After getting edge image using canny, what's the use of edge image?
Is there any use case of edge image?
find object and Segment it from image? or get the sharp,area and perimeter of the object?
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As in the wikipedia,
You can use this to find the interested area of an image by programmatically. For example, you have a lazer image of a indoor floor map and you want to detect the actual area a robot can visit, this will be useful. You can refer google more on this. It's just an example in real world usage.