video compression - ορισμός. Τι είναι το video compression
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Τι (ποιος) είναι video compression - ορισμός

PROCESS OF ENCODING INFORMATION USING FEWER BITS THAN THE ORIGINAL REPRESENTATION
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  • Comparison of [[spectrogram]]s of audio in an uncompressed format and several lossy formats. The lossy spectrograms show [[bandlimiting]] of higher frequencies, a common technique associated with lossy audio compression.
  • Processing stages of a typical video encoder
  • [[MP3]], an example of a lossy file format compared to [[WAV]].
  • Solidyne 922: The world's first commercial audio bit compression [[sound card]] for PC, 1990

video compression         
Compression of sequences of images. Video compression algorithms use the fact that there are usually only small changes from one "frame" to the next so they only need to encode the starting frame and a sequence of differences between frames. This is known as "inter-frame coding" or "3D coding". MPEG is a committee producing standards in this area and also the name of their standard algorithm. H.261 is another standard. See also Integrated Information Technology, 3DO, full-motion video, Online Media.
compressed video         
data compression         
<algorithm> compression. Probably to distinguish it from (electronic) signal compression. (1995-04-02)

Βικιπαίδεια

Data compression

In information theory, data compression, source coding, or bit-rate reduction is the process of encoding information using fewer bits than the original representation. Any particular compression is either lossy or lossless. Lossless compression reduces bits by identifying and eliminating statistical redundancy. No information is lost in lossless compression. Lossy compression reduces bits by removing unnecessary or less important information. Typically, a device that performs data compression is referred to as an encoder, and one that performs the reversal of the process (decompression) as a decoder.

The process of reducing the size of a data file is often referred to as data compression. In the context of data transmission, it is called source coding; encoding done at the source of the data before it is stored or transmitted. Source coding should not be confused with channel coding, for error detection and correction or line coding, the means for mapping data onto a signal.

Compression is useful because it reduces the resources required to store and transmit data. Computational resources are consumed in the compression and decompression processes. Data compression is subject to a space–time complexity trade-off. For instance, a compression scheme for video may require expensive hardware for the video to be decompressed fast enough to be viewed as it is being decompressed, and the option to decompress the video in full before watching it may be inconvenient or require additional storage. The design of data compression schemes involves trade-offs among various factors, including the degree of compression, the amount of distortion introduced (when using lossy data compression), and the computational resources required to compress and decompress the data.

Παραδείγματα από το σώμα κειμένου για video compression
1. "Greater bandwidth, better video compression, better video editing tools –– all hit the maturity point when you had a vehicle as well as the tools," he said.
2. By Nir Zalik Optibase, a Herzliya company that develops Internet video compression solutions, is laying off 15 of its workers, about 10% of the company‘s work force.
3. Apple (www.apple.com), for instance, added a better noise–canceling microphone to its iSight camera, priced at $14'.''. The newest version of the Macintosh operating system also includes a more sophisticated video compression algorithm called H.264.