How can exactly detect the edge line of the image?

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jasmine htwe
jasmine htwe 2018-2-28
回答： Image Analyst 2018-3-2
To extract ROI exactly, I need to detect the edge line of image. Firstly, I used sobel edge detection, but this cannot detect exactly the edge line. So, I used the thresholding for my images. Although this can detect most images, there are some remaining images cannot correctly detect the line. I also use morphological (dilate,erode,etc). But still there is disconnected edge lines. So, please could you help me some suggestions or codes for my problem? I want to get the edge line (e.g 3.bmp).

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回答（1 个）

Image Analyst
Image Analyst 2018-3-2
I don't think you need edge detection. Why not just invert the images and use bwboundaries(), or scan column by column using find() to find top and bottom edges as a function of column number?

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