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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2008 E91-A(6):1408-1415; doi:10.1093/ietfec/e91-a.6.1408
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Image Media Quality - Papers

A Masking Model for Motion Sharpening Phenomenon in Video Sequences

Akira FUJIBAYASHI1 and Choong Seng BOON1

1 The authors are with Research Laboratories, NTT DoCoMo, Co. Ltd., Yokosuka-shi, 239-8536 Japan. E-mail: fujibayashi{at}nttdocomo.co.jp


  Abstract

In this paper, we show that motion sharpening phenomenon can be explained as a form of visual masking for a special case where a video sequence is composed of alternate frames with different level of sharpness. A frame of higher sharpness behaves to mask the ambiguity of a subsequent frame of lower sharpness and hence preserves the perceptive quality of the whole sequence. Borrowing the mechanism for visual masking, we formulated a quantitative model for deriving the minimum spatial frequency conditions which preserves the subjective quality of the frames being masked. The quantitative model takes into account three fundamental properties of the video signals, namely the size of motion, average luminance and the power of each frequency components. The psychophysical responses towards the changes of these properties are obtained through subjective assessment tests using video sequences of simple geometrical patterns. Subjective experiments on natural video sequences show that more than 75% of viewers could make no distinction between the original sequence and the one processed using the quantitative model.

Key Words: motion sharpening, subjective assessment, visual masking, human vision, quantitative model

Manuscript received June 5, 2007. Manuscript revised November 27, 2007.


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