Efficient iterative decompression of standard ADCT-compressed im

Details Efficient iterative decompression of standard ADCT-compressed im Efficient iterative decompression of standard ADCT-compressed im

1994-12-05

1996-05-28

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358430, 358433, H04N 979

Patent

active

055217184

ABSTRACT:
A method of decompressing a document image compressed with JPEG ADCT and a subsequent statistical encoding method, includes an iterative processing step, which filters the image to correct for compression/decompression artifacts, and subsequently checks the ADCT coefficients of the filtered image to determine whether the filtered image is a possible one, given the received original ADCT coefficients and Q-Table description. In such an arrangement, the iterative process step can be terminated at a preselected number of iterations based on the measured size of the statistical encoding prior to removing the statistical encoding.

REFERENCES:
patent: 4999705 (1991-03-01), Puri
patent: 5001559 (1991-03-01), Gonzales et al.
patent: 5049991 (1991-09-01), Niihara
patent: 5321522 (1994-06-01), Eschbach
patent: 5321552 (1994-06-01), Eschbach
patent: 5359676 (1994-10-01), Fan
Chen et al; "Adaptive Coding of Monochrome and Color Images"; IEEE Trans. Comm.; vol. COM-25, No. 11, Nov. 1977; pp. 1285-1292.

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