Data compression standards

  • What is compression standards?

    Video compression standard is the key to compress a raw video, the encoding process mainly goes through four steps: prediction, transformation, quantization, and entropy coding, while decoding is a just reverted encoding process..

Compression ratios are around 50–60% of the original size, which is similar to those for generic lossless data compression. Lossless codecs use curve fitting or  LosslessLossyTheoryUses
Data compression algorithms encode all redundant information with the minimal number of bits required for reconstruction. Lossless compression will produce math- ematically exact copies of the original data. Lossy com- pression approximates the original data and retains essen- tial information.
Data compression algorithms reduce the size of the data stream by recognizing redundancy in their mathematical representation and then recoding the data for efficient storage and transmission. The compres- sion algorithms may also remove redundancy by first transforming the data or predicting the value of a data item.

Overview

In information theory, data compression, source coding

Lossless

Lossless data compression algorithms usually exploit statistical redundancy to represent data without losing any information

Lossy

In the late 1980s, digital images became more common, and standards for lossless image compression emerged. In the early 1990s

Theory

The theoretical basis for compression is provided by information theory and, more specifically

Uses

Entropy coding originated in the 1940s with the introduction of Shannon–Fano coding, the basis for Huffman coding which was developed in 1950

Is data compression reversible?

There are two fundamental classes of data compression technique: those that lose data and those that do not

Lossy data compression removes some actual data but leaves enough remaining data for the compressed format to be still usable; however, it is not reversible

A classic example is the reduction of the resolution of an image


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