$(10+10$ p$.)$a$.$ Write the name of the image processing techniques applied to the images in the direction indicated by the arrows and numbered in the diagram below, and the type of operator or process used. All operations were performed in the image environment $($not in the frequency environment$).$b$.$ Write short Matlab codes that perform image processing techniques $1,2$ and $3($name the input image A and the output image B$,$ you do not need to read the images from the file and display them on the screen$).$