how can we extract edge and corner from the gray scale image?

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Raman
Raman el 3 de Feb. de 2013
is there any inbuilt function for the same?

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Image Analyst
Image Analyst el 3 de Feb. de 2013
Yes. Believe it or not, they're called edge() and corner(). Who'd have thought it? Did you try to look in the help by entering any search terms? You'll find more info there in the help.

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