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检索条件"主题词=compression algorithms"

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A compression algorithm of hyperspectral remote sensing image based on 3-D Wavelet transform and fractal

A compression algorithm of hyperspectral remote sensing imag...

引用

International Conference on Intelligent System and Knowledge Engineering, ISKE

作者： Wei Pan Yi Zou Lu Ao Department of Cognitive Science Xiamen University Xiamen Fujian China Department of Automatization Xiamen University Xiamen Fujian China

In this paper, the 3-D wavelet-fractal coding was used to compress the hyperspectral remote sensing image. The classical eight kinds of affine transformations in 2-D fractal image compression were generalized to nineteen for the 3-D fractal image compression. Hyperspectral image date cube was first translated by 3-D wavelet and then the 3-D fractal compression coding was applied to lowest frequency subband. The remaining coefficients of higher frequency subbands were encoding by 3-D SPIHT. We use eight-fork tree division algorithm to improve the matching accuracy and reduce the time of fractal coding. The new compression method had been tested by MATLAB. The experiment results indicate that we can gain high compression ratios and the information loss is acceptable.

关键词： compression algorithms Hyperspectral sensors Hyperspectral imaging Remote sensing Wavelet transforms Fractals Image coding Frequency Testing MATLAB

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Aerial Remote Sensing Image compression Based on Modified CDF97 Lifting Scheme

Aerial Remote Sensing Image Compression Based on Modified CD...

引用

International Symposium on Intelligent Information Technology Application, IITA

作者： Xinxin Sui Qiming Qin Chuan Jin Yumei Sun Institute of Remote Sensing and GIS Peking University Beijing China

In this paper, lifting scheme is adopted for aerial image compression and modified CDF97 (MCDF97) wavelet is put forward as wavelet kernel. MCDF97 lifting algorithm improves defect that five lifting coefficients of CDF97 wavelet are all irrational numbers. The compression performance of MCDF97 wavelet is almost the same as that of the CDF97 wavelet, but the algorithm based on MCDF97 wavelet reduces operation memory, decreases complexity and accelerates the processing speed. After wavelet transform of aerial images, set partitioning in hierarchical trees (SPIHT) coding is adopted to quantize and code the wavelet coefficients. Experimental results indicate that this compression algorithm greatly improves compression efficiency of aerial images, and meets the requirement of aerial compression system for storage, operation time and hardware implement.

关键词： Remote sensing Image coding Image storage Kernel Partitioning algorithms Acceleration Wavelet transforms Wavelet coefficients compression algorithms Hardware

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IR database compression algorithm using optimized key mask

IR database compression algorithm using optimized key mask

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Gurpal Singh Sandeep Kalra B.S. Sohi Department of CSE and IT BBSBEC India Zilog Systems Bangalore India

The rapid growth of Universal Remote Controls, Interactive Remote Controls, electronics Products and Infra-red (IR) Database business has increased the need for effective and standardized IR Database compression techniques. In order to support a large number of Remote control models in a Universal remote, one must compress the available IR database as best as possible. This paper presents a new algorithm for representing optimized key-masks for model command sets. This technique changes the normal key mask into reduced key masks depending on the correlation between the Remote Control keys. In the normal key mask a unique flag represents each remote button/key. In this new technique, all the related buttons/keys can be combined together so that a single flag can represent these set of keys and thus leading to optimized and compressed IR database.

关键词： Databases compression algorithms Pulse width modulation Protocols Encoding Communication system control Frequency Space vector pulse width modulation Infrared spectra Signal generators

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compression independent object encryption for ensuring privacy in video surveillance

Compression independent object encryption for ensuring priva...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Paula Carrillo Hari Kalva Spyros Magliveras Department of Computer Science and Engineering Florida Atlantic University Boca Raton FL USA Department of Mathematical Sciences Florida Atlantic University Boca Raton FL USA

One of the main concerns of the wide use of video surveillance is the loss of individual privacy. Individuals who are not suspects need not be identified on camera recordings. Mechanisms that protect the identity while ensuring legitimate security needs are necessary. Selectively encrypting objects that reveal identity (e.g., faces or vehicle tags) is necessary to preserve individualspsila right to privacy. This paper presents a compression algorithm independent solution that provides privacy in video surveillance applications. The proposed approach is based on the use of permutation based encryption to hide identity revealing features. The permutation based encryption tolerates lossy compression and allows decryption at a later time. The use of permutation based encryption makes the proposed solution independent of the compression algorithms used. The paper presents the performance of the system when using H.264 video encoding.

关键词： Cryptography Bit rate Privacy Video surveillance Transform coding Surveillance compression algorithms

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An Experiment Study on Text Transformation for compression Using Stoplists and Frequent Words

An Experiment Study on Text Transformation for Compression U...

引用

International Conference on Information Technology: New Generations (ITNG)

作者： Jirapond Tadrat Veera Boonjing Software Systems Engineering LaboratoryDepartment of Mathematics and Computer Science Science King Mongkut's Institute of Technology Ladkrabang Thailand

The paper presents a new text transform algorithm suitable for embedding in compression algorithms. The strategy the new algorithm employed to increase performance of text compression is to replace words with predefined codes. Instead of using a huge dictionary containing exhaustive words as in previous works, the new algorithm uses a list of stoplists and/or frequent words. The research devised different encoding schemes for such a list. It then made experiments of using these schemes with different compression algorithms on standard texts. The result shows that each scheme gives increasing compression when using with specific compression algorithms.

关键词： Dictionaries Encoding compression algorithms Natural languages Information technology Software systems Systems engineering and theory Laboratories Mathematics Computer science

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Research the compression and Transmission Technology of Medical Image Base on the Remote Consultation

Research the Compression and Transmission Technology of Medi...

