Image analysis – Histogram processing – For setting a threshold
Patent
1981-04-13
1984-01-03
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
235454, 382 46, 382 61, G06K 932
Patent
active
044245874
ABSTRACT:
The invention relates to a method and apparatus for identifying objects (e.g. consumer products in a supermarket) appearing in random positions and orientations and for random times on an image window and having an identification on the surface facing the image window in the form of a data field having contrasting indicia in at least one data track. The data field is first scanned with a scanning raster until a product identification code is recognized denoting the position and orientation of the data track. The data track is then read with a closely-spaced reading raster and converted to a videosignal. The amplitude of the videosignal is coded into binary digits at discrete time points and the digits are stored in a memory matrix organized into columns and rows in such a manner that an image of the data track is stored in the memory. Mutually overlapping partial regions of the memory are then read out in a pre-arranged sequence and fed to a decoder capable of accepting and decoding the information in this form. In this way, the information is converted from a row-by-row sequence produced by the reading raster into a succession of digits corresponding to individual partial regions of the data track for the recognition of individual symbols appearing therein.
REFERENCES:
patent: 3553437 (1971-01-01), Boothroyd
patent: 3603728 (1971-09-01), Arimura
patent: 3701098 (1972-10-01), Acker
patent: 3766520 (1973-10-01), Patterson
patent: 3847346 (1974-11-01), Dolch
patent: 3852573 (1974-12-01), Dolch
patent: 3925760 (1975-12-01), Mason et al.
Scholze Hans
Sturm Bernhard
Wevelsiep Klaus
Boudreau Leo H.
Scantron GmbH & Co. Elektronische Lesegerate KG
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