Digital data processing device

Details Digital data processing device Digital data processing device

1994-11-08

1998-01-13

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Reduced time or bandwidth for static image communication

358430, 358539, 382232, 382248, 382251, H04N 141, H04N 146

Patent

active

057085099

ABSTRACT:
A digital data processing device has a DCT processing circuit in which image data is discrete cosine transformed, so that DCT coefficients can be obtained. The DCT coefficients are quantized using a quantization table in a quantization processing circuit to obtain quantized DCT coefficients. The quantized DCT coefficients are inversely quantized by the quantization table in an inverse quantization processing circuit to obtain inversely quantized coefficients. Optimum quantization coefficients are obtained by determining a minimum value for the sum of the squares of differences between the DCT coefficients and corresponding inversely quantized coefficients. The image data are then encoded using a Huffman encoding processing circuit. The encoded image data and the optimum quantization coefficients are then recorded to a recording medium.

REFERENCES:
patent: 5384849 (1995-01-01), Jeong
patent: 5396567 (1995-03-01), Jass
patent: 5410351 (1995-04-01), Kojima
patent: 5412484 (1995-05-01), Yoshikawa

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