Multi-exposure image fusion method based on wavelet transform

A technology of image fusion and wavelet transform, which is applied in the field of image processing, can solve the problem of loss of details near strong edges with brightness inversion, and achieve the effect of avoiding brightness inversion, avoiding loss of details, and improving contrast

Active Publication Date: 2016-11-16
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0008] The purpose of the present invention is to provide a multi-exposure image fusion method based on wavelet transform, which solves the technical problems of brightness inversion and loss of details near strong edges in the image obtained after image fusion in the prior art

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  • Multi-exposure image fusion method based on wavelet transform
  • Multi-exposure image fusion method based on wavelet transform
  • Multi-exposure image fusion method based on wavelet transform

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[0063] The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention.

[0064] Such as figure 2 As shown, specifically, the multi-exposure image fusion method based on wavelet transform provided by the present invention comprises the following steps:

[0065] (1) N pieces of input images are all converted to YUV color space according to the formula;

[0066] Y U V = 1 3 1 3 ...

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Abstract

The invention provides a multi-exposure image fusion method based on wavelet transform. A relative luminance relationship between pixels is described using maximum and minimum images of a brightness mean, and the relative luminance relationship is introduced into exposure moderation weight calculation to avoid brightness flip of a fused image and improve the overall contrast of the fused image; according to the method, hierarchical wavelet transform is carried out on a luminance component, an exposure moderation weight graph and a contrast weight graph, weight fusion is carried out on an approximate subgraph of the image luminance components by using the approximate subgraph of the exposure moderation weight graph, the weight fusion is carried out on a detail subgraph of the image luminance components by using the approximate subgraph of the adjusted contrast weight graph, details of different scales are enhanced in different scales, therefore areas on both sides of a strong edge of the fused image can be well exposed while the detail contrast is improved, and loss of the details is avoided.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a multi-exposure image fusion method based on wavelet transform. Background technique [0002] When an ordinary digital camera is used to shoot a scene with a large dynamic range, it is limited by the dynamic range. No matter how the exposure time is set, the details of the dark area and the highlight area in the scene cannot be clearly imaged at the same time, and undershooting will occur. exposure or overexposure. In the prior art, in order to clearly present the detailed information of the dark area and the bright area of ​​the scene, it is mostly realized by fusing multiple images with different exposure parameters into one image. Commonly used fusion methods: 1) Radiosity domain fusion method, which needs to estimate the camera response function and image imaging parameters, first generate a high dynamic image, and then map it to a low dynamic image for display thr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/50
CPCG06T5/50G06T2207/10004G06T2207/10024G06T2207/20064G06T2207/20192
Inventor 刘肖琳张文龙
Owner NAT UNIV OF DEFENSE TECH
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