Image signal processing device

Details Image signal processing device Image signal processing device

1994-07-15

1996-03-05

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Reduced time or bandwidth for static image communication

358430, 358432, 348403, 348404, 348405, 382248, 382250, 382251, 382252, H04N 141, H04N 1102, G06T 900

Patent

active

054972469

ABSTRACT:
A DCT processing circuit outputs DCT coefficients based on image data stored in an image memory. The DCT coefficients are quantized by a quantization processing circuit, then input to a Huffman encoding processing circuit and an inverse quantization processing circuit. In the inverse quantization processing circuit, the DCT coefficients are reproduced. The differences between the reproduced DCT coefficients and the DCT coefficients output from the DCT processing circuit are determined as the quantized error data by subtractors. An error data synthesizing unit stores the error data in a fourth component of a JPEG format and inputs the error data to the Huffman encoding processing circuit. The output signals of the quantization processing circuit and the output signals of the error data synthesizing unit are Huffman encoded and recorded to an IC memory card.

REFERENCES:
patent: 5349383 (1994-09-01), Parke et al.

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