Optical arbitrary-depth refocusing for large-depth scene in integral imaging display based on reprojected parallax image

In this paper, we propose an approach to optically refocus a large-depth three-dimensional (3D) scene on its real depth based on the reprojected parallax images. In the refocusing approach, the parallax images only related to the specific depth can be generated without black zone by reprojecting the captured parallax images. The elemental image array for the same depth can be obtained simply. Therefore, a high-quality refocusing of the 3D object at arbitrary depth can be achieved. The homography matrix used for reprojection contains both the calibration parameters of the camera array and the pixel shifting value related to the specific depth. Experiments on real-world scene are carried out and the results validate the feasibility of our proposed method.