Image signal encoding apparatus and method for controlling quant

Details Image signal encoding apparatus and method for controlling quant Image signal encoding apparatus and method for controlling quant

1991-08-29

1993-08-31

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Facsimile memory monitoring

358133, H04N 712

Patent

active

052414019

ABSTRACT:
An image signal encoding apparatus having a control means for detecting a degree of redundancy of an inputted image signal and for conducting frame skip control based on a frame skip number determination and a determined skip number, an encoding processing means for processing a frame signal indicated by a transmission from said control means by block units into which a screen is divided, quantizing this signal, and encoding and outputting this signal through the medium of a transmission buffer, and a step size control means for controlling the step size of the quantization, characterized in that the step size control means comprises a correction buffer amount calculation means, which calculates a correction buffer amount indicating an excess in the transmission buffer from the frame skip number and a previously supplied transmission speed, and a step size calculation means, which outputs a quantization step size which is smaller as the correction buffer amount indicates a larger excess of the transmission buffer.

REFERENCES:
patent: 4894713 (1990-01-01), Delonge et al.
patent: 4951140 (1990-08-01), Ueno et al.
patent: 5089888 (1992-02-01), Zdepski et al.
patent: 5126842 (1992-06-01), Andrews et al.

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