The purpose of the function is to compare two images and "mark" the differences. The function call should have the syntax:
newimage = immark(image1, image2)
image1: An image matrix – not the filename.
image2: An image matrix that is very similar to the initial image, but with one or more differences
Copy image2 to newimage. Compare image1 to image2. When a difference is found, clearly mark the difference in newimage. Mark with an X or circle the difference.