A Computational Approach to Edge Detection
IEEE Transactions on Pattern Analysis and Machine Intelligence
A survey of thresholding techniques
Computer Vision, Graphics, and Image Processing
Gaussian-based edge-detection methods-a survey
IEEE Transactions on Systems, Man, and Cybernetics, Part C: Applications and Reviews
A recursive thresholding technique for image segmentation
IEEE Transactions on Image Processing
Object-based texture coding of moving video in MPEG-4
IEEE Transactions on Circuits and Systems for Video Technology
MPEG-4 standardized methods for the compression of arbitrarily shaped video objects
IEEE Transactions on Circuits and Systems for Video Technology
Overview of the H.264/AVC video coding standard
IEEE Transactions on Circuits and Systems for Video Technology
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Although rate-distortion adaptive, variable block-size motion compensation has significantly contributed to the performance improvement in compression efficiency of H.264/AVC over the other existing video coding standards, the shape of the block for motion compensation prediction (MCP) in H.264/AVC is still limited to the regular rectangle. To further improve the accuracy of MCP, a novel content-adaptive macroblock partition method for inter frame prediction is proposed in this paper, where irregularly shaped partitions are introduced to MCP. The proposed method irregularly segments the current coding macroblock (MB) by referring to the matching reference region (MRR) in the reference frames, which is obtained relying on the inherent structural similarity of the video contents among successive frames and can be traced with the relative displacement vector between the current MB and the MRR. Consequently, the irregular partition of the current MB is content adaptive and the partition information is implicitly indicated by the MRR, without resorting to an explicit description of the shape information of the irregular segmentation. Experimental results demonstrate that the proposed method outperforms the MCP based on the regular rectangle blocks in terms of coding efficiency, by providing more precise motion estimation for macroblocks at little cost of extra side information.