Incompressibility and Lossless Data Compression: An Approach by Pattern Discovery
Incompresibilidad y compresión de datos sin pérdidas: Un acercamiento con descubrimiento de patrones
Oscar Herrera Alcántara and Francisco Javier Zaragoza Martínez
Universidad Autónoma Metropolitana Unidad Azcapotzalco Departamento de Sistemas Av. San Pablo No. 180, Col. Reynosa Tamaulipas Del. Azcapotzalco, 02200, Mexico City, Mexico Tel. 53 18 95 32, Fax 53 94 45 34 oha@correo.azc.uam.mx , franz@correo.azc.uam.mx
]]> Article received on July 14, 2008
Abstract
We present a novel method for lossless data compression that aims to get a different performance to those proposed in the last decades to tackle the underlying volume of data of the Information and Multimedia Ages. These latter methods are called entropic or classic because they are based on the Classic Information Theory of Claude E. Shannon and include Huffman [8], Arithmetic [14], Lempel–Ziv [15], Burrows Wheeler (BWT) [4], Move To Front (MTF) [3] and Prediction by Partial Matching (PPM) [5] techniques. We review the Incompressibility Theorem and its relation with classic methods and our method based on discovering symbol patterns called metasymbols. Experimental results allow us to propose metasymbolic compression as a tool for multimedia compression, sequence analysis and unsupervised clustering.
Keywords: Incompressibility, Data Compression, Information Theory, Pattern Discovery, Clustering.
Resumen
Presentamos un método novedoso para compresión de datos sin pérdidas que tiene por objetivo principal lograr un desempeño distinto a los propuestos en las últimas décadas para tratar con los volúmenes de datos propios de la Era de la Información y la Era Multimedia. Esos métodos llamados entrópicos o clásicos están basados en la Teoría de la Información Clásica de Claude E. Shannon e incluye los métodos de codificación de Huffman [8], Aritmético [14], Lempel–Ziv [15], Burrows Wheeler (BWT) [4], Move To Front (MTF) [3] y Prediction by Partial Matching (PPM) [5]. Revisamos el Teorema de Incompresibilidad y su relación con los métodos clásicos y con nuestro compresor basado en el descubrimiento de patrones llamados metasímbolos. Los resultados experimentales nos permiten proponer la compresión metasimbólica como una herramienta de compresión de archivos multimedios, útil en el análisis y el agrupamiento no supervisado de secuencias.
Palabras clave: Incompresibilidad, Compresión de Datos, Teoría de la Información, Descubrimiento de Patrones, Agrupamiento.
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