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Verfahren zum optischen Sortieren von Schuettgut

Process for the optical sorting of bulk material
: Graudejus, W.; Briem, E.; Haettich, W.; Geisselmann, H.

Frontpage ()

DE 1993-4345106 A: 19931228
DE 1993-4345106 A: 19931228
EP 1994-250285 A: 19941125
DE 4345106 C2: 19951123
EP 661108 B1: 19991103
US 5586663 A: 19961224
Patent, Electronic Publication
Fraunhofer IITB ( IOSB) ()

The invention relates to a process for the optical sorting of bulk material in a colour sorting machine, by which bulk material is conveyed over a conveyor belt and travels past an observation head comprising a light source and a product signal receiver arranged in proximity to the light source, whereby the reflected light of the pixels of the test material is divided into several spectral ranges by various colour filters of adjacent detection elements of a row of the receiver and the test material is sorted according to the colour values (measured value of intensity in each colour). In order to improve the detection rate, the invention foresees that in a test material containing reject parts, the colour values of the product are analyzed in several subranges by determining in each subrange a classifier for connecting areas of pixels with colour values occurring in each subrange and by performing a classification according to specified criteria consisting of the geometry and the size o f said detection areas.