Abstract
Automated product inspection is a highly important issue in industrial manufacturing. A typical problem is the examination of structured surfaces of fabricated items in order to identify defects. Usually, one has to deal with ”endless” materials transported at high speeds, such as breadths of cloth, carpet, plastic foil, or the like. These materials possess a surface texture that is characterized by a certain global regularity but also by slight local variations of indeterministic nature. Fabrication errors can be identified as structures that violate the global regularity. An example for a common cloth texture carrying a typical fabrication error is depicted in the leftmost image of fig. 2. The examination procedure can be divided into the detection and the classification of defects. Whereas the primary goal of the detection is to localize all irregularities, the latter part refers to the distinction of different defect types.
© 1997 Optical Society of America
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