Ahmad Affzan Abdullah wrote: > 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)
looks reasonable. > 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 any reason you cannot use a Python list for this ? </F> _______________________________________________ Image-SIG maillist - [email protected] http://mail.python.org/mailman/listinfo/image-sig
