Image analysis – Image compression or coding – Quantization
Patent
1997-09-19
1999-08-24
Tran, Phuoc
Image analysis
Image compression or coding
Quantization
382233, G06K 936, G06K 938, G06K 946
Patent
active
059434473
ABSTRACT:
A video signal encoding and/or decoding method based on adaptive lattice quantization. An input frame of a video sequence is partitioned into blocks of pixel data called vectors. The set of the vectors is partitioned into blocks called macroblocks. The vectors in each macroblock are subjected to lattice vector quantization which examines the range of vector components in multiple dimensions and adjusts the density of lattice vectors in accordance with the range of vector components. Quantization unit replaces each input vector for a nearest lattice vector in multidimensional space. Each quantized vector in the macroblock is converted into an index of a lattice vector. An overhead information about the range in a macroblock and set of indices with or without subsequent Huffman or Arithmetic coding is transmitted to or stored in the receiver end.
REFERENCES:
patent: 5150209 (1992-09-01), Baker et al.
J.H. Conway et al., "Fast Quantizing and Decoding Algorithms for Lattice Quantizers and Codes," IEEE Transactions on Information Theory, vol. IT-28, No. 2, Mar. 1982, pp. 227-232.
Jang Euee-seon
Shin Jae-seob
Tkhor Vadim B.
Samsung Electronics Co,. Ltd.
Tran Phuoc
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