Hi I'm trying to do a second derivative test to an image for the purpose of finding extrema. I just want to make sure whether these are true or not:
Dxx = D(x+1,y) + D(x-1,y) - 2D(x,y) Dyy = D(x,y+1) + D(x,y-1) - 2D(x,y) Dxy = D(x+1,y+1) + D(x+1,y-1) + D(x-1,y-1) + D(x-1,y+1) - 4D(x,y) Secondly, I'm trying to store all the extrema detected in a Nx2 array where N is the number of extrema, and 2 being the x and y coordinates of them. Since I don't know how many extrema will be detected, can we create an empty array in python without specifying the size, and later append the data to that array Thanks a lot _______________________________________________ Image-SIG maillist - [email protected] http://mail.python.org/mailman/listinfo/image-sig
