Apparatus and method of attenuating distortion introduced by a p

Details Apparatus and method of attenuating distortion introduced by a p Apparatus and method of attenuating distortion introduced by a p

1987-04-24

1988-11-15

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358133, 358135, 358282, H04N 1417

Patent

active

047853565

ABSTRACT:
The present invention relates to a predictive coding method and related apparatus which (a) computes a value D representing the difference between an original graylevel value for a current pixel and a predicted value for the current pixel; (b) associates each successive range of D values to a respective quantization level, each quantization level QN having a respective QN value representing the range corresponding thereto; (c) sets a respective QERR value to D for the current pixel, when the QN value is zero; (d) re-maps m QERR values to n (n.ltoreq.m) MERR values; (e) assigns to the value MERR=O those QERR values in which .vertline.QERR.vertline..ltoreq.(+Q1 VALUE)/2 sums the MERR values for successive pixels in a QN=QO region; and (f) adjusts the QN value from the value of QO by the value of Q1 for a pixel at which the summed value reaches a predefined threshold. QN values, adjusted as appropriate, are subjected to entropy coding compression and decompression. In the decompression process, pixel values are reconstructed. According to the invention, the reconstructed values are subjected to a vertical filter in which a pixel having a reconstructed value I.sub.0 is filtered to have a value

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