Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1995-03-03
1996-09-03
Rogers, Scott A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
395114, 358457, 358429, H04N 1405, H04N 1413
Patent
active
055532004
ABSTRACT:
An apparatus and method for providing bit-rate reduction and reconstruction of image data. Bit-rate reduction of 32-bit CMYK combinations into 16-bit code words is performed on a pixel by pixel basis by stepwise calculations or by using LUTs. Bit-rate reduction takes place during PostScript.RTM. interpretation where the output image pixels are generated in a possibly arbitrary order. Bit expansion from 16-bit code words to 32-bit data for 8 bits per component of the CMYK image values is performed while real time printing, preferably by direct table look up. During bit-rate reduction, the image data may be non-linearly corrected to compensate for perceptual non-uniformities and for non-linearities in the input/output relationship of the reproduction device. Quantization and coding may be accomplished by thresholding the non-linearly corrected image data by values from a dither array. The coded image is stored in the frame buffer and subsequently retrieved, de-dithered, dequantized and inversely transformed for the perceptual non-linearity before printing.
REFERENCES:
patent: 3244808 (1966-04-01), Roberts
patent: 4667251 (1987-05-01), Hasegawa
patent: 5111310 (1992-05-01), Parker et al.
patent: 5323247 (1994-06-01), Parker et al.
patent: 5341228 (1994-08-01), Parker et al.
patent: 5477305 (1995-12-01), Parker et al.
1992 Optical Society of America, J. Opt. Soc. Am. A/vol 9 No. 11, Nov. 1992, Mitsa, et al., "Digital Halftoning Technique Using A Blue-Noise Mask".
IRE Transactions on Information Theory, Roberts, "Picture Coding Using Pseudo Random Noise," Feb. 1962, IT-8, No. 2, pp. 145-154.
"The Void-And-Cluster Method For Dither Array Generation," by Robert Ulichney, Sep. 1993, Proceedings of the SPIE, vol. 1913, pp. 332-343.
Electronics For Imaging, Inc.
Rogers Scott A.
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