Picture coding apparatus using orthogonal transforms

Details Picture coding apparatus using orthogonal transforms Picture coding apparatus using orthogonal transforms

1997-08-29

2000-10-24

Rao, Andy

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

348405, 348404, 348403, 348402, H04N 718

Patent

active

061378356

ABSTRACT:
A picture coding apparatus includes a first compressing device for offset sampling input signals, and a second compressing device, having at an orthogonal transform circuit and a quantization device, for compressing the output from the first compressing device, wherein the quantization levels of the quantization device are set so that high-frequency components along a predetermined direction are quantized precisely on the basis of the visibility of each frequency component discriminated by orthogonal transform on a display screen.

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