A preliminary comparison between loss and lossless compression approaches for the remote sensing data processing was made. A three-stage lossless compression algorithm of multispectral remote sensing images based on wavelet transformations and intra-bands correlation is proposed and developed. It allows one to consider peculiarities of remote sensing data and to increase the compression ratio o...

The standard JPEG format is almost the optimum format in image compression. The compression ratio in JPEG sometimes reaches 30:1. The compression ratio of JPEG could be increased by embedding the Five Modulus Method (FMM) into the JPEG algorithm. The novel algorithm gives twice the time as the standard JPEG algorithm or more. The novel algorithm was called FJPEG (Five-JPEG). The quality of the ...

The YK algorithm [1] is a powerful lossless data compression algorithm built on a grammar-based framework, which optimally combines entropy coding and string matching capabilities to achieve excellent compression. Experimental results demonstrate that it outperforms most other known lossless codes on essentially all types and sizes of data. Our paper proposes the use of YK algorithm for data co...

Motivated by the possibility of storing a file in a compressed format, we formulate the following class of compression caching problems. We are given a cache with a specified capacity, a certain number of compression/uncompression algorithms, and a set of files, each of which can be cached as it is or by applying one of the compression algorithms. Each compressed format of a file is specified b...

Image compression is a key technology in transmission and storage of digital images because of vast data associated with them. This research suggests a new image compression scheme with pruning proposal based on discrete wavelet transformation (DWT). The effectiveness of the algorithm has been justified over some real images, and the performance of the algorithm has been compared with other com...

Rice algorithm, which has been recommended by Consultative Committee for Space Data System (CCSDS) for space telescope image lossless compression, is studied. Due to the similarity, this algorithm is applied on lossless compression of X-ray digital image after improvement and a satisfying compression rate is obtained. Firstly, the algorithm process is presented. Later on, the compression and de...

Introduction A new compression algorithm is presented which may either be considered an improvement to dictionary coding or an improvement to context coding. This algorithm works by reducing the set of available window position, for an LZ77 encoder to match from; thus fewer bits are required to indicate the match-from location, and higher compression is attained because the average match length...

In this paper, we present a new algorithm for text compression. The basic idea of our algorithm is to define a unique encryption or signature of each word in the dict.ionary by replacing certain characters in the words by a special character ‘*’ and retaining a few characters so that the word is still retrievable. For any encrypted text the most frequently used character is ‘*’ and the standard...