Abstract: A method and a system for detecting consignments or items which cannot be conveyed by a conveying system cost-effectively detect non-conveyable items for a materials handling system. A conveyor section and a light grid or curtain or comparable measuring assembly are configured and disposed in such a way that a consignment or item can be conveyed on the conveyor section through the light grid or curtain, so that a data structure characterizing the consignment or item can be generated by the light grid or curtain and fed into the detection system. The detection system is adapted to judge whether the consignment or item is conveyable or not based on the data structure.

Abstract: The invention concerns a method and device for binarization of pixel data in which a number of black-and-white binary images each having binarization characteristics of different degrees of sensitivity is formed from a set of grey scale value binary data. A dimension S is calculated for each of these binary images, according to the equation ##EQU1## where FS designates the number of black binary pixels and U designates the number of black-and-white transitions. A selection of the binary image for which the dimension S is at its maximum is optimally carried out.