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Color shading correction method and device

A shadow correction and color technology, applied in the field of image processing, can solve the problems of not one-to-one correspondence, rough color consistency model, inaccurate color shadow correction, etc., and achieve the effect of accurate correction

Active Publication Date: 2019-04-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the color temperature and spectrum are not in one-to-one correspondence. For example, the color temperature of A light and U30 are close but the spectrum is very different, which will cause the color consistency model to be rough, resulting in inaccurate color shading correction when using this model

Method used

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  • Color shading correction method and device
  • Color shading correction method and device
  • Color shading correction method and device

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Embodiment Construction

[0043] The technical solution in this application will be described below with reference to the accompanying drawings.

[0044] figure 1 It is a schematic diagram of an application scene of color shading correction according to an embodiment of the present application. Specifically, the light reflected by the scene 11 is projected by the lens 12 to form a digital image signal on the image sensor 13. The digital image signal first undergoes operations such as dead pixel correction and black level compensation by the preprocessing module 14, and then the preprocessing The image signal of the image is input to the color shading estimation module 15, and the color shading estimation module 15 estimates the color shading of the image signal to obtain a correction table of the image. The correction module 16 corrects the image signal according to the correction table determined by the color shading estimation module. The subsequent processing module 17 further performs subsequent ...

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Abstract

The invention provides a color shading correction method and device capable of accurately correcting color shading of an image. The method comprises: a first image is received; a hue value of a firstpixel point in the first image in which a gradient is lower than or equivalent to a threshold is extracted; a transformation coefficient of the first pixel point is determined by using the hue value of the first pixel point and a feature contour of the first pixel, the feature contour is used for representing a feature of a color shading contour of a pixel point in the image that is obtained by statistically analyzing multiple standard light sources, and the transformation coefficient is used for representing the degree of strength of the feature contour; a color shading contour of a second pixel point in the first image is determined according to the transformation coefficient of the first pixel point and a color shading model; a color shading of the second pixel point is corrected according to the color shading contour of the second pixel point.

Description

technical field [0001] The present application relates to the field of image processing, and more particularly, to a method and device for color shading correction in the field of image processing. Background technique [0002] Due to the thin and light design requirements of wireless terminals and other mobile devices, the volume of the digital camera module is required to be smaller and smaller, which brings many side effects to the output image, one of which is color shading. Color shading refers to the color gradient from the center to the edge in the image output by the color camera module. Usually, in a camera module, an infrared cut-off (IR-CUT) filter is installed on the front of the digital image sensor, which blocks infrared light while passing through visible light, so as to ensure the accuracy of color reproduction. However, the cut-off wavelength of the infrared cut-off filter changes with the change of the incident light angle, resulting in different cut-off w...

Claims

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Application Information

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IPC IPC(8): H04N9/64
CPCH04N9/646H04N9/64
Inventor 尹玄武左坤隆郗东苗
Owner HUAWEI TECH CO LTD
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