Summary form only given. Most existing image coding techniques resolve the uncertainty of an image source on a pixel-by-pixel basis. We demonstrate the effectiveness of region-based image models for the class of palet...
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ISBN:
(纸本)0769514774
Summary form only given. Most existing image coding techniques resolve the uncertainty of an image source on a pixel-by-pixel basis. We demonstrate the effectiveness of region-based image models for the class of palette images. We propose to represent the index map of a palette image by a collection of successively refined color regions, from which the original index map can be reconstructed without any error. Within the framework of region-based modeling, we present a conditional coding approach to avoid information leakage during the multiple passes. Motivated by the distinguished characteristics of palette images, we propose to exploit topological property of isolated uniform-color regions while resolving the uncertainty of region boundaries. Our region-based image model not only provides an embedded representation of palette images in the topological space but also achieves excellent compression performance.
Source coding of multi-view image sequences is investigated. Two different frameworks are considered. The first one is a bidirectional predictive coding scheme, in which the displayed (intermediate) frames can be inst...
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ISBN:
(纸本)0819424358
Source coding of multi-view image sequences is investigated. Two different frameworks are considered. The first one is a bidirectional predictive coding scheme, in which the displayed (intermediate) frames can be instantaneously decoded given the coded furthest right and left images (I-frames). The second one is a unidirectional predictive coding scheme, in which the central frame is an I-frame and the remaining frames are coded based on this frame. Both frameworks can overcome problems related to occlusion, are compatible with current and proposed image and video coding standards, consider the special indexing characteristics of multi-view sequences, and can be implemented in applications where the display device has a small buffer. The actual coding is performed using the subspace projection technique (SPT), a locally adaptive incomplete transform approach, which incorporates disparity compensation and residual coding in a unified adaptive transform approach. The transformation matrix is equivalent to a projection operation and is determined using the local cross-correlation characteristics. Several design issues in generating the adaptive transforms and experimental results are presented.
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