From: Todd M. <jm...@st...> - 2004-05-21 19:49:14
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On Fri, 2004-05-21 at 15:01, John Hunter wrote: > I have a series of luminance images that I want to do some correlation > analyses on. Each image is an MxN frame of a movie. I want to > compute the correlation between a given pixel i,j, and every other > pixel in the image over each frame. That is, if I assume > xij is a numFrames length time series, and xkl is another numFrames > length time series (the pixel intensities at two points in the image > over time), I want to compute the > > corrcoeff(xij, xkl) for every kl with ij fixed. > > I know I could do this by looping over the pixels of the image, but > I'm hoping for something a bit faster. > > Any suggestions? For numarray try numarray.convolve.correlate2d and set fft=1. Todd |