Moving image coding apparatus moving image decoding apparatus an

Details Moving image coding apparatus moving image decoding apparatus an Moving image coding apparatus moving image decoding apparatus an

1996-10-10

1998-11-17

Britton, Howard

Television

Bandwidth reduction system

Data rate reduction

348402, 382248, H04N 750

Patent

active

058383786

ABSTRACT:
A moving image coding apparatus, a moving image decoding apparatus and a moving image coding-decoding apparatus suitable for use when a moving image is compressed and transmitted have a prediction error signal generating means for dividing an inputted image into blocks each consisting of plural pixels and computing a difference between the inputted image and a predicted image generated from a past inputted image to generate a prediction error signal, an amplitude modulating means for conducting amplitude modulation on an amplitude of each pixel of the prediction error signal at a predetermined modulation factor, a transforming means for transforming the prediction error signal having been undergone amplitude modulation in order to remove correlation among the pixels to generate a transform coefficient, a quantizing means for quantizing the generated transform coefficient, and a channel coding means for assigning a code to the quantized transform coefficient and outputting it, whereby a visually prominent error can be decreased over an entire block when the moving image is coded and decoded.

REFERENCES:
patent: 4224678 (1980-09-01), Lynch
patent: 5005082 (1991-04-01), Zdepski
patent: 5313298 (1994-05-01), Meeker

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