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Dark current correction method of CMOS image sensor

A dark current correction and image sensor technology, applied in the field of image processing, can solve the problems of power consumption difference of chip circuit and chip process deviation, and achieve the effect of high correction accuracy and excellent image effect.

Active Publication Date: 2020-07-17
CHENGDU LIGHT COLLECTOR TECH
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Problems solved by technology

Due to the deviation of the chip process, or the power consumption of the circuits around the chip is different

Method used

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  • Dark current correction method of CMOS image sensor
  • Dark current correction method of CMOS image sensor
  • Dark current correction method of CMOS image sensor

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Embodiment Construction

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] as attached image 3 As shown, a dark current correction method for a CMOS image sensor provided by the present invention is characterized in that it includes the following steps:

[0033] S01: Place the CMOS image sensor in a completely dark environment, set different exposure conditions, and obtain the dark current pixel value of the corresponding image; use one of the pixels in the pixel array as a reference point, and calculate the relative values ​​of the remaining pixels in the pixel array relative to the reference point Point the ratio of the dark current pixel value, and mark the corresponding ratio in the image to form a dark current network; according to different exposure conditions and their corresponding ...

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Abstract

The invention discloses a dark current correction method for a CMOS image sensor, and the method comprises the following steps: S01, enabling the CMOS image sensor to be placed in an all-black environment, setting different exposure conditions, and obtaining a dark current pixel value of a corresponding image; taking one pixel point in the pixel array as a reference point, calculating the proportion of the rest pixel points in the pixel array relative to the dark current pixel value of the reference point, and marking the corresponding proportion in the image to form a dark current network; S02, performing coarse correction on pixel points in the effective pixel array by adopting AFB in an analog signal processing module; and S03, calculating a dark current correction value AFB' of each pixel point in the effective pixel array through a digital algorithm in the dark current network, and performing accurate correction on the pixel value of the effective pixel array by adopting the AFB 'in the digital signal processing module. According to the dark current correction method of the CMOS image sensor, the dark current correction precision is high, and the correction result better conforms to the actual application situation.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a dark current correction method of a CMOS image sensor. Background technique [0002] In the process of image processing, the image collected by the CCD / CMOS image sensor is usually processed. However, when a CMOS image sensor is used to collect images, even if the pixels of the image sensor manufactured by the CMOS process are not exposed, the output of the ADC is not zero due to the existence of dark current, resulting in an image that does not appear absolutely black in the case of complete shading. . The output level of the image sensor in a completely dark environment is called dark current. Dark current will affect the color reproduction, dynamic range and clarity of the image and needs to be corrected to eliminate it. [0003] The magnitude of the dark current has a linear relationship with the exposure time and an exponential relationship with the temperature. Every t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/217H04N5/374H04N5/361H04N5/369
CPCH04N25/63H04N25/633H04N25/76
Inventor 宋博喻义淞温建新王勇
Owner CHENGDU LIGHT COLLECTOR TECH
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