On Thu, Apr 17, 2008 at 6:54 PM, Zachary Pincus <[EMAIL PROTECTED]> wrote: > Hi, and thanks for the suggestion! > > > > How many bits per pixel does your camera actually generate !? > > If its for example a 12 bit camera, you could just fill in directly > > into 4096 preallocated bins. > > You would not need any sorting !! > > That's what I did for a 16 bit camera -- but I wrote it in C and I had > > 4 cameras at 30 Hz. > > That approach avoids the bin-index calculation line: > indices = numpy.clip(((array.astype(float) - min) * bins / (max - > > min)).astype(int), 0, bins-1) > > But even if indices = array, one still needs to do something like: > for index in indices: histogram[index] += 1 > > Which is slow in python and fast in C. > > I'm guessing that there's no utility function in numpy that does a > loop like this? If so, that would be handy, but if now, I think I need > to dig out the numpy book and write a little extension... > > I thought of a broadcasting approach... what are the chances that a simple
bins[:] = 0 bins[ img.flat ] += 1 works !? Or something along those lines .... -Sebastian _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
