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STILL IMAGE COMPRESSION USING THE JPEG STANDARD

Platform : DSP

AIM: TO UNDERSTAND AND UTILIZE JPEG STANDARD FOR IMAGE COMPRESSION. ABSTRACT A joint ISO/CCITT committee known as JPEG (Joint Photographic Experts Group) has been working to establish the first international compression standard for continuous-tone still images, both grayscale and color. JPEG's proposed standard aims to be generic, to support a wide variety of applications for continuous-tone images. To meet the differing needs of many applications, the JPEG standard includes two basic compression methods, each with various modes of operation. A DCT (discrete cosine transform)-based method is specified for `lossy' compression, and a predictive method for `lossless' compression. JPEG features a simple lossy technique known as the Baseline method, a subset of the other DCT-based modes of operation. The Baseline method has been by far the most widely implemented JPEG method to date, and is sufficient in its own right for a large number of applications. The author provides an overview of the JPEG standard, and focuses in detail on the Baseline method LEARNING OBJECTIVE: Optimized compression of the Image based on JPEG standard INPUT: Raw Image OUTPUT : Compressed version of the Image APPLICATIONS: To save the transmission time and to enhance data rate over the network. To save the network over heads and to increase the network efficiency. SOFTWARE TOOL USED : MATLAB 2007A

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