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White balance control device and method

A control method and white balance technology, which can be applied to picture signal generators, color signal processing circuits, televisions, etc., can solve problems such as inability to accurately adjust images with green objects, and achieve the effect of solving the failure of white balance algorithms

Active Publication Date: 2015-03-04
BYD SEMICON CO LTD
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Problems solved by technology

[0006] In order to solve the technical problem that the existing white balance technology cannot accurately adjust images with green objects, the present invention provides a white balance device and method that can accurately adjust images with green objects

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  • White balance control device and method
  • White balance control device and method

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Embodiment Construction

[0022] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0023] In view of the deficiencies in the existing automatic white balance, especially the adverse effects caused by large-area green objects in the image, it is necessary to remove the pixels with the characteristics of green object pixels in the reference white point from the reference white point, resulting in The reason why the pixel features of green objects are not easy to extract is that the pixels of green objects in the image are close to the pixel features of the reference white point under the CWF light source. It is necessary to conduct a large amount of stat...

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Abstract

The invention provides a white balance control method belonging to the field of digital image signal processing. The white balance control method comprises the steps of: a, detecting a green object pixel under sunshine irradiation and a green object pixel under daylight irradiation, and extracting green object pixel characteristics under two kinds of light sources; b, selecting a reference white point according to R (Red), G (Green) and B (Blue) values of each pixel point of an input image; c, removing the pixel point with the green object pixel characteristics from reference white points to obtain a second reference white point; and d, carrying out white balance processing on the image according to the second reference white point. In addition, the invention also provides a white balance control device. According to the invention, the second reference white point is obtained by removing the pixel point with the green object pixel characteristics from the reference white points, and the image is subjected to the white balance processing by using the second reference white point, thus the technical problem of a failed white balance algorithm when a large-area green object occurs in the image is solved.

Description

technical field [0001] The invention belongs to the field of digital image signal processing, and in particular relates to a white balance control device and method. Background technique [0002] The white or other colors seen by the human eye are related to many factors such as the inherent color of the object itself, the color temperature of the light source, the reflection or transmission characteristics of the object, and the visual perception of the human eye. [0003] The color reflected by an object has a lot to do with the color temperature of the light source. The reason why the human eye sees some objects as white, whether on a sunny day or cloudy day, indoors or under fluorescent lighting, is that the human brain can detect and correct color changes like this. The human eye can adapt itself, but digital video cameras do not have such intelligent functions. In order to be close to the human visual standard, a digital camera must imitate the human brain and adjust...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/73H04N5/232H04N9/04
Inventor 王达智梁剑张欣傅璟军胡文阁
Owner BYD SEMICON CO LTD
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