For the purpose of encoding standard of color stop graphic, JPEG (ISO/ITU) selected an algorithm, based on ADCT(Adaptive Discrete Cosine Transformation) in ISO/ITU in 1988, and named this encoding mode as JPEG. Finally, JPEG(Joint Photographic Expert Group) algorithm was fixed as an international standard in 1992.

The basic concept of JPEG is based on the tool kit concept, so as to select the appropriate encoding mode for various application purposes, and apply them selectively. That is, as JPEG contains both lossless compression mode and lossy compression mode, and broadly incorporates the compression mode on the color stop graphic, it can be utilized by appropriate selection and combination of the compression modes or usable parameters, etc. according to its application field.

When using lossless compression mode, JPEG is able to compress about 1/2 of the information quantity, and when applying the base line mode, it can compress the information quantity to an average of 1/20, and a max. 1/50 without damaging the screen quality of the color graphic.

JPEG is a graphic image in which a user can select the range of pack quality(actually, just a part of a pack algorithm series) when made. JPEG file type is an official standard, designated as ISO 10918. JPEG is one of the graphic image file types along with GIF, which is supported by the web protocol, and generally, has a file name extension "jpg". JPEG supports a progressive JPEG, similar to the interlaced GIF. Examining from the algorithm side, JPEG can actually be accepted as the basis of all compression standard proposals. MPEG, a compression standardization of mobile video, also followed the basic concept of JPEG greatly

Thanks to the explosive increase of demand of camera phones, the demand of camera phone back-end chip using JPEG is increasing. Furthermore, the competition for realizing high quality stop image is becoming intense.