Bayers - CHAPTER I INTRODUCTION 1.1 Overview Data...

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CHAPTER I INTRODUCTION 1.1 Overview Data compression is the process of converting data files into smaller files for efficiency of storage and transmission. As one of the enabling technologies of the multimedia revolution, data compression is a key to rapid progress being made in information technology. It would not be practical to put images, audio, and video alone on websites without compression. Now let us elucidate the concept of image compression and the necessity of it. Many people might have heard of JPEG (Joint Photographic Experts Group) and MPEG (Moving Pictures Experts Group), which are standards for representing images and video. Data compression algorithms are used in those standards to reduce the number of bits required to represent an image or a video sequence. Compression is the process of representing information in a compact form. Data compression treats information in digital form that is, as binary numbers represented by bytes of data with very large data sets. Fox example, a single small 4″ × 4″ size color picture, scanned at 300 dots per inch (dpi) with 24 bits/pixel of true color, will produce a file containing more than 4 megabytes of data. At least three floppy disks are required to store such a picture. This picture requires more than one minute for transmission by a typical transmission line (64k bit/second ISDN). That is why large image files remain a major bottleneck in a distributed environment. Although increasing the bandwidth is a possible solution, the relatively high cost makes this less attractive. Therefore, compression is a necessary and essential method for creating image files with manageable and transmittable sizes. In order to be useful, a compression algorithm has a corresponding decompression
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This note was uploaded on 02/24/2012 for the course ECC 401 taught by Professor Awtar during the Spring '12 term at Punjab Engineering College.

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Bayers - CHAPTER I INTRODUCTION 1.1 Overview Data...

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