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检索条件"主题词=compression algorithms"

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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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A new lossy compression algorithm for ultrasound signals

A new lossy compression algorithm for ultrasound signals

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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 (...

引用

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

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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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A High compression Algorithm for Video Stream

A High Compression Algorithm for Video Stream

引用

Congress on Image and Signal Processing, CISP

作者： Wei-feng Liu Ji-li Lu Zeng-fu Wang Hua-jun Song Xue-zheng Han College of Information and Control Engineering China University of Petroleum Dongying China Zaozhuang University Zaozhuang China Department of Automation University of Science and Technology Hefei Anhui China

To reduce the temporal redundancy in video frame sequence for the similarity between the current and the prior image, a new video coding algorithm based on zero-tree wavelet with extremely high compression is presented in this paper. A new scheme is presented which employs adaptive strategy based on different motion detected in frame sequence. With the algorithm we have realized the real-time compression of video streams with high fidelity.

关键词： compression algorithms Video compression Streaming media Image coding Motion detection Signal processing algorithms Decoding Video sequences Wavelet transforms Arithmetic

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ECG compression using multilevel thresholding of wavelet coefficients

ECG compression using multilevel thresholding of wavelet coe...

引用

Intelligent Sensors, Sensor Networks and Information Processing Conference (ISSNIP)

作者： M. Sharafat Hossain Tareq Aziz M. A. Haque Department of EEE Dhaka University of Engineering and Technology Bangladesh Department of EEE American International University-Bangladesh Bangladesh Department of EEE Bangladesh University of Engineering and Technology Bangladesh

A wavelet-based electrocardiogram (ECG) compression algorithm is proposed in this paper. The proposed algorithm reduces the bit rate of ECG and preserves its main clinically diagnostic features intact by minimizing reconstructed signal distortion. The original signal is divided into blocks and each block goes through a discrete wavelet transform. A threshold based on energy packing efficiency of the wavelet coefficients is used to threshold the wavelet coefficients. To assess the proper applicability of the proposed technique we have evaluated the effect of threshold level selection on the quality of the reconstructed signal. To generalize the proposed method, the technique is tested for the compression of a large set of normal and abnormal ECG signals extracted from MIT-BIH database. The performance parameters of the compression algorithm are measured and an average compression ratio of 13.57 with percent root mean square difference (PRD) of 4.87 is achieved. This technique outperforms the recently published ones in most of the data sets of MIT-BIH database.

关键词： Electrocardiography Wavelet coefficients compression algorithms Discrete wavelet transforms Databases Bit rate Distortion Testing Data mining Root mean square

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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...

引用

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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An improved WSQ fingerprint image compression algorithm

An improved WSQ fingerprint image compression algorithm

引用

Asilomar Conference on Signals, Systems & Computers

作者： Jinshan Tang Xiaoming Liu College of Computer Science and Technology Wuhan University of Science and Technology Wuhan China Image Processing and Bio-Imaging Reasearch Laboratory Systems Research Institute Department of Advanced Technologies Alcorn State University Lorman MS USA

The wavelet/scalar quantization (WSQ) [1] fingerprint image compression algorithm is effective and has been widely applied to fingerprint image compression. However, WSQ cannot control the compression ratio and its performance on fuzzy images is poor. We propose an improved WSQ fingerprint image compression algorithm to overcome the above shortcomings. Our algorithm uses a mixed quantizer so that the algorithm can treat fuzzy and non-fuzzy fingerprint images separately. In order to control the compression ration, an optimization parameters for a specific compression ratio. The proposed algorithm is compared with the traditional WSQ fingerprint image compression algorithm and the results are encouraging.

关键词： Fingerprint recognition Image matching compression algorithms

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