Image Compression and Coding

Abstract

SynonymsVisual data compressionDefinitionImage compression deals with reducing the amount of data required to represent a digital image by removing of redundant data.IntroductionImages can be represented in digital format in many ways. Encoding the contents of a 2-D image in a raw bitmap (raster) format is usually not economical and may result in very large files. Since raw image representations usually require a large amount of storage space (and proportionally long transmission times in the case of file uploads/ downloads), most image file formats employ some type of compression. The need to save storage space and shorten transmission time, as well as the human visual system tolerance to a modest amount of loss, have been the driving factors behind image compression techniques.Compression methods can be lossy, when a tolerable degree of deterioration in the visual quality of the resulting image is acceptable, or lossless, when the image is encoded in its ...