Method and system for line-thinning in electronic image processi

Details Method and system for line-thinning in electronic image processi Method and system for line-thinning in electronic image processi

1985-09-19

1987-05-12

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

382 55, 358260, H04N 1415, G06K 944

Patent

active

046654410

ABSTRACT:
To achieve high speed line-thinning, an electronic picture to be processed is divided into sections, and the scanning for line-thinning is performed for each section. If no point removal is performed in the scanning of a section, the line-thinning is completed for that section. When points are removed in the scanning, incomplete areas that require further line-thinning are determined based on positions where the points are removed. In the next scanning, scanning for line-thinning is not performed for all of the sections, but is done for areas within sections that contain the incomplete areas. These areas are smaller than the sections and are variably determined according to the size of their incomplete area. Thus, the area to be scanned is reduced and dynamically controlled. It is because the incomplete areas become smaller and smaller as the scanning is repeated, that the area variably determined according to the size of the incomplete area also becomes smaller. The condition to terminate all processes for line-thinning occurs when it is determined that the line-thinning is completed for all sections after checking all of them.

REFERENCES:
patent: 3975709 (1976-08-01), Beun
patent: 4034344 (1977-07-01), Saraga
patent: 4454542 (1984-06-01), Miyazawa
patent: 4461029 (1984-07-01), van Bilzem

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