From the very beginning of the concept of image processing, the researchers took the challenge of image enhancement process as an important focus since enhancing an image would result in improvement in the image quality. Image has to be enhanced prior to any mentioned processing. An optimal Enhancement technique should enhance both high quality and low quality images, and should highlight even small details hidden in the image. Infrared image enhancement refines the details immerged in the background and provide a noise free image as output. This paper was aimed to discuss and analyze about various image enhancement techniques and filters that are used to enhance the quality of the given input image. © 2014 IEEE.