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U. Glaeser

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Evolution of Standard Image/Video Compression Algorithms<br />

The expanding interest in mobile multimedia communications and the concurrently expanding growth<br />

of data traffic requirements have led to a tremendous amount of research work during a period of over<br />

15 years for developing efficient image and video compression algorithms. Both International Telecommunications<br />

Union (ITU) and International Organization for Standardization (ISO) have released a<br />

number of standards for still image and video coding algorithms that employ the discrete cosine transforms<br />

(DCT) and the Macroblock (MB) structure of an image to suppress the temporal and spatial redundancies<br />

incorporated in a sequence of images. These standardized algorithms aimed at establishing an<br />

optimal trade-off between the coding efficiency and the perceptual quality of the reconstructed signal.<br />

After the release of the first still-image coding standard, namely JPEG [1], CCITT recommended the<br />

standardisation of the first video compression algorithm for low-bit rate communications at p × 64 kbit/s<br />

over ISDN, namely ITU-T H.261 [2] in 1990. In post 1990s, intensive work has been carried out to<br />

develop improved versions of the aforementioned ITU standard, and this has culminated in a number<br />

of video coding standards, namely MPEG-1 [3] for audiovisual data storage (1.5-2 Mbit/s) on CD-ROM,<br />

MPEG-2 [4] (or ITU-T H.262) for HDTV applications (4–9 Mbit/s), ITU-T H.263 [5] for very low bit<br />

rate (

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