In today's world, countless number of images are collected using various image acquisition devices. The course of actions taken to enhance the acquired image quality, to extract meaningful information from the acquired image, and to represent these information in a compact fashion is known as image processing. Digital image processing is the use of computer algorithms to perform image processing on digital images. A digital image is a numeric representation of a two-dimensional image. Depending on whether the image resolution is fixed, it may be of vector or raster type. The term "digital image" usually refers to raster images, also called bitmap images. With the fast computers and signal processors available since 2000, digital image processing has become the most common and cheapest form of image processing.