Jon N. Hasselgren

Image Processing Techniques

Image processing includes those methods that operate on arrays of pixels to produce a modified image in which some of the information is enhanced in visibility and necessarily some other information is reduced. This is done presumably because the user can determine from the intended use of the image which information is currently important. In other situation, different processing might be used to extract other information from the image. There are several different ways to organize image processing methods to aid in understanding and to provide a logical structure for explanation. One is by purpose: to correct defects in images that arise from imperfect cameras, illumination, etc; to enhance the visibility of particular structures within images; to recognize and locate features; etc. In many cases, the same tools can be used for several of these different objectives. Another method is to distinguish between operations that work on single pixels, within small neighborhoods, and globally on the entire image. This article discussed single-pixel operations. Keywords: image processing; single pixel; operations; neighborhood operations; ranking; edge enhancement; texture; combinations; thresholding; frequency domains; convolution; correlation