Apparatus and methods for coding and storing raster scan images

Details Apparatus and methods for coding and storing raster scan images Apparatus and methods for coding and storing raster scan images

1984-04-17

1986-12-16

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 22, 382 26, 382 56, G06K 948

Patent

active

046303065

ABSTRACT:
In automatically checking circuit boards by raster scanning, it is useful to code and store conductor boundaries for later analysis. Coding time can be reduced by storing an identification of a chain of boundary segments in one of two arrays each time a boundary is detected in a scan line, the identification being stored at an address corresponding to the position of the segment detected. At the same time signals describing the segment are stored in another store at an address related to the identification. When in the next scan line a boundary segment is detected, an address corresponding to its position is used to address the said array and if an identification is found, the new segment is stored in the other store as part of the chain identified. In order to reduce the size of the other store signals describing segments are not stored in areas allocated to chains but in the next vacant location and a RAM stores links between segments.

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