Algorithm for Omnifocus Image Generation of Microlens Light Field Camera Based on Blocking Effect

Abstract

The invention belongs to the field of light field image processing, and in particular discloses a microlens light field camera all-focus image generation algorithm based on block effects. The algorithm is directly fused based on 4D light field data, and the data fusion rules are established through the same calculation space. The block effect of light field macropixels formed by light energy integration in different directions at different positions is used to complete the focus degree evaluation, and finally the fused 4D light field is integrated to obtain a fully focused image. The effectiveness of the algorithm of the present invention has been demonstrated through experiments. The present invention is based on The fused image obtained from the angle information has the same visual effect as the fused image obtained based on the spatial information. From the comparison results of the average quality evaluation of the fused image, the algorithm of the present invention obtains the highest perceptual definition value of the image, and the phase consistency value and normalized The mutual information value is second only to 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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