low-light-level image enhancement method and device based on Retinex

A low-light image and enhancement device technology, applied in the field of image processing, can solve problems such as being unsuitable for real-time use, low processing efficiency, image sharpening, etc., and achieve the effect of solving over-enhancement phenomenon, improving enhancement effect, and reducing the amount of calculation.

Active Publication Date: 2013-09-11
TANGSHAN CAOFEIDIAN LIANCHENG TECH CO LTD
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Problems solved by technology

The disadvantage is that it will sharpen the image to a certain extent, and reconstructing the image in the gradient domain requires a certain numerical algorithm, which is not suitable for real-time use
The Retinex enhancement method uses a Gaussian smoothing function to estimate the brightness component of the original image, and applies the illumination compensation method to approximate the reflection image, which can enhance the information i

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  • low-light-level image enhancement method and device based on Retinex
  • low-light-level image enhancement method and device based on Retinex
  • low-light-level image enhancement method and device based on Retinex

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[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0035] Such as figure 1 Is a flowchart of a low-light level image enhancement method provided by an embodiment of the present invention;

[0036] S102. Select the minimum value of each pixel in the three channels of R, G, and B from the original color image, and save the channel where the minimum pixel value is located, to obtain a minimum pixel value map and a minimum channel table;

[0037] It should be noted that the color images processed by the embodiment of the present invention are R, G, and B color spaces. If they are other spatial images, they ne...

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Abstract

The invention discloses a low-light-level image enhancement method and device based on Retinex and belongs to the technical field of image processing. The low-light-level image enhancement method based on the Retinex comprises selecting a minimum valve in three channels of R, G and B of every pixel from an original color image to obtain a minimum pixel value image and saving the channel where a minimum pixel value of the pixel is located, namely a minimum channel table; subjecting the minimum pixel value image to multi-scale Retinex processing to obtain a Retinex-processed image; and computing processed valves of the other two channels except a minimum channel of every pixel of the original image according to the Retinex-processed image, the minimum channel table and the proportion of every component of every pixel to obtain the enhanced color image. According to the embodiment of the low-light-level image enhancement method and device based on the Retinex, the enhancement effect of relatively dark areas of an image can be improved, and the image quality is improved; meanwhile, the computation is reduced greatly and the processing efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a Retinex-based low-light image enhancement method and device. Background technique [0002] Common image enhancement processing methods include grayscale transformation represented by histogram equalization method, homomorphic filtering method based on illumination-reflection model, gradient domain enhancement method and Retinex enhancement method, etc. The grayscale transformation method represented by the histogram equalization method can make the image grayscale distribution more uniform and enhance the image contrast, but it does not consider the frequency information and detail information of the image, and it is easy to produce an over-enhanced image. The homomorphic filtering method based on the illumination-reflection model divides the image into high and low frequency parts, and then performs filtering to enhance the contrast of the image while compressing the ...

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Application Information

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IPC IPC(8): G06T5/00
Inventor 李芳吴金勇
Owner TANGSHAN CAOFEIDIAN LIANCHENG TECH CO LTD
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