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JPEG overview

The JPEG is an acronym for Joint Photographic Experts Group - committee ISO and ITU-T, which specified the standard of JPEG in 1992. The JPEG standard defines techniques of compressing, decompressing and storing image data. It is the most popular standard used in image compression. The committee defined set of coding processes called: Baseline, Extended DCT-based,  Looseless and Hierarchical. Excluding Looseless process, each of them looses some part of data during compression process. It means that decompressed image is not the same as orginal, but similar enough. The baseline process is the most popular coding scheme based on JPEG standard, used in the implementation of image processing. The figure below shows the baseline process scheme.