Open AccessOptical full-depth refocusing of 3-D objects based on subdivided-elemental images and local periodic δ-functions in integral imaging
Author(s) -
Lingyu Ai,
Xiaobin Dong,
Jae-Young Jang,
Eun-Soo Kim
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.010359
Subject(s) - integral imaging , optics , object (grammar) , spatial frequency , pickup , range (aeronautics) , computer science , ray tracing (physics) , physics , lens (geology) , computer vision , image (mathematics) , artificial intelligence , materials science , composite material
We propose a new approach for optical refocusing of three-dimensional (3-D) objects on their real depth without a pickup-range limitation based on subdivided-elemental image arrays (sub-EIAs) and local periodic δ-function arrays (L-PDFAs). The captured EIA from the 3-D objects locating out of the pickup-range, is divided into a number of sub-EIAs depending on the object distance from the lens array. Then, by convolving these sub-EIAs with each L-PDFA whose spatial period corresponds to the specific object's depth, as well as whose size is matched to that of the sub-EIA, arrays of spatially-filtered sub-EIAs (SF-sub-EIAs) for each object depth can be uniquely extracted. From these arrays of SF-sub-EIAs, 3-D objects can be optically reconstructed to be refocused on their real depth. Operational principle of the proposed method is analyzed based on ray-optics. In addition, to confirm the feasibility of the proposed method in the practical application, experiments with test objects are carried out and the results are comparatively discussed with those of the conventional method.