I have 3 questions about image processing by using CImg (C++).
Open image and check pointer mouse of position on image. Then check action mouse that if you click or click and draw line, the line will appear from mouse position.
Open image in a new window and select the one with the mouse 2 points (not the same). Next, crop an image from the two points, and then show it in a new window.
Open the image in a window, dividing the area of the image to a size of 3x3. Then show a new which caused the original image in each of the images that share must have conversion of convolution. Don't forget to comment in code that what convolution tecnique that you use.