In image processing, it is common to have a processing function that computes a value at each pixel location based on the value of the neighboring pixels. When this neighborhood includes pixels of the previous and next lines, you then need to scan several lines of the image simultaneously. This recipe shows you how to do it.
Scanning an image with neighbor access
Getting ready
To illustrate this recipe, we will apply a processing function that sharpens an image. It is based on the Laplace operator (which will be discussed in Chapter 6, Filtering the Images). It is indeed a well-known result in image processing that if you subtract its Laplacian from an image, the image edges are amplified, thereby giving a sharper image. This...
