A low-light image enhancement method and system

An image enhancement, low-illumination technology, applied in the field of image processing, can solve the problems of lack of universality, large amount of calculation, difficult to process high-definition images in real time, etc., and achieve the effect of avoiding image blur, small amount of calculation, and maintaining image edge information
CN104182947BActive Publication Date: 2017-04-26深圳市百乐奇科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
深圳市百乐奇科技有限公司
Publication Date
2017-04-26

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Abstract

The invention discloses a low-illumination image enhancement method and system, and belongs to the technical field of image processing. The method comprises the steps of converting an input original image into an HIS space from an RGB space, keeping the saturability and the hue component of the image unchanged, enhancing the brightness component, converting the image with the brightness enhanced into the RGB space from the HIS space and outputting the image. According to the low-illumination image enhancement method and system, the image brightness is improved, extremely-dark areas (the areas close to black) are prevented from being changed into bright-colored areas after being enhanced, and the image adapts to the human visual characteristics better. Meanwhile, the complexity is low, the calculation amount is small, high-definition images can be processed in real time, and the performance requirement for hardware can be lowered.
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Description

technical field

[0001] The invention relates to the technical field of image processing, in particular to a low-illuminance image enhancement method and system. Background technique

[0002] In the application of image acquisition or video surveillance, there are often low-illumination situations such as night vision or backlight, and the collected images are dark and have low recognizability. Specific applications need to be processed after image enhancement. Image enhancement is to expand the brightness range of the image and improve the overall brightness of the image, improve the subjective quality of the image, so that the unrecognizable image details can be recognized by human eyes or machines.

[0003] Common image enhancement processing methods include brightness transformation method, homomorphic filtering method, gradient domain enhancement method and Retinex enhancement method, etc. The brightness transformation method represented by the histogram equalization me...

Claims

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