1 July 1989 Interframe Hierarchical Vector Quantization
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An interframe hierarchical vector quantizer (IHVQ) is presented that is capable of encoding image sequence scenes at rates below 0.3 bit per pixel per frame. A regular decomposition quadtree method is used to segment the interframe differential signal into homogeneous regions of different block size. Small blocks representing high contrast moving boundaries (i.e., the impulsive component of the difference signal) are vector quantized, whereas large blocks typically representing smooth regions of the image are encoded by the local sample mean of the region. The IHVQ system has a signal-to-noise ratio (SNR) at least 2 dB higher than the SNR of the interframe mean-reconstructed quadtree coding system.
Nasser M. Nasrabadi, Shihkuan E. Lin, Yushu Feng, "Interframe Hierarchical Vector Quantization," Optical Engineering 28(7), 287717 (1 July 1989). https://doi.org/10.1117/12.7977028

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