Encoding system capable of accomplishing a high efficiency by an

Details Encoding system capable of accomplishing a high efficiency by an Encoding system capable of accomplishing a high efficiency by an

1987-11-10

1990-03-13

Cangialosi, Salvatore

Cryptography

Particular algorithmic function encoding

358135, 3582611, 341 60, H04N 712, H04N 1419

Patent

active

049088629

ABSTRACT:
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.

REFERENCES:
patent: 3984626 (1976-10-01), Mounts et al.
patent: 4591909 (1986-05-01), Kuroda et al.
patent: 4723161 (1988-02-01), Koga
patent: 4734767 (1988-03-01), Kaneko et al.

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