Feature Extraction and Image Processing for Computer Vision, 4th Edition

3

Image processing

Abstract

We shall now start to process digital images. First, we shall describe the brightness variation in an image using its histogram. We shall then look at operations which manipulate the image so as to change the histogram, and at processes that shift and scale the result (making the image brighter or dimmer, in different ways). We shall also consider thresholding techniques that turn an image from grey level into binary. These are called single point operations. After, we shall move to group operations where the group is those points found inside a template. Some of the most common operations on the groups of points are statistical, providing images where each point is the result of, say, averaging the neighbourhood ...