Multi-exposure image fusion method based on sub-band structure

An image fusion and sub-band image technology, applied in image enhancement, image data processing, instruments, etc., can solve the problems of texture or contrast information loss, too bright or too dark, and inability to completely preserve image details, etc.

Inactive Publication Date: 2011-05-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing technologies for processing multi-exposure input image sequences generally cannot completely preserve the details in the image, such as the loss of texture or contrast information in the resulting image, and the situation that it is too bright or too dark compared to the original image

Method used

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  • Multi-exposure image fusion method based on sub-band structure
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  • Multi-exposure image fusion method based on sub-band structure

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Embodiment Construction

[0032] The preferred implementation method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] figure 1 A flow chart of the multi-exposure image fusion method based on the subband structure of the present invention is provided, and its main steps are as follows:

[0034] (1) Input a set of image sequences I with different exposure degrees about the same scene N (x, y), N is the number of input images;

[0035] (2) Use a set of odd length QMF (Quadrature Mirror Filter, quadrature mirror filter) as the analysis filter bank, specifically,

[0036] f l =[0.02807382, -0.06094473, -0.073386624,

[0037] 0.41472545, 0.797393400, 0.414725450,

[0038] -0.073386624, -0.060944743, 0.028073820]

[0039] f h =[0.02807382, 0.06094473, -0.073386624,

[0040] -0.41472545, 0.797393400, -0.414725450.

[0041] -0.073386624, 0.060944743, 0.028073820]

[0042] Each image I in the image sequence is transformed with the above ...

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Abstract

The invention relates to a multi-exposure image fusion method based on a sub-band structure. The method comprises the following steps: decomposing an input image into a group of sub-band images by a QMF (quadrature mirror filter) group serving as an analysis filter group; modifying the sub-band images with a weight graph; performing fusion based on the sub-band images to obtain the fused sub-bandimages; modifying the new sub-band images with a gain control graph; and finally, processing the sub-band images with a comprehensive filter group of a structure symmetrical with that of the analysisfilter group, and obtaining the fused result graph through a reconstruction process. The method can be automatically finished without manual intervention and can maintain details of the input image and enhance the contrast; and the obtained result image is more approximate to the real world scene which is directly observed by human eyes.

Description

technical field [0001] The invention relates to an image fusion method, in particular to a multi-exposure image fusion method based on a subband structure, and belongs to the field of digital image processing. Background technique [0002] Multi-exposure image fusion refers to the fusion of a set of image sequences with different exposure levels about the same scene into a high-quality composite image. The dynamic range of a digital camera (the ratio of the maximum brightness to the minimum brightness of a pixel in an image) is limited, which is lower than the real-world dynamic range (100000000:1). In high dynamic range scenes, photos taken with digital cameras are often underexposed or overexposed. Multi-exposure image fusion is a technique designed to address this problem, with which high dynamic range images can be generated. The principle of multi-exposure image fusion technology is consistent with that of traditional image fusion technology. Therefore, like tradition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/50
Inventor 沈建冰赵颖
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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