ABSTRACT
This chapter studies a set of simple "point by point" mathematical operators applicable to grayscale images and illustrate them with possible applications. Point processing is the simplest type of algorithms encountered in the field of image processing. As illustrated here, it can be used to enhance the luminosity and contrast of images, perform boolean operations between binary shapes, compute classical mathematical operations by pixels. Finally, a concrete application is presented by hiding secret messages in images using steganography.
