Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-08-28
1993-09-07
Kostak, Victor R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358135, H04N 713
Patent
active
052434206
ABSTRACT:
An image encoding apparatus which is capable of keeping a quality of an encoded image even though a part of information is lost on a communication network, includes a unit (36) for quantizing transform coefficients and for outputting a quantized output signal and a quantized error signal, a unit (37) connected to the quantizing unit (37) for controlling a quantizing level used in the quantizing unit (37) so that the transform coefficients are quantized in accordance with the controlled quantizing level, an error quantizing unit (38) connected to the quantizing unit (36) for quantizing the quantized error signal output from the quantizing unit (36), and an error encoding control unit (39) connected to the error quantizing unit (38) for controlling a requantizing level used in the error quantizing unit (38) so that the quantized error signal is requantized in accordance with the controlled requantizing level.
REFERENCES:
patent: 4723161 (1988-02-01), Kaga
patent: 4933761 (1990-06-01), Murakami et al.
patent: 5025482 (1991-06-01), Murakami et al.
patent: 5113255 (1992-05-01), Nagata et al.
Conlin David G.
Kostak Victor R.
Neuner George W.
Sharp Kabushiki Kaisha
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