Pictures, puzzles, and patches

摘要

What is an image? Most dictionaries definenan image as the counterpart of an object pro-nduced by an optical device. For example, annimage of this page is formed on your retina,nand your brain interprets this image so thatnyou can read the text. If you want to extractnadditional information about this image,nyour biological imaging system needs helpnfrom additional image analysis tools. A dig-nital counterpart to your eyes isnthe charge-coupled devicen(CCD) camera. Informationnfrom digital camera images isnstored in pixels in the form of anmatrix, and each pixel containsninformation about light inten-nsity and X, Y coordinates.