Standards define a common language that different parties can use, so that they can communicate with one another. Standards are thus, a prerequisite to effective communication. Video coding standards define the bitstream syntax, the language that the encoder and the decoder use to communicate. Besides defining the bitstream syntax, video coding standards are also required to be efficient, in th...

This report presents the results of applying different compression algorithms to the network protocol of an online game. The algorithm implementations compared are zlib, liblzma and my own implementation based on LZ77 and a variation of adaptive Huffman coding. The comparison data was collected from the game TomeNET. The results show that adaptive coding is especially useful for compressing lar...

Most digital cameras acquire data through a Bayer Colour Filter Array (CFA) placed on sensors where each pixel element records intensity information of only one colour component. The colour image is then produced through a pipeline of image processing algorithms which restores the subsampled components. In the last few years the wide diffusion of Digital Still Cameras (DSC) and mobile imaging d...

—In this paper, a new image compression technique that uses three-dimensional Discrete Cosine Transform and relies on Two-Dimensional Discrete Wavelet Transform, for image classification, is proposed. The proposed technique utilizes a modified quantization table and a method for converting a three-dimensional image cube into a onedimensional array, which provides better coding efficiency in th...

Compression methods are widely used for reducing storage and enhanc-ing transfer of digital images. By selectively discarding visually subtle detailsfrom images, it is possible to represent images with only a fraction of the bitsrequired for the uncompressed images. The best lossy image compression meth-ods currently used are based on quantization, modeling and entropy coding of...

Problem statement: Efficient color image compression algorithm is essential for mass storage and the transmission of the image. The compression efficiency of the Set Partitioning in Hierarchical Tree (SPIHT) coding algorithm for color images is improved by using correlation theory. Approach: In this study the correlation between the color channels are used to propose the new algorithm. The corr...

Data-intensive query processing tasks like data mining, scientific data analysis, and decision support can leave a database system severely I/O-bound, even when common RAID configurations are used. Traditionally, this problem has been tackled by adding more and more disks, connected through expensive interconnect networks. This brute-force approach results in systems of which the price is domin...

adapted from Noll (2000) Audio compression or audio coding algorithms are used to obtain compact digital representations of high-fidelity (wideband) audio signals for the purpose of efficient transmission or storage. The central objective in audio coding is to represent the signal with a minimum number of bits while achieving transparent signal reproduction, i.e., generating output audio that c...

This paper addresses the problem of speeding up string matching by text compression, and presents a compressed pattern matching (CPM) algorithm which finds a pattern within a text given as a collage system 〈D,S〉 such that variable sequence S is encoded by byte-oriented Huffman coding. The compression ratio is high compared with existing CPM algorithms addressing the problem, and the search time...