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Method for rapidly reinforcing color image based on Retinex theory

A color image, fast technology, used in image enhancement, image data processing, instruments, etc., can solve the problem that the output image cannot be directly used for display or printing, the improvement effect is not obvious, the image is grayish, etc., and the operation time is short. , reducing the number of operations, the effect of high processing efficiency

Inactive Publication Date: 2008-11-12
BEIHANG UNIV
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Problems solved by technology

The output image at this time cannot be directly used for display or printing, and must be processed accordingly to map the pixels of the output image to the range of 0 to 255, otherwise the resulting image is gray and the improvement effect is not obvious

Method used

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  • Method for rapidly reinforcing color image based on Retinex theory
  • Method for rapidly reinforcing color image based on Retinex theory
  • Method for rapidly reinforcing color image based on Retinex theory

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Embodiment Construction

[0033] The fast color image enhancement method provided by the present invention is further developed from the existing multi-scale enhancement method (MSR) based on Retinex theory. Compared with the prior art, the main improvement is reflected in the optimization of the processing effect and the improvement of the operation efficiency. This is described in detail below.

[0034] see figure 1 As shown in the implementation flowchart, the fast color image enhancement method includes the following steps:

[0035] 1. Construct a new color space: convert the original image to the color space, select the maximum value of the three color channels of R, G, and B as the brightness information, and obtain the brightness image.

[0036] Hurbert and others pointed out that the Retinex theory actually hides a "gray world" assumption, that is, when the ordinary MSR method operates on the three channels R, G, and B at the same time, only when the three channels surround the mean value is ...

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Abstract

The invention discloses a rapid color image enhancement method based on Retinex theory. In the method, firstly, a new color space is structured, thus simplifying the complicated operation in format conversion and also ensuring bright color; secondly, the convolution operation is simplified into averaged value calculation by pre-structuring an average template, thus greatly reducing operation frequency; finally, in the post-treatment stage of the image, the distribution of the pixel value is adjusted through the adaptive parameter selection. The adoption of the invention can greatly reduce operation frequency, enhance the processing efficiency and effectively avoid the phenomenon of color distortion possibly existing in the ordinary multi-scale Retinex method. The method is in particular suitable for rapid and enhancement processing of images in the weather such as fog, mist, etc.

Description

technical field [0001] The present invention relates to a fast image enhancement method suitable for color images, in particular to a method based on the Retinex theory, which reduces the amount of calculation of color space conversion by constructing a new color space, and improves the calculation speed by simplifying the Gaussian convolution operation. A fast color image enhancement method belongs to the technical field of digital image processing. Background technique [0002] Color image enhancement is one of the effective measures to improve image quality. It enhances image details and improves image quality without causing distortion or color cast, making the image more vivid and colorful, which is convenient for human observation and machine post-processing. At present, color image enhancement mainly includes two tasks: grayscale image enhancement and color information processing in color space. [0003] Conventional enhancement methods for grayscale images mainly i...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T5/50
Inventor 李波王雯郑锦仙树
Owner BEIHANG UNIV
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