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Real-time low-light color image enhancement method and implementation method thereof

A color image and enhancement device technology, which is applied in image enhancement, image data processing, instruments, etc., can solve the problems of insufficient real-time processing and achieve the effect of obvious enhancement effect and high real-time processing

Active Publication Date: 2014-12-10
CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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Problems solved by technology

[0004] In order to overcome the problem of insufficient real-time processing existing in the prior art, the object of the present invention is to provide a real-time low-illuminance color image enhancement method, which performs real-time enhancement processing on low-illuminance color video images, expands the dynamic range of the image, and improves the contrast. At the same time, it can realize the enhancement of high-speed and high-resolution video surveillance images, and improve the visual effect of video images

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  • Real-time low-light color image enhancement method and implementation method thereof
  • Real-time low-light color image enhancement method and implementation method thereof
  • Real-time low-light color image enhancement method and implementation method thereof

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[0036] A method for real-time enhancement of low-illuminance color images of the present invention, its processing flow is as follows figure 1 shown. All steps in the figure are implemented in FPGA, including RGB to YCbCr module, histogram equalization module, nonlinear transformation module and YCbCr to RGB module. The RGB to YCbCr module is used to convert the RGB color image to the YCbCr color space. The histogram equalization module is used for performing histogram equalization processing on the Y component of the YCbCr color space. The nonlinear transformation module performs threshold judgment on Cb and Cr color components respectively, and performs nonlinear transformation on components not in the range of the set threshold. The YCbCr to RGB conversion module is used to inversely transform the processed YCbCr color components into RGB color space.

[0037] The specific implementation scheme of the present invention is realized by using Altera's Arrial-II series FPGA....

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Abstract

The invention discloses a real-time low-light color image enhancement method. The method includes the steps: firstly, converting an RGB color image to a YCbCr color space; secondly, subjecting a Y-component of the YCbCr color space to histogram statistics and performing histogram equilibrium processing; thirdly, performing threshold determination on Cb and Cr color components respectively, and performing nonlinear transformation on the components out of a set threshold range; fourthly, subjecting the processed YCbCr color components to inverse transformation to an RGB color space, and finally acquiring the enhanced color image. The invention further provides a device of the real-time low-light color image enhancement method. All processing procedures are implemented in an FPGA (field programmable gate array). By the method and the device, the color video images low in light can be subjected to real-time enhancement, the dynamic range of the images is expanded, contrast ratio is increased, enhancement of high-speed high-resolution video monitoring images can be realized, and visual effect of the video images is improved.

Description

technical field [0001] The invention relates to a real-time video image processing technology, in particular to a video image enhancement processing technology. Background technique [0002] Video image enhancement processing technology has always been a very important basic processing technology in the field of image processing. The application of image enhancement processing technology has penetrated into aerospace, military reconnaissance, medical diagnosis, satellite image processing and other fields. For example, the vision enhancement system of an aircraft in bad weather needs to use image enhancement processing methods to overcome image blur caused by insufficient light, sand, dust, smoke, etc., so as to provide visual navigation for the aircraft. The video surveillance system tends to cause blurred video and unclear images in an environment with insufficient light. Through image enhancement processing, the quality of video images can be improved and better visualiza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/40
Inventor 周伟杨爱良刘军江陆伊
Owner CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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