title: What is the significance of the eigenvalues of an autocorrelation matrix in image processing?
body: <p>I am working on finding corner points using the Harris corner detection algorithm. A reference paper that I am reading suggested me to examine the eigenvalues of the autocorrelation matrix.  However, I don't understand how corner points are related to the eigenvalues of the autocorrelation matrix.  What is this relationship between them?</p>