Method for generating full-focus image of light field based on depth map

Abstract

The invention discloses a method for generating a full-focus image of a light field based on a depth map, belongs to the field of light field imaging, and solves a problem that a block effect and an edge effect exist in multi-image fusion realized by adopting an algorithm such as DCT and wavelet transform in a traditional full-focus image generation process. The method adopts a defocusing image obtained by a light field camera to generate the full-focus image, and specifically comprises the following steps of (1) micro-lens calibration; (2) 4D light field acquisition; (3) digital refocusing; (4) depth acquisition and (5) full-focus image generation. The method has the advantages that the limitation of a fusion algorithm in the traditional full-focus image generation process is avoided, a focusing area of the defocusing image can be accurately found out to carry out full-focus image generation, and meanwhile, the method is superior to the wavelet transform and the DCT transform on the block effect and the edge effect.

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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