Picture encoding apparatus

Details Picture encoding apparatus Picture encoding apparatus

1997-10-22

1999-03-23

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Reduced time or bandwidth for static image communication

3582611, 3582612, 3582613, 3582621, 358426, 382232, 382230, 382242, 382248, H04N 1419, H04N 1417, H04N 141, G06K 936

Patent

active

058867945

ABSTRACT:
A picture encoding apparatus and the method in which the quantization step width of the lower hierarchy data having a resolution higher than that of the upper hierarchy data is determined for each predetermined block of respective hierarchy data based on the quantization step width determined by the upper hierarchy data having a low resolution, so that the additional code indicating the characteristics of quantizer can be omitted thereby the compression efficiency can be improved and the deterioration of picture quality can be reduced when picture data is hierarchical-encoded.

REFERENCES:
patent: 4849810 (1989-07-01), Ericsson
patent: 5122873 (1992-06-01), Golin
patent: 5253075 (1993-10-01), Sugiyama
patent: 5282255 (1994-01-01), Bovik et al.
patent: 5351095 (1994-09-01), Kerdranvat

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