Method and apparatus for locating the boundary of an object

Details Method and apparatus for locating the boundary of an object Method and apparatus for locating the boundary of an object

1983-02-28

1985-08-27

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 6, G06K 948

Patent

active

045382999

ABSTRACT:
An apparatus and method for automatically locating the boundary of an object in a field of view has a raster scan device to generate an electrical image of the field of view. The electrical image is segmented and digitized to form a first representation. The image is then processed by comparing the digitized signal to a pre-set threshold to form a second representation. A converter combines each value of the pixel of the second representation with the values of the adjacent pixels into a single value and stores it in a corresponding location in a third representation. The values of the pixels in the third representation are read out and compared to a look-up table. A chain code of the boundary of the particle is formed from the look-up table.

REFERENCES:
patent: 3899771 (1975-08-01), Saraga et al.
patent: 4003024 (1977-01-01), Riganati et al.
patent: 4060713 (1977-11-01), Golay
patent: 4087788 (1978-05-01), Johannesson
patent: 4097845 (1978-06-01), Bacus
Batchelor et al., "Fast Generation of Chain Code" IEE Proc., vol. 127, Pt. E, No. 4, Jul. 1980, pp. 143-147.

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