Hello,All!
I use NI Vision to measure the protective film's boundary dimension for mobilephone screen glass,but the original image's contrast is very low(< 20) because of the protective film is too thin.When I use "Edge Detector" to find the edge,I must set the "min edge strength" to very low(almost 10) or I can't find the edge.The problem is,when the parameter is changed so small,the test result is very unstable ,often find the wrong edge.I think some image enhancement methods can improve the contrast,but I'm not familiar with this ,does anyone can give some suggestions?Best give me some image processing sample code according to the image in the my annex .Thanks very much!
