Depth-map-based light field all-focus image generation method

Abstract

The method for generating a light-field all-focus image based on a depth map in the present invention belongs to the field of light-field imaging, and solves the problems of block effects and edge effects that exist when traditional full-focus images are generated using algorithms such as DCT and wavelet transform to achieve multi-image fusion. The defocused image obtained by the light field camera is used to generate an all-focus image, and the following steps are specifically adopted: 1) microlens calibration, 2) 4D light field acquisition, 3) digital refocusing, 4) depth acquisition, and 5) all-focus image generation , the present invention has the advantages of avoiding the limitation of the fusion algorithm when the traditional all-focus image is generated, can accurately find out the focus area of ​​the defocused image for all-focus image generation, and is superior to wavelet transform in dealing with block effects and edge effects Transform with DCT.

Description

technical field [0001] The invention belongs to the field of light field imaging, in particular to a method for generating a light field all-focus image based on a depth map. Background technique [0002] Due to the limitation of the depth of field, traditional cameras can only obtain a focused photo of a partial scene in one shot. To obtain a fully-focused photo of the entire scene in the camera's view, it is necessary to gradually manually zoom to obtain defocused photos of different depth levels. The defocusing method is used to obtain the all-in-focus image through multi-image fusion. Defocusing methods to generate all-in-focus images are mainly divided into two categories: one is to perform scale transformation in the transform domain, such as DCT transform, wavelet transform, etc. The other is to use spatial pixels for all-focus image generation, such as principal component analysis method, weighted average method, etc. [0003] The rise of light field imaging techno...

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Problems solved by technology

[0004] The present invention overcomes the deficiencies in the prior art, and solves the problem of block effect and edge effect when the traditional all-focus image is generated by using algorithms such as DCT and wavelet transform to achieve multi-image fusion, and aims to provide a depth map-based optical Field all-focus image generation method, this method avoids the limitation of the fusion algorithm in the traditional all-focus image generation, and can accurately find out the focus area of ​​the defocused image for all-focus image generation

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