The purpose of this system (Fig. 1) is to locate accurately two pieces of fabric lying on a table. The pieces are laid down on the table with an orientation accuracy of ±12° degrees and cartezian shift up to 30 mm. The location of the two pieces is then tranfered to a robot arm that will pick them up as a matched pair and trnasfer them as such to an automatic sewing machine.
"A Vision System For Localization Of Textile Pieces On Light Table", Proc. SPIE 1038, 6th Mtg in Israel on Optical Engineering, (5 July 1989); doi: 10.1117/12.951052; https://doi.org/10.1117/12.951052