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LBP-based image white balance method

A white balance and image technology, applied in the field of image processing, can solve the problems of failure to consider the local change characteristics of the image scene, poor image correction effect, etc., and achieve the effect of a wide range of applications

Inactive Publication Date: 2016-11-16
THE THIRD RES INST OF MIN OF PUBLIC SECURITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods fail to take into account the local variation characteristics in the image scene, so the correction effect of some images with obvious local illumination is poor.

Method used

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Embodiment Construction

[0042] In order to describe the technical content of the present invention more clearly, further description will be given below in conjunction with specific embodiments.

[0043] Aiming at the deficiencies in the prior art above, the present invention proposes an image white balance algorithm based on local binary template calculation. The method adopts image index space transformation, local binary template calculation and comprehensive variance statistics, and finally through Points determine the characterization of image brightness and chromaticity to complete the correction of the entire image color.

[0044] The present invention is achieved through the following technical solutions, specifically comprising the following steps:

[0045] Step 1, perform exponential space transformation on the image, the specific formula is as follows

[0046] I LOG =log(I R,G,B )

[0047] I LOG is the image after exponential transformation, and log is the exponential operation of the...

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Abstract

The invention relates to an LBP-based image white balance method. The method comprises the steps of performing index space conversion on a to-be-processed image; calculating LBP values in an index space separately; calculating a variance STD of LBP values of an RGB space; selecting an optimal pixel point according to the variance STD; and performing correction on the to-be-processed image by adopting an RGB value of the optimal pixel point. According to the LBP-based image white balance method adopting the structure, the problem of large color deviation in an image white balance process is solved by utilizing image index space conversion, a local binary image template and comprehensive variance statistics; and local characteristics of a spatial domain in an image scene are fully utilized, and extraction of illumination invariant pixel points is realized through local binary template calculation, so that the problem that cannot be solved by a conventional method is solved and a wider application range is achieved.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to an image white balance method, in particular to an LBP-based image white balance method. Background technique [0002] Image white balancing is an image processing process used to restore the true color of an object under different lighting conditions. In the image white balance processing technology, the mainstream methods include machine learning-based methods and statistical analysis-based methods. The former performs machine learning based on image databases and annotation results, and its processing results for training databases can obtain higher accuracy. However, once faced with new images, satisfactory results are often not obtained. The method based on statistical analysis usually uses some image analysis and processing methods to obtain the brightness and chrominance estimation of the current image, and then obtains the white balance result. Compared ...

Claims

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Application Information

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IPC IPC(8): G06T3/00
CPCG06T3/04
Inventor 姚晨朱佳敏王贤瑞
Owner THE THIRD RES INST OF MIN OF PUBLIC SECURITY