Low-illumination image enhancement method based on image fusion

An image enhancement and image fusion technology, applied in image enhancement, image analysis, image data processing, etc., can solve the problems of poor visual quality, boring, image distortion, etc., and achieve the effect of strong contrast, improved quality, and natural color

Pending Publication Date: 2020-03-27
HANGZHOU DIANZI UNIV
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AI Technical Summary

Problems solved by technology

[0003] Low-light images are one of the main contributors to poor visual quality of images, distorting images in the dark or with uneven lighting
While software exists that allows users to interactively adjust photos, it is quite tedious and difficult for non-professionals as it requires manipulating controls such as color and contrast while finely adjusting various objects and details in the photo

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  • Low-illumination image enhancement method based on image fusion
  • Low-illumination image enhancement method based on image fusion
  • Low-illumination image enhancement method based on image fusion

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] The method of the present invention first converts the image from the RGB space to the HSV space, and then estimates the initial illumination map from the V channel; filters the initial illumination map to obtain a further accurate illumination map; performs gamma correction on the illumination map to obtain Multiple intermediate images; determine the weight of the intermediate images, and perform image fusion to obtain the final illumination image; obtain the reflection image, and convert from the HSV space back to the RGB space to obtain the final enhanced image.

[0032] The implementation process is as follows figure 1 shown. The method of the present invention comprises the following steps:

[0033] Step 1: Convert the image from RGB space to HSV space to obtain the initial light map;

[0034] The human eye is more sensitive to...

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Abstract

The invention discloses a low-illumination image enhancement method based on image fusion. The method comprises the steps of firstly converting an image from an RGB space to an HSV space, and then estimating an initial illumination image I from a V channel; filtering the initial illumination image I to obtain a further accurate illumination image II; performing gamma correction on the illuminationimage II to obtain a plurality of intermediate images; determining the weight of the intermediate image, and performing image fusion to obtain a final illumination image III; and solving a reflectiongraph, and converting the reflection graph from the HSV space to the RGB space to obtain a final enhancement graph. According to the fusion-based low-illumination image enhancement algorithm providedby the invention, an image can be effectively enhanced for a low-illumination condition, and an image with high contrast ratio, natural color and good visual effect is obtained. The algorithm can beapplied to a mobile phone, only one-key operation is needed, the quality of a low-light image is effectively improved, and the photographing experience of a user is improved.

Description

technical field [0001] The invention relates to the field of image enhancement, in particular to a low-light image enhancement method based on image fusion. A method for low-light image enhancement, determining optimal reflectance maps. Background technique [0002] With the popularity of advanced mobile devices, especially the application of cameras on mobile phones, people can take pictures almost anytime and anywhere. With the vigorous development of social media platforms, a large number of photos are produced and shared every day, forming a kind of important big data. However, the quality of these data visualizations is not guaranteed, because the source of these data visualizations is quite open. On the one hand, when it comes to taking pictures, most people are amateurs or have little knowledge of photography techniques, and they often choose sub-optimal shooting parameters. On the other hand, there are many challenging shooting conditions that lead to low-quality ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/50G06T5/00
CPCG06T5/50G06T5/006G06T2207/10024G06T2207/20221G06T2207/20172
Inventor 颜成钢陈利黄晓峰郑锦凯孙垚棋张继勇张勇东王晓冬沈韬
Owner HANGZHOU DIANZI UNIV
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