Calgary Corpus

From Wikipedia, the free encyclopedia

The Calgary Corpus is a collection of text and binary data files, commonly used for comparing data compression algorithms. It was created by Ian Witten and Tim Bell in the 1980s and was commonly used in the 1990s. In 1997 it was replaced by the Canterbury Corpus, but the Calgary Corpus still exists for comparison and is still useful for its original intended purpose.

[edit] See also

• Comparison of file archivers

[edit] External links

• Original home of the Calgary Corpus
• New home
• Bell, Witten, and Cleary, 1988

v • d • e Data compression methods Lossless compression methods Theory Entropy · Complexity · Redundancy Entropy encoding Huffman · Adaptive Huffman · Arithmetic (Shannon-Fano · Range) · Golomb · Exp-Golomb · Universal (Elias · Fibonacci) · Asymmetric binary Dictionary RLE · LZ77/78 · LZW · LZWL · LZO · DEFLATE · LZMA · LZX · LZJB Others CTW · BWT · PPM · DMC Audio compression methods Theory Convolution · Sampling · Nyquist–Shannon theorem Audio codec parts LPC (LAR · LSP) · WLPC · CELP · ACELP · A-law · μ-law · MDCT · Fourier transform · Psychoacoustic model Others Dynamic range compression · Speech compression · Sub-band coding Image compression methods Terms Color space · Pixel · Chroma subsampling · Compression artifact Methods RLE · Fractal · Wavelet · SPIHT · DCT · KLT Others Bit rate · Test images · PSNR quality measure · Quantization Video compression Terms Video Characteristics · Frame · Frame types · Video quality Video codec parts Motion compensation · DCT · Quantization Others Video codecs · Rate distortion theory (CBR · ABR · VBR) Timeline of information theory, data compression, and error-correcting codes See Compression Formats and Standards for formats and Compression Software Implementations for codecs