Apparatus for and method of transmitting video signal

Details Apparatus for and method of transmitting video signal Apparatus for and method of transmitting video signal

1993-05-12

1995-05-30

Britton, Howard W.

Television

Bandwidth reduction system

Data rate reduction

348405, 348408, 348419, 348423, H04N 730

Patent

active

054206367

ABSTRACT:
The video signal containing portions locally unsuitable for coding is divided into a plurality of components and is coded by a method such as a Wavelet transform and then is transmitted. In this case, a first quantizing means controls a quantization characteristic per block consisting of small area segments of coefficients composed of respective components to make uniform a distortion within the picture and a visual obstacle caused by the distortion. A second quantizing means controls the quantization characteristic to make uniform a deterioration quantity of the entire picture within a range of a predetermined coded data quantity. It is therefore possible to effect the transmission with a stable picture quality against a variety of fluctuations in the video signal inputted.

REFERENCES:
patent: 4969040 (1990-11-01), Gharavi
patent: 5014134 (1991-05-01), Lawton
patent: 5068911 (1991-11-01), Resnikoff

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