Multi-focus image fusion method based on quaternion wavelet transform

Abstract

The invention discloses a multi-focus image fusion method based on quaternion wavelet transform in order to more accurately integrate the information in a source image into a fusion image. The method comprises steps of: 1) subjecting two multi-focus images to be fused to quaternion wavelet transform in order to obtain a low-frequency sub-band (LL) and three high-frequency sub-bands (LH, HL, HH) of each layer, wherein each sub-band corresponds to four quaternion coefficient sub-bands, the four quaternion coefficient sub-bands can be transformed to an amplitude sub-band and three phase sub-bands by quaternion algebraic operation; 2) subjecting the low-frequency sub-band to fusion by a fusion rule based on improved phase gradient characteristic value maximization, and subjecting the high-frequency sub-bands to fusion by a fusion method based on quaternion matrix comprehensive multi-features; and 4) subjecting the fused high and low frequency sub-band coefficients to quaternion wavelet transform to obtain a fused image. The method can fully extract the features of the source image and accurately represent the source image so as to avoid introducing error information into the fused image and to improve a visual effect, and greatly improves the quality of the fused image compared with a traditional fusion method.

Description

technical field [0001] The invention relates to a multi-focus image fusion method based on quaternion wavelet transform, which is a fusion method in the technical field of multi-focus image processing and is widely used in the fields of machine vision, target recognition, digital cameras and the like. Background technique [0002] Multi-focus image fusion is one of the research contents of image fusion. When the camera shoots two targets A and B at different distances from the lens, it is often impossible to focus on the two targets at the same time. Usually, two shots are used to make one image focus on target A and the other image focus on target B, and then perform fusion processing on the two captured images to obtain an image with clear targets A and B. This process is called multi-focus image fusion to facilitate the observation of human eyes and the subsequent processing of computers. Multi-focus image fusion technology can effectively improve the utilization rate o...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the multi-focus image fusion method only considers a single feature and easily introduces wrong fusion information, and proposes a multi-focus image fusion method based on quaternion wavelet transform, which makes full use of the phase information of the coefficients, effectively Protect image details, enhance image contrast and clarity, improve its visual effect, and improve the quality of fusion images

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