Lossless transform coding system for digital signals

Details Lossless transform coding system for digital signals Lossless transform coding system for digital signals

1996-09-27

1998-08-04

Ngo, Chuong Dinh

Boots, shoes, and leggings

36472503, G06F 1714

Patent

active

057904413

ABSTRACT:
The invention provides a reversible eight-element discrete cosine transform system which can be realized with a practical circuit and provide transform values proximate to those obtained by actual eight-element discrete cosine transform. In 4.times.4 matrix transform which appears when eight-element discrete cosine transform is decomposed in accordance with a high speed calculation method, transform values (X.sub.1, X.sub.7, X.sub.3, X.sub.5) are divided into (X.sub.1, X.sub.7) and (X.sub.3, X.sub.5), and if (X.sub.1, X.sub.7) are determined, then possible values as (X.sub.3, X.sub.5), are limited. This is utilized for quantization of the elements. (X.sub.1, X.sub.7) are quantized with step sizes of k.sub.1 and k.sub.2 by operators to obtain quantization values (Q.sub.1,) Q.sub.7). Meanwhile, from (X.sub.3, X.sub.5), global quantization values are obtained by a quantizer using a conventional reversible quantization technique while local quantization values are obtained using a second numerical value table, and quantization values (Q.sub.3, Q.sub.5) are obtained from the values of the gloval quantization values and the local quantization values. Then, an eight-element discrete cosine transform system is constructed by a combination of reversible transform quantization of a 4.times.4 matrix and conventional reversible transform quantization of a 2.times.2 matrix.

REFERENCES:
patent: 4862263 (1989-08-01), Strobach et al.
patent: 5408425 (1995-04-01), Hou
patent: 5590066 (1996-12-01), Ohki
patent: 5621676 (1997-04-01), Iwata
patent: 5703799 (1997-12-01), Ohta

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