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Optical Engineering

Digital camcorder image stabilizer based on gray-coded bit-plane block matching
Author(s): YeouMin Yeh; Huang-Cheng Chiang; Sheng-Jyh Wang
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Paper Abstract

We propose an efficient algorithm to eliminate the nonpleasing effect caused by involuntary hand movement of camera holders. In our approach, 1-bit gray-coded bit-plane block matching, instead of 8-bit gray-level block matching, is used to greatly simplify the computation of motion estimation. This computation saving makes possible a finer division of image frame and thus facilitates the employment of a much more robust procedure for motion decision. To deal with various interfering factors in motion estimation, the temporal information of each local motion vector is also used to efficiently distinguish random-like movement from temporally correlated movement. To compensate for camera rotation, an affine model is used in the motion compensation unit without adding too much computation load. Having considered both programming flexibility and hardware efficiency, the motion decision unit and the motion compensation unit are coded in a microprocessor that interconnects with the stabilization hardware, which consists of the motion estimation unit and the digital zooming unit. A slightly simplified version of the proposed stabilizer is implemented on a field programmable gate array (FPGA) board.

Paper Details

Date Published: 1 October 2001
PDF: 7 pages
Opt. Eng. 40(10) doi: 10.1117/1.1405415
Published in: Optical Engineering Volume 40, Issue 10
Show Author Affiliations
YeouMin Yeh, National Chiao Tung Univ. (Taiwan)
Huang-Cheng Chiang, ITRI (Taiwan)
Sheng-Jyh Wang, National Chiao Tung Univ. (Taiwan)

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