THE USE OF SCHLIEREN VISUALIZATION METHOD IN THE DIAGNOSTIC OF OPTICALLY TRANSPARENT POLYMERIC FOILS
Lívia Syrová - Rudolf Ravas -Ján Grman
The article concerns with the principles of the schlieren optical visualization method applied to the evaluation of the properties of optically transparent polyolefine foils. The quality of images is a very important assumption of the visual evaluation even when quantitative methods of description of foils images are used. In order to influence the final quality of the image gained by the visualization methods it is necessary to correct brightness inhomogeneity of the image. In this way we can gain images that are suitable for identification, comparison and defectoscopy of transparent polymeric foils. Statistical approach allows useful classification of different types of polyolefine foils into classes. The successfulness of classification was verified. Statistical methods allow to distinguish images of damaged foils that can be useful in defectoscopy. Experimental results and their statistical interpretation are presented as well.
Keywords: optical visualization, polymeric foil, image processing, classification, defectoscopy