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Method for rapidly reinforcing color image based on Retinex theory

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

Inactive Publication Date: 2009-12-09
BEIHANG UNIV
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  • Application Information

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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

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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 et al. 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 simultaneously, only when the three channels surround the mean values ​​are ba...

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Abstract

The invention discloses a fast color image enhancement method based on Retinex theory. In the method, a new color space is firstly constructed, which not only simplifies the complex operation in the format conversion, but also ensures bright colors; secondly, by pre-constructing the mean value template , the convolution operation is simplified to mean value calculation, which greatly reduces the number of operations; finally, in the image post-processing stage, the distribution of pixel values ​​is adjusted through adaptive parameter selection. The invention can greatly reduce the number of calculations, improve the processing efficiency, and effectively avoid the color distortion phenomenon that may exist in the common multi-scale Retinex method, and is especially suitable for rapid enhancement processing of images in foggy, misty and other weathers.

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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T5/50
Inventor 李波王雯郑锦仙树
Owner BEIHANG UNIV