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- W2048653982 abstract "This paper proposes a compression scheme for face profile images based on three stages, modelling, transformation, and the partially predictive classified vector quantization (CVQ) stage. The modelling stage employs deformable templates in the localisation of salient features of face images and in the normalization of the image content. The second stage uses a dictionary of feature-bases trained for profile face images to diagonalize the image blocks. At this stage, all normalized training and test images are spatially clustered (objectively) into four subregions according to their energy content, and the residuals of the most important clusters are further clustered (subjectively) in the spectral domain, to exploit spectral redundancies. The feature-basis functions are established with the region-based Karhunen–Loeve transform (RKLT) of clustered image blocks. Each image block is matched with a representative of near-best basis functions. A predictive approach is employed for mid-energy clusters, in both stages of search for a basis and for a codeword from the range of its cluster. The proposed scheme employs one stage of a cascaded region-based KLT-SVD and CVQ complex, followed by residual VQ stages for subjectively important regions. The first dictionary of feature-bases is dedicated to the main content of the image and the second is dedicated to the residuals. The proposed scheme is experimented in a set of human face images." @default.
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- W2048653982 date "1999-09-01" @default.
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- W2048653982 title "A Region-Based Scheme Using RKLT and Predictive Classified Vector Quantization" @default.
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- W2048653982 doi "https://doi.org/10.1006/cviu.1999.0776" @default.
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