H - Electricity – 04 – N
Patent
H - Electricity
04
N
354/67
H04N 7/30 (2006.01) H04N 7/26 (2006.01)
Patent
CA 1296430
Abstract of the Disclosure: In an encoding system responsive to a sequence of coefficient signals which results from a predetermined linear transform and which is divided into a sequence of blocks, anterior processing is carried out prior to quantization about the coefficient signals in each block to determine a significant area of the coefficient signals by comparing each level of the coefficient signals with a threshold level. Only the coefficient signals within the significant area are judged to be valid and produced as a sequence of significant coefficient signals from a classifying circuit (20) to be quantized by a quantizer (15) into a sequence of quantized signals. The quantized signal sequence is subjected to posterior processing to produce a sequence of encoded signals. The significant area may be decided by the use of a selected one of zone detection, zigzag scanning, and adaptive scanning. In the posterior processing, the quantized signals may be encoded into the encoded signals by the use of a plurality of code sets or tables.
551379
Kaneko Masahide
Kato Yoichi
Koike Atsushi
Matsuda Kiichi
Mukawa Naoki
Corporation Nec
Fujitsu Limited
Kokusai Denshin Denwa Co. Ltd.
Nippon Telegraph & Telephone Corporation
Smart & Biggar
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