Abstract: Due of high requirements for operators’ visual ability and experience, loop linking becomes the bottle neck of sweater knitting. In order to realize automatic and intelligent loop linking, simulating the key process of web alignment in the manual operations and establishing one software system of controlling alignment based on computation vision is proceeded. Three creative points occupy in that software system: (1) Using line detection to avoid traditional stereo visual computation framework, as simplified system designing complexity; (2) Unorderly lines filter guaranteeing the extraction of parallel lines; (3) Number counter based on clustering recognizing the precise number of graduation marks. The system runs online with recognition of web alignment in two sides wisely, proving the feasibility of visual-control based linking machine.

Key words: linking machine, line detection, visual-control, clustering