰徐辰
Owner 思特威(上海)电子科技股份有限公司
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