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Low-light-level image enhancement method based on fusion technology

An image enhancement and low-light technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as color distortion, and achieve the effect of satisfying real-time processing, low computational complexity, and improving visual quality.

Inactive Publication Date: 2017-03-08
TIANJIN UNIV
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Problems solved by technology

This kind of method can effectively improve the contrast of the image, but the processed image sometimes has color distortion

Method used

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  • Low-light-level image enhancement method based on fusion technology
  • Low-light-level image enhancement method based on fusion technology
  • Low-light-level image enhancement method based on fusion technology

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Embodiment Construction

[0043] The proposed method includes four steps: estimating the illumination component, constructing the subgraph of the illumination component, calculating the weighted map, and image reconstruction. figure 1 The realization block diagram of the method of the present invention is given.

[0044] 1. Estimated exposure component

[0045] The input low-illuminance color image (represented by F) can be regarded as the product form of the illumination component (represented by L) and the reflection component (represented by R), that is, F=L×R. Among them, the illumination component reflects the illumination conditions of each part of the image, and the reflection component reflects the reflection characteristics of each object in the image. Poor lighting conditions are the main reason for the degradation of the visual quality of low-light images, and the adverse effects of lighting conditions can be suppressed by correcting the illumination components.

[0046] The illumination c...

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Abstract

The invention relates to a low-light-level image enhancement method based on a fusion technology. The method comprises that F<c> is used to represent an input colored low-light-level image, C represents R, G and B channels, and a radiation component L1 and a reflection component RC are calculated; a contrast limited histogram equalization method(CLAHE) is used to process the L1 to obtain a contrast enhanced result image L2; a low-grayscale part in the L1 image is extended, a high-grayscale part is compressed, and a processing result is represented by L3; a radiation component weighted subimage and a chroma component weighted subimage are calculated; a synthesis weight image is calculated; a new radiation component image is synthesized; and an enhanced colored image is reconstructed. According to the method of the invention, the low-light-level image is enhanced effectively, the image contrast is enhanced, color information of the original image is reserved effectively, and the visual image of the image is improved substantially.

Description

technical field [0001] The invention relates to color image enhancement technology, in particular to the enhancement technology for low-light images. Background technique [0002] Digital cameras and smart terminal devices with camera functions have become one of the most commonly used consumer electronic products in people's daily life. People can use this kind of equipment to take various photos and video recordings anytime and anywhere, and they bring convenience and happiness to our life. People often encounter situations with weak light when shooting, and weak light source intensity and occlusion are the main reasons for such situations. In the world of digital imaging, these situations are collectively referred to as "low light." Photos or videos captured under low-light conditions usually have poor visual quality, such as low contrast, dim colors, and loss of detail in dark areas. [0003] At present, the industry mainly adopts image enhancement technology to enhan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/50
CPCG06T5/50G06T5/92
Inventor 王建庞彦伟曲畅
Owner TIANJIN UNIV
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