Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1983-05-26
1986-02-11
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358101, 382 8, 382 22, H04N 718
Patent
active
045701806
ABSTRACT:
Method and apparatus for automatic optical inspection of a substantially two-dimensional pattern using digital image processing techniques are described. In a first processing step, all regions of a digitized stored image derived from the two-dimensional pattern are scanned for edges or lines, that is, transitions between regions having optically different characteristics. The scanned edge regions are marked in the image storage. In a subsequent second processing step all non-marked regions of the image storage are scanned and tested for the presence of permissible grey levels. A meander-shaped scanning track is used for scanning the edge or lined regions. The apparatus for implementing this method includes special latch circuitry for eliminating the further processing of marked regions, thus increasing the overall speed at which the two-dimensional pattern can be optically inspected.
REFERENCES:
patent: 4056716 (1977-11-01), Baxter et al.
patent: 4059787 (1977-11-01), Aimar
patent: 4194113 (1980-03-01), Fulks
patent: 4295198 (1981-10-01), Copeland et al.
patent: 4345312 (1982-08-01), Yasuye
patent: 4402055 (1983-08-01), Lloyd
Th. Ricker & J. Schurmann "Mask and Pattern Inspection Systems"-NTG Fachberichte, vol. 60 (1977) pp. 229-234.
Baier Heinz
Kopp Peter
Pfeffer Erwin
Reimann Hans-Peter
Rosch Hans
Britton Howard W.
International Business Machines - Corporation
Levy Mark
McDowell Barbara A.
Villella Joseph F.
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