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

fYear

1992

fDate

30 Aug-3 Sep 1992

Firstpage

425

Lastpage

428

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICPR.1992.201591

Filename

201591