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Efficiency of displacement estimation techniques

SIGNAL PROCESSING-IMAGE COMMUNICATION 1997年第1-3期10卷 43-61页

作者： Buschmann, R Institut für Theoretische Nachrichtentechnik und Informationsverarbeitung Universität Hannover Appelstraβe 9A D-30167 Hannover Germany

An analytical description of displacement estimation which allows an objective evaluation and comparison of various displacement estimation techniques is presented. For evaluation and comparison rate-distortion functions are calculated and by this the impact of the 2D motion model of the displacement estimator and the amplitude and spatial resolution of the estimated sparse displacement vector held can be quantified. The rate-distortion function describes the relationship between the encoding bit-rate required for transmission of the measured displacement vector field and the variance of the displacement error. The impact of the spatial and amplitude resolution of the sparse displacement vector field is described by sampling and quantisation of an exact displacement signal. The 2D motion model is considered by low pass filtering the exact displacement signal before sampling and subsequent spatial interpolation. The analytical description is verified by simulations of various displacement estimation techniques, the 2D motion models of which can be described by the nearest neighbour, affine and bilinear displacement vector interpolation, at different amplitude and spatial resolutions. The analytical description allows one to optimise a displacement estimation technique for motion compensated image sequence coding. (C) 1997 Elsevier Science B.V.

关键词： image coding generalized displacement estimation displacement coding rate distortion theory

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MINIMIZATION OF SUBMESH BOUNDARY ERRORS IN DYNAMIC MESH coding 31

MINIMIZATION OF SUBMESH BOUNDARY ERRORS IN DYNAMIC MESH CODI...

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2024 International Conference on Image Processing

作者： Kishimoto, Koki Kawamura, Kei Kato, Haruhisa KDDI Res Inc XR Div Adv Visual Commun Lab Saitama Japan

ISBN: (纸本)9798350349405;9798350349399

The video-based dynamic mesh coding (V-DMC) standard is a cutting-edge technology for the compression of dynamic mesh data. V-DMC enables parallel encoding and partial decoding by introducing submesh frameworks in which dynamic meshes are separated and independently processed. However, V-DMC may raise submesh boundary errors like holes due to misaligning the existence or coordinates of vertices, degrading the objective and subjective qualities of decoded dynamic meshes. To minimize the boundary errors and improve the coding performance, we propose a two-stage boundary error correction method in V-DMC's preprocessing and encoding/decoding stages. Specifically, the first stage rearranges the preprocessing order to minimize boundary errors, whereas the second stage fills holes based on boundary information. Experimental results show that the proposed method can minimize the boundary errors among the V-DMC decoded meshes, and thus significantly improve the objective and subjective quality compared to the V-DMC reference software.

关键词： V-DMC dynamic mesh coding submesh displacement coding

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