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CMOS Image Sensor Local Black Level Calibration Method

A technology of an image sensor and a calibration method, applied in the field of image processing, can solve the problems of brightening, blackening, and deviation in local areas, and achieve the effect of solving the brightening or blackening

Active Publication Date: 2021-06-29
思特威(上海)电子科技股份有限公司
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Problems solved by technology

This will cause the problem that some areas will be bright or black when the temperature rises, because the subtracted black level value deviates from the actual value

Method used

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  • CMOS Image Sensor Local Black Level Calibration Method

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specific Embodiment approach

[0027] The content proposed by the present invention will be described in detail below with reference to the accompanying drawings. figure 1 The basic flow chart of the local black level calibration method proposed by the present invention, combined with figure 2 The schematic diagram of image area division given in, the specific implementation of the present invention is as follows:

[0028] First, the image area is divided into M×N blocks (eg, M rows, N columns), as figure 2 As shown in the figure, the example in the figure is that each block of the image area is divided at equal distances, and the content of this embodiment is not limited to the specific implementation of dividing each block at equal distances. Taking an area block in the figure as an example, the intersection of the dividing lines of each block is set as the calibration point, and the initial calibration coefficient K(m,n) is set, where the value range of m is 0~M, and the value range of n is 0 to N. ...

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Abstract

The present invention provides a method for calibrating the local black level of a CMOS image sensor, the method comprising: dividing the image area into M×N blocks, setting the intersection of each block dividing line as a calibration point, and setting an initial calibration coefficient K(m,n); Obtain the black line data, calculate the mean value B of the black line, calculate the calibration coefficient curve A at different temperatures, and obtain the current calibration system K1; The points on the vertical line between the calibration points and the points in each block area calculate the corrected black level value Bnew; subtract the corrected black level value and output the calibrated pixel value. The method for calibrating the local black level of the CMOS image sensor provided by the present invention can effectively solve the problem that the value of the subtracted black level in the black level calibration process has a deviation when the temperature changes.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method for realizing local black level calibration of a CMOS image sensor. Background technique [0002] In a CMOS image sensor array, there are usually two parts: photosensitive pixels and light-shielding pixels. The photosensitive pixels collect image information, and the shading pixels (black lines) are mainly used for benchmark information calibration in image information processing. The image information output by the image sensor is usually the information collected by the photosensitive pixels minus the shading pixel information, that is, minus the black line pixel information, which is collectively referred to as black level calibration. [0003] Usually, the value collected in the black line of the CMOS image sensor and the value collected in the image line will change due to the influence of temperature, and due to the difference in distribution position, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/361H04N5/217H04N5/3745
CPCH04N25/63H04N25/77
Inventor 邵科王毫杰陆燕青
Owner 思特威(上海)电子科技股份有限公司
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