Processing of gray scale image pels to facilitate data compressi

Details Processing of gray scale image pels to facilitate data compressi Processing of gray scale image pels to facilitate data compressi

1984-02-21

1986-07-08

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358280, 358284, H04N 140, H04N 1419

Patent

active

045996563

ABSTRACT:
A process is described for identifying those pels in a gray scale image which are candidates for vertical filtering before the image is thresholded to binary or black/white pel values. The vertical neighbor pels of a pel below a run end point are examined to determine whether their gray scale values fall within the same range. If they do, the horizontal neighbors of the current pel are examined to see whether their gray scale values fall in different ranges. If they do, the pel is vertically filtered by adjusting its gray scale value as a function of the differences between its value and the values of its vertical neighbors. Because only selected pels are vertically filtered, the process can be carried out with a general purpose microprocessor rather than a special purpose parallel processor.

REFERENCES:
patent: 4280144 (1981-07-01), Bacon
patent: 4498104 (1985-02-01), Schulz
patent: 4504864 (1985-03-01), Anastassiou et al.
patent: 4532651 (1985-07-01), Pennebaker, Jr. et al.

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