Image-based refocusing by 3D filtering

Authors:
Akira Kubota;Kazuya Kodama;Yoshinori Hatori
Affiliations:
Interdisciplinary Graduate School of Science and Technology, Tokyo Institute of Technology, Yokohama, Japan;Research Organization of Information and Systems, National Institute of Informatics, Tokyo, Japan;Interdisciplinary Graduate School of Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
Venue:
PSIVT'07 Proceedings of the 2nd Pacific Rim conference on Advances in image and video technology
Year:
2007

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Abstract

This paper presents a novel spatial-invariant filtering method for rendering focus effects without aliasing artifacts from undersampled light fields. The presented method does not require any scene analysis such as depth estimation and feature matching. First, we generate a series of images focused on multiple depths by using the conventional synthetic aperture reconstruction method and treat them as a 3D image. Second we convert it to the alias-free 3D image. This paper shows this conversion can be achieved simply by a 3D filtering in the frequency domain. The proposed filter can also produce depth-of-field effects.