Device for and method of detecting positioning marks for cutting

Details Device for and method of detecting positioning marks for cutting Device for and method of detecting positioning marks for cutting

1991-11-21

1993-08-03

Razavi, Michael T.

Image analysis

Histogram processing

For setting a threshold

382 1, 358101, G06K 980

Patent

active

052336697

ABSTRACT:
A device for detecting positioning marks for cutting a ceramic laminated body having a plurality of inner electrodes formed therein and having a plurality of positioning marks for cutting so formed on its outer side surfaces as to have a predetermined positional relationship with the inner electrodes, which comprises a device for detecting image information obtained from the outer side surfaces of the ceramic laminated body, a binary-coding device for binary-coding the image information detected by the detecting device based on a color density, an image memory for storing the image information binary-coded by the binary-coding device, a characteristic extractor for extracting signal regions having a color density not less than a predetermined color density from the image information stored in the image memory, removing regions having an area not more than a predetermined area and regions having a length in the lateral direction not less than a predetermined length out of the signal regions extracted, and selecting the remaining regions as candidates for positioning marks for cutting, and a middle point calculating device for calculating a middle point of the positioning marks for cutting on the basis of the candidates for positioning marks for cutting obtained by the characteristic extractor.

REFERENCES:
patent: 4167677 (1979-09-01), Suzki
patent: 4348592 (1982-09-01), Kimura et al.
patent: 4655598 (1987-04-01), Murakami et al.
patent: 4807296 (1989-02-01), Ando et al.
patent: 5058178 (1991-10-01), Ray
patent: 5058181 (1991-10-01), Ishihara et al.
patent: 5086478 (1992-02-01), Kelley-Mahaffey et al.

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