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Automatic white balance method and circuit

An automatic white balance and circuit technology, applied in the direction of color signal processing circuit, picture signal generator, etc., can solve the problems of incompatibility, achieve good correction performance, save hardware resource overhead, and good correction reliability

Inactive Publication Date: 2014-01-15
SHANGHAI JIAO TONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the classical methods are always unable to take into account the performance, stability and hardware overhead, and all have their own serious defects.

Method used

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  • Automatic white balance method and circuit
  • Automatic white balance method and circuit

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Embodiment Construction

[0038] The implementation of the present invention will be described below through specific specific examples and in conjunction with the accompanying drawings. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific examples, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0039] figure 1 It is a flowchart of steps of an automatic white balance method of the present invention. Such as figure 1 Shown, a kind of method of automatic white balance of the present invention is used for the preprocessing of digital camera image, comprises the steps:

[0040] Step 101, collecting the histogram information of each channel of the image and extracting repres...

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Abstract

The invention discloses automatic white balance method and circuit. The method comprises the steps that the histogram information of each channel of the current image RGB is collected, and representative location data in each histogram are extracted; the gain coefficient of each channel is calculated by using the comparison between the location data; and linear transformation is carried out on the gain coefficient, which is acquired through calculation, of the histogram of each channel, so as to acquire an image after automatic white balance. According to the invention, by collecting the histogram information of the image of the previous frame, the gain of each channel of the image of the next frame is analyzed and calculated; good correction performance and correction reliability are kept; and at the same time the hardware cost is furthest saved.

Description

technical field [0001] The invention relates to the field of digital image processing, in particular to an automatic white balance method and circuit with low hardware overhead and better performance and stability. Background technique [0002] Auto White Balance (Auto White Balance) is a very important link in the digital image preprocessing system. The so-called white balance can be understood as restoring the photo color of a white object to white. Objects have their own colors because their surfaces selectively absorb and reflect visible light in part of the wavelength range, and the reflected light is the color of the object. When the light of the light source is not natural light but has a certain color, the light reflected by the object is not only its own color, but also has the color of the light source. The human eye has a strong ability to adapt, and can automatically shield part of the color of the light source in an environment with colored light sources, that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/73H04N9/04
Inventor 华洪略金威何卫锋洪亮李琛赵宇航贺光辉
Owner SHANGHAI JIAO TONG UNIV