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A brief summary of digital image enhancement

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Department of Computer Science
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  • Qa75 Electronic Computers. Computer Science

Abstract

-Research report 126 Department of Computer Science University of Warwick Coventry CY47 AL United Kingdom A BRIEF SUMMARY OF DIGITAL IMAGE ENHANCEMENT Gu Yun Qiang (RR126) Digital image processing is a modern branch of computer application. With the help of computers the visual quality of original images which were blurred by external interferences or optical transfer function of transmission channel can be improved so that the human eye can obtain more authentic information from the processed image. The major research objectives of digital image processing are image enhancement, image restoration, image encoding, image segmentation and image description. May 1988 A Brief Summary of Digital Image Enhancement GuYun Qiang Department of comPuter science University of Warwick CoventrY CY47N- ABSTRACT Digital image processing is a modem branch of computer application.With the help of computers the visual quality of original images which were blurred by extemal interferences or optical transfer function of transmission channel can be improved so that the human eye can obtain more authentic information from the processed image.The major research objectives of digital image processing are image enhancement,image restoration, image encoding,image segmentation and image description. Image Enhancement The principal objective of image enhancement is to strengthen some information of the original image for a specific application.Because of the variety of the different sorts of images there is no general theory and approach for enhancing pictures.A image which has such low contrast that it is barely visible,for example,by using histogram modification techniques its contrast can be improved.The results of applying a lowpass filter is image smoothing. Image sharpening can be achieved in the frequency domain by a highpass filtering process. Histogram Modification Techniques A histogram is a statistical figure which shows the graylevel distribution of the pixels in a image.A narrow r

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