Micro-lens light field camera full-focus image generation algorithm based on blocking effect

Abstract

The invention belongs to the field of light field image processing, and particularly discloses a micro-lens light field camera full-focus image generation algorithm based on a blocking effect. According to the algorithm, fusion is directly carried out based on 4D light field data; when the data fusion rule is established, the focusing degree evaluation is completed by calculating the blocking effect of light field macro pixels formed by light energy integration in different directions at the same spatial position, and finally, the fused 4D light field is integrated to obtain a full-focus image. The effectiveness of the algorithm is demonstrated through experiments. The fusion image obtained based on the angle information and the fusion image obtained based on the space information have thesame visual effect, the perception definition value of the image obtained through the algorithm is the highest from the average quality evaluation comparison result of the fusion image, and the phaseconsistency value and the normalization mutual information value are only second to those of the BF algorithm.

Description

technical field [0001] The invention belongs to the field of light field image processing, in particular to an all-focus image generation algorithm for a microlens light field camera based on block effect. Background technique [0002] The traditional all-focus image is obtained by fusion of multiple local clear images taken by the camera’s continuous focusing and multiple exposures. Most of the fusion algorithms used are based on pixel or area-based calculation of the focus characteristics of the image, and the fusion rules are established by comparing the size of the feature values. . Due to the change of the imaging geometric relationship and mechanical shake during the camera focusing process, the field of view and viewpoint position of the images captured at different times change, and the reduction of image matching results in an increase in the complexity of the later image fusion algorithm. The microlens array light field camera developed from the theory of light fi...

AI Technical Summary

Problems solved by technology

[0004] The invention aims to overcome the deficiencies of the existing technology, solve the problem that the existing algorithm ignores the contribution of the 4D light field angle information to the evaluation of the focus degree during data fusion, and provides a microlens light field camera full-focus image generation based on block effect Algorithm, the present invention analyzes 4D light field data from another perspective, the algorithm fuses 4D light field data, splits light field digital refocusing into two steps of coordinate transformation and integration, and then adds the intermediate step 4D light field Data fusion, enabling all-in-focus image calculations during digital refocusing

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