[Numpy-discussion] image correlations

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? John Hunter