Improved super-resolution method by dense motion estimation using overlapped block matching

Authors:
Yasuo Takehisa;Kiyoshi Tanaka
Affiliations:
Nagano prefecture general industrial technology center, Nomizo-nishi, Matsumoto, Nagano, Japan;Shinshu University, Wakasato, Nagano, Nagano, Japan
Venue:
SIP '07 Proceedings of the Ninth IASTED International Conference on Signal and Image Processing
Year:
2007

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Abstract

In this work, we propose a method to improve the performance of super-resolution for video sequence by dense motion estimation (DME) using overlapped block matching (OBM). We first examine DME using hierarchical block matching (HBM) in super-resolution, and verify that the effectiveness of DME using HBM strongly depends on the quality of observed images. To solve this problem, we propose a method that realizes DME virtually in super-resolution using OBM. While this method does not improve the accuracy of motion estimation, it apparently increases the number of reference frames by allocating multiple motion vectors to a small region, which remarkably improves the performance of super-resolution. Through computer simulation, we verify that the proposed method consistently achieves robust performance irrelevant to the image quality of observed images.