Unlock instant, AI-driven research and patent intelligence for your innovation.

An automatic white balance adjustment method

A technology of automatic white balance and adjustment method, which is applied in the direction of color signal processing circuit, etc., and can solve problems such as white balance error

Inactive Publication Date: 2011-12-28
VIMICRO CORP
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But when a single color dominates the entire image, which is the so-called "big color block", the average color of an image will no longer be gray. If the white balance is still carried out according to the assumption of the gray world, the entire image the color is wrong
So the existing method will fail in this case, it will adjust the color to gray, resulting in wrong white balance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • An automatic white balance adjustment method
  • An automatic white balance adjustment method
  • An automatic white balance adjustment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The white balance realized on the basis of the theory of the gray world, if it encounters "big color blocks", it is easy to have adverse or even wrong effects on the white balance.

[0027] For the detection of large color block, the present invention proposes the method for gray point detection in a specific embodiment namely:

[0028] For a colored pixel, the pixel value is always composed of luminance and chroma. For YUV signal, the UV signal is a color difference signal. If the value of the UV signal falls within a certain range, the pixel can be considered as a gray point. .

[0029] If the proportion of gray points in the entire image exceeds a set threshold, such as accounting for 85% of the pixels in the entire image, it is considered that the entire image does not include large color blocks.

[0030] In a specific embodiment, the average value of each color component of all or part of the pixels in the entire image is calculated, and if one or more of the comp...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An automatic white balance adjustment method of the present invention can effectively detect the situation of large color blocks by detecting the number of gray points and constraining the relationship between each color component, and adjust the previous white balance factors to make large color blocks appear. White balance adjustments can still be made correctly even in the case of blackouts.

Description

technical field [0001] The invention relates to a method for adjusting the white balance of an image, in particular to a method for adjusting the white balance according to the judgment result of a large color block in the image. technical background [0002] In general natural images, if there are enough colors, their average color is gray. This is a gray world (Gray World) hypothesis. Based on this assumption, the white balance of an image with rich colors only needs to be adjusted so that the average value of all colors is close to it. But when a single color dominates the entire image, which is the so-called "big color block", the average color of an image will no longer be gray. If the white balance is still carried out according to the assumption of the gray world, the entire image The color is wrong. So the existing method will fail in this case, it will adjust the color to gray, resulting in wrong white balance. Contents of the invention [0003] In view of thi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/73
Inventor 沈操王浩汪源李红温元胜
Owner VIMICRO CORP