Address-Vector Quantization : An Adaptive Vector Quantization Scheme Using Interblock Correlation

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Abstract
Memoryless vector quantizers exploit the high correlation and the spatial redundancy between neighboring pixels, but they totally ignore the spatial redundancy between the blocks. In this paper a new vector quantization scheme called the Address-Vector Quantizer (A-VQ) is proposed. It is based on exploiting the inter-block correlation to encode a group of blocks together by using an address-codebook. The address-codebook consists of a set of address codevectors where each represents a combination of blocks, with each of its element being the address of a LBG-codebook entry representing a vector quantized block. The address-codebook consists of two regions, one is the active (addressable) region, and the other is the inactive (non-addressable) region. During the encoding process the codevectors in the address-codebook are reordered adaptively in order to bring the most probable address codevectors into the active region. When encoding an address combination the active region of the address-codebook is checked, if such an address combination exists its index is transmitted to the receiver, otherwise the address of each block is transmitted individually. The performance (SNR value) of the proposed A-VQ method is the same as that of a memoryless vector quantizer, but the bit rate would be reduced by a factor of two when compared with a memoryless vector quantizer.© (1988) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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