Image analysis – Image compression or coding – Quantization
Patent
1997-05-14
1999-03-09
Chang, Jon
Image analysis
Image compression or coding
Quantization
382250, 348401, 348405, 341200, 36472503, 364765, H04N 900
Patent
active
058811770
ABSTRACT:
A quantizer for quantizing scanned DCT coefficients in a video encoder is disclosed. The quantizer comprises a memory having a first bank with a plurality of areas for storing an inter quantization matrix and a second bank with a plurality of areas for storing an intra quantization matrix; a memory controller for generating a write address for writing the inter quantization matrix and the intra quantization matrix in the memory in an order of zigzag scanning manner, and a read address for reading a corresponding quantization matrix from the memory in an order of a scanning manner of the DCT coefficients, and controlling a write/read operation of the inter quantization matrix and the intra quantization matrix in the memory according to the write address and the read address; an arithmetic controller for obtaining a reciprocal value of the corresponding quantization matrix from the memory via the memory controller and a reciprocal value of a quantization scale provided externally and outputting the obtained value; and an arithmetic unit for quantizing the scanned DCT by using the reciprocal values of the corresponding quantization matrix and the quantization scale. Thus, a corresponding quantization matrix can be read from a memory without data collision, in accordance with scanned manner of DCT coefficients.
REFERENCES:
patent: 4884265 (1989-11-01), Schroeder et al.
patent: 5012438 (1991-04-01), Yamaguchi
patent: 5295077 (1994-03-01), Fukuoka
patent: 5410352 (1995-04-01), Watanabe
patent: 5537147 (1996-07-01), Tahara
patent: 5563593 (1996-10-01), Puri
patent: 5617094 (1997-04-01), Kim
patent: 5623311 (1997-04-01), Phillips et al.
Chang Jon
Daewoo Electronics Co. Ltd.
Rosenblum David J.
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