Use the program called harris-shell.c and add some code to find the corners in the image checkers.jpg. You should say that a pixel in the image is a corner if it passes the given threshold for Harris Corners. You do not need to thin the corners using non-maxima suppression. You should draw a small circle or dot on these corner pixels, and then save the resulting image. The final image should look similar to Corner-out.pgn. You need to look up the formula to find the eigenvalues of a real, symmetric, two by two matrix.