Title :
Extraction of grid patterns on stamped metal sheets using mathematical morphology
Author :
Tuzikov, A. ; Soille, P. ; Jeulin, D. ; Bruneel, H. ; Vermeulen, M.
Author_Institution :
Centre de Morphologie Math., Ecole Nat. Superieure des Mines de Paris, Fontainebleau, France
fDate :
30 Aug-3 Sep 1992
Abstract :
To validate models of sheet metal forming processes, experiments with sheets of metal marked with grids are performed. A method for measuring the deformed grid after processing is presented. It is based on morphological image processing and it requires four steps. A large top hat transformation is first applied to homogenize the grey level intensities of the background. The two main directions of the grid are then determined by calculating covariances. Linear filtering along the directions of the grid is used to extract a mask of the grid pattern. This mask is then skeletonized in order to extract the medial axis of the grid as well as its intersection points
Keywords :
computerised pattern recognition; computerised picture processing; filtering and prediction theory; forming processes; mechanical engineering computing; metalworking; covariances; grid medical axis; grid pattern extraction; intersection points; linear filtering; mask skeletonization; mathematical morphology; sheet metal forming processes; stamped metal sheets; top hat transformation; Charge coupled devices; Charge-coupled image sensors; Fires; Frequency; Glass; Ice; Morphology; Optical reflection; Predictive models; Steel;
Conference_Titel :
Pattern Recognition, 1992. Vol.I. Conference A: Computer Vision and Applications, Proceedings., 11th IAPR International Conference on
Conference_Location :
The Hague
Print_ISBN :
0-8186-2910-X
DOI :
10.1109/ICPR.1992.201591
