Image-processing can be described as any signal processing for which the input is an image. Some images have defects such as noise or blur which needs specific processing to improve the image. There are several categories of image processing which includes enhancement, restoration, segmentation, registration, compression and pattern recognition. For a photographer, the use of image-processing technique is important to enhance the contrast, brightness, edges, sharpness or smoothing. In medical application, a radiotherapist uses image processing to conduct analysis and restore the region of interest. The image to be processed can be either a coloured image, a grayscale image or a black and white image. Thermogram image is a coloured image, produced by the thermal camera. The colour distribution in the thermogram is based on the heat distribution. Light colours indicate the hot region of heat distribution and dark colours indicate the cool region. Thermograms are used in various applications such as in military, building inspection, firefighting, and search and secure mission
