نتایج جستجو برای: compression algorithm

تعداد نتایج: 830477  

2006
William A. Stapleton Michael A. McNees

In this paper we present a case study of a three-component hybrid image compression algorithm combining the widely familiar, DCT-based JPEG algorithm with the Wavelet-based JPEG 2000 algorithm and a searchless fractal image compression algorithm capable of unusually deep quadtree spanning. Comparison of the relationship between compression rate and peak signal to noise ratio for each component ...

2009
Sana Ktata Kaïs Ouni Noureddine Ellouze

Abstract—Electrocardiogram (ECG) data compression algorithm is needed that will reduce the amount of data to be transmitted, stored and analyzed, but without losing the clinical information content. A wavelet ECG data codec based on the Set Partitioning In Hierarchical Trees (SPIHT) compression algorithm is proposed in this paper. The SPIHT algorithm has achieved notable success in still image ...

Journal: :CoRR 2016
Hamid Mansouri Hamid Reza Pourreza

With increasing usage of fingerprints as an important biometric data, the need to compress the large fingerprint databases has become essential. The most recommended compression algorithm, even by standards, is JPEG2000. But at high compression rates, this algorithm is ineffective. In this paper, a model is proposed which is based on parallel lines with same orientations, arbitrary widths and s...

2005
Sheng Bao

This article introduces a new DNA sequence compression algorithm which is based on look-up table and LZ77 algorithm. Combined a look-up-table-based pre-coding routine and LZ77 compression routine,this algorithm can approach a compression ratio of 1.9bits /base and even lower.The biggest advantage of this algorithm is fast, small memory occupation and it can easily be implementated.

2011
G Boopathi

In recent past, vector quantization has been observed as an efficient technique for image compression. In general, image compression reduces the number bits required to represent an image. The main significance of image compression is that the quality of the image is preserved. This in turn increases the storage space and thereby the volume of the data that can be stored. Image compression is t...

2009
Anthony Schmieder Howard Cheng Xiaobo Li

A hierarchical lossy image set compression algorithm (HMSTa) has recently been proposed for lossy compression of image sets. It was shown that this algorithm performs well when an image set contains well separated clusters of similar images. As a result, if one applies the HMSTa algorithm after a clustering algorithm has been applied, the compression performance depends on the quality of the pa...

2009
Gregory Leighton Denilson Barbosa

The eXtensible Markup Language (XML) provides a powerful and flexible means of encoding and exchanging data. As it turns out, its main advantage as an encoding format (namely, its requirement that all open and close markup tags are present and properly balanced) yield also one of its main disadvantages: verbosity. XML-conscious compression techniques seek to overcome this drawback. Many of thes...

Journal: :Computation 2017
Seyyed Mahdi Najmabadi Philipp Offenhäuser Moritz Hamann Guhathakurta Jajnabalkya Fabian Hempert Colin W. Glass Sven Simon

Computational fluid dynamic simulations involve large state data, leading to performance degradation due to data transfer times, while requiring large disk space. To alleviate the situation, an adaptive lossy compression algorithm has been developed, which is based on regions of interest. This algorithm uses prediction-based compression and exploits the temporal coherence between subsequent sim...

2012
I. Made Agus Dwi Suarjaya

People tend to store a lot of files inside theirs storage. When the storage nears it limit, they then try to reduce those files size to minimum by using data compression software. In this paper we propose a new algorithm for data compression, called jbit encoding (JBE). This algorithm will manipulates each bit of data inside file to minimize the size without losing any data after decoding which...

2000
Vadim Engelson Dag Fritzson Peter Fritzson

Applications in scientific computing operate with high-volume numerical data and the occupied space should be reduced. Traditional compression algorithms cannot provide sufficient compression ratio for such kind of data. We propose a lossless algorithm of delta-compression (a variant of predictive coding) that packs the higher-order differences between adjacent data elements. The algorithm take...

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