MATLAB: How to inner product two images……

Question

inner product two images and then if each pixel value is greater than some threshold level put '1' in the pixel or else if it is zero then put '0'

Answer 1

I don't know what inner product has to do with it, but for the latter half of your question, you're describing thresholding. So to do that you do this:

binaryImage = grayImage > thresholdValue;