Black level correction method and device

A technology of black level correction and black level, which is applied in the field of image processing and can solve problems such as image color cast and flicker

Active Publication Date: 2020-11-20
CHENGDU LIGHT COLLECTOR TECH
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Problems solved by technology

[0005] The object of the present invention is to provide a black level correction method and device to solve the problem that t

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  • Black level correction method and device

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Embodiment Construction

[0066] A black level correction method and device proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will be more apparent from the following description. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

[0067] figure 1 A schematic flow chart of a black level correction method provided by an embodiment of the present invention, as shown in figure 1 As shown, the method may include:

[0068] Step 100: Obtain predetermined frame image data, and obtain a black level feedback value of the shading area of ​​the previous frame image data of the predetermined frame image data, the black level feedback value is used to indicate the reference black level of the shading...

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Abstract

The invention provides a black level correction method and device, and the method comprises the steps: obtaining preset frame image data, obtaining a black level feedback value of a shading region ofthe previous frame image data of the preset frame image data, wherein the black level feedback value is used for indicating a reference black level value of the shading region; calculating an error value between the pixel value of the shading area of the predetermined frame of image data and the black level feedback value of the shading area of the previous frame of image data; determining and storing a black level feedback value of the shading area of the predetermined frame image data based on the error value of the shading area of the predetermined frame image data; and performing black level correction on the effective pixel region of the predetermined frame image data based on the black level feedback value of the shading region of the predetermined frame image data. According to themethod, the phenomena of color cast and flickering can be avoided.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a black level correction method and device. Background technique [0002] In the process of image processing, it is usually necessary to correct the black level of the image collected by the image sensor. In the related art, the black level correction method mainly includes: firstly determine the black level value of the shading area based on the pixel value of the shading area of ​​each frame image as the reference black level value, and then use the effective value of the current frame image to The pixel value of each pixel in the pixel area is subtracted from the reference black level value of the shading area of ​​the current frame image to perform black level correction on the pixel value of the effective pixel area. [0003] However, in the related art, due to differences in the physical structure and process level of different color channels of the image sensor, coupled wi...

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Application Information

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IPC IPC(8): H04N5/361H04N5/217
CPCH04N23/81H04N25/63
Inventor 李想王勇温建新宋博
Owner CHENGDU LIGHT COLLECTOR TECH
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