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International Conference on Bioinformatics and Biomedical Engineering (ICBBE)

作者： Yu-Zeng Wang Shi-Chao Geng Yu-Jun Fan Zhi-Quan Feng School of Mechanical Engineering University of JinanJinan China Jinan Danjier Electronic LtdJinan China School of Information University of JinanJinan China

The compression and transmission of medical image are the two key technology to realize the remote consultation system. It takes much energy in compression and transmission of medical image. Image collection, the ROI compression algorithm and JPEG2000, color image processing, and the network transmission technology based on TCP/IP are discussed in detail. It can realize the conversation function using HDP protocol. Using the technology of TCP/IP protocol and multi-thread it finished the image transmission function. It is difficult to make the image both seen by sender and receiver same in general transmission. So it takes all those technologies to send the whole image after compression the collection image, in order to avoid the different phenomenon. And it can transmit rapidly and steadily in some local region image. The remote consultation system called RDS2000 is developed successfully based those technologies. The system integrates the functions of video communication, character communication, image communication and remote control, and meanwhile it also verifies the validity and dependability of those technologies.

关键词： Image coding Biomedical imaging TCPIP Protocols Image communication compression algorithms Transform coding Color Image converters Video compression

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A new lossy compression algorithm for ultrasound signals

A new lossy compression algorithm for ultrasound signals

引用

IEEE Symposium (IUS) Ultrasonics

作者： Miguel de A. Freitas Marcelo R. Jimenez Henrique Benincaza Jean P. von der Weid Pontifícia Universidade Católica do Rio de Janeiro Rio de Janeiro RJ Brasil

A new lossy compression algorithm for RF ultrasound signals (A-scan) is presented, which stores only the largest variations of the original signal. The largest variation (LAVA) algorithm is a two-step, constant bit-rate (CBR) algorithm, using only simple addition/subtraction operations, which is very suitable for FPGA implementation. The algorithm is targeted for automated ultrasonic testing (AUT) systems where a significant data reduction has been obtained while preserving the important characteristics of the signal. Comparison to other existing compression techniques is provided using the PSNR metric.

关键词： compression algorithms Ultrasonic imaging RF signals Signal processing System testing Radio frequency Field programmable gate arrays Pipelines Real time systems Data processing

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Lossless Image compression Using Burrows Wheeler Transform (Methods and Techniques)

Lossless Image Compression Using Burrows Wheeler Transform (...

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International IEEE Conference on Signal-Image Technologies and Internet-Based System

作者： Elfitrin Syahrul Julien Dubois Vincent Vajnovszki Taoufik Saidani Mohamed Atri Laboratoire Electronique Informatique et Image Le2i Université de Bourgogne France Microélectronique Laboratory It06 Université de Monastir Laboratoire Electronique et Tunisia

The burrows-wheeler transform (BWT) is a combinatorial algorithm originally created for text compression such as bzip2, and that has been recently applied to image compression field. This paper focuses on the impact of compression scheme based on the combinatorial transform on high-level resolution medical images. It overviews the original scheme and some improvements that have been develop in post processing of BWT in this context. The performances of these techniques are compared and discussed. Moreover, considerations on the imagepsilas sizes and data formats are also considered.

关键词： Image coding Sorting compression algorithms Entropy coding Biomedical imaging Internet Image resolution Discrete cosine transforms Streaming media

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Lossless compression of Hyperspectral Image Based on Spatial-Spectral Hybrid Prediction

Lossless Compression of Hyperspectral Image Based on Spatial...

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9th International Conference on Signal Processing(第九届国际信号处理学术会议)(ICSP'08)

作者： Yong-hong Chen Long Ma Ze-lin Shi Shenyang Institute of Automation Chinese Academy of SciencesShenyang 110016P.R.China Graduate Scho Shenyang Institute of Automation Chinese Academy of SciencesShenyang 110016P.R.China

This paper proposes an improved lossless compression algorithm based on the spatial-spectral hybrid *** choose the prediction modes between the spatial and the spectral domains by computing the local correlation *** such coefficient is larger than the pre-designed threshold,the spectral linear predictor is adopted,which is able to capture more spectral correlation by re-estimating the ***,MED predictor is ***,prediction error images are coded by RICE *** are carried out on AVIRIS *** results show that the proposed method outperforms 3D-CALIC algorithm,MED and GAP spatial lossless prediction algorithms.

关键词： Image coding Hyperspectral imaging Hyperspectral sensors compression algorithms Prediction algorithms Remote sensing Entropy coding Hardware Spectroscopy Automation

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A 2-D ECG compression algorithm based on modified SPIHT

A 2-D ECG compression algorithm based on modified SPIHT

引用

IEEE/EMBS International Summer School on Medical Devices and Biosensors

作者： Zhelong Wang Pengfu Zhu Ying Chen School of Electronic and InformationEngineering Dalian University of Technology Dalian Liaoning China

A new two-dimensional (2-D) Electrocardiogram (ECG) signal compression algorithm named 2D Modified Set Partitioning In Hierarchical Trees (2-D MSPIHT), which is based on the SPIHT algorithm, has been proposed in this paper. According to the two correlativity of ECG signal, an ECG signal is cut and aligned to form a 2-D data array, and then 2-D MSPIHT can be applied. Simulation experiments by using the 2-D MSPIHT algorithm and SPIHT compression algorithms have been conducted to verify the validity of the 2-D MSPIHT algorithm and test its performance. The experimental results show that the proposed 2-D MSPIHT algorithm is valid and greater compression ratio can be achieved when the quality of the reconstructed signal is good.

关键词： Electrocardiography compression algorithms Wavelet transforms Two dimensional displays Parameter extraction Testing Frequency Data compression Neural networks Wavelet domain

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