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Fast Motion Estimation for Quad-Tree Based Video Coder Using Normalized Cross-Correlation Measure
Eskinder Anteneh Ayele, Ravindra Eknath Chaudhari, S. B. Dhok
Pages - 330 - 338     |    Revised - 15-08-2013     |    Published - 15-09-2013
Volume - 7   Issue - 4    |    Publication Date - September 2013  Table of Contents
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KEYWORDS
FFT, Motion Estimation, Normalized Cross Correlation, Quad-tree, Video Compression.
ABSTRACT
Motion estimation is the most challenging and time consuming stage in block based video codec. To reduce the computation time, many fast motion estimation algorithms were proposed and implemented. This paper proposes a quad-tree based Normalized Cross Correlation (NCC) measure for obtaining estimates of inter-frame motion. The measure operates in frequency domain using FFT algorithm as the similarity measure with an exhaustive full search in region of interest. NCC is a more suitable similarity measure than Sum of Absolute Difference (SAD) for reducing the temporal redundancy in video compression since we can attain flatter residual after motion compensation. The degrees of homogeneous and stationery regions are determined by selecting suitable initial fixed threshold for block partitioning. An experimental result of the proposed method shows that actual numbers of motion vectors are significantly less compared to existing methods with marginal effect on the quality of reconstructed frame. It also gives higher speed up ratio for both fixed block and quad-tree based motion estimation methods.
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1 Chaudhari, R. E., & Dhok, S. B. Fast Quadtree Based Normalized Cross Correlation Method for Fractal Video Compression using FFT.
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Dr. Eskinder Anteneh Ayele
Research Scholar/ Department of Electronics Enginee ring Visvesvaraya National Institute of Technology Nagpur,440022 - India
Mr. Ravindra Eknath Chaudhari
Asst. Professor/Dept. of ECE St. Francis Institute of Technology Mumbai,400103 - India
Dr. S. B. Dhok
Asso. Professor/Department of Electronics Engineeri ng Visvesvaraya National Institute of Technology Nagpur,440022 -
sbdhok@vnit.ece.ac.in