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检索条件"任意字段=Conference on Image Compression and Encryption Technologies"

共 181 条记录，以下是21-30 订阅

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Fractal image coding based on same sized block mapping

Fractal image coding based on same sized block mapping

引用

conference on image compression and encryption technologies

作者： Zhao, Y Yuan, BZ No Jiaotong Univ Inst Informat Sci Beijing 100044 Peoples R China

ISBN: (纸本)0819442798

In traditional fractal image coding schemes, domain blocks are constrained to be twice as large as range blocks in order to ensure the convergence of the iterative decoding stage. However, this constraint has limited the fractal encoder to exploit the self-similarity of the original image. In order to overcome the shortcoming, a novel scheme using same sized range and domain blocks is proposed in the letter. Experimental results show the remarkable improvement in compression ratio and image quality.

关键词： fractal image coding image compression image coding

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An Adaptive JPEG compression-encryption System Using Optimized Local Quantization Matrices

An Adaptive JPEG Compression-Encryption System Using Optimiz...

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International conference on Electrical and Computing technologies and Applications (ICECTA)

作者： Youniss, Rimah Y. Bani Al-Zoubi, Moh'd Belal Awajan, Arafat PSUT Comp Engn Dept Amman Jordan PSUT Comp Graph Dept Amman Jordan PSUT Comp Sci Dept Amman Jordan

ISBN: (纸本)9781538608722

The JPEG compression techniques are known as a standardlossy compression techniques for images. In this paper, an adaptive approach is proposed where some changes in the quantization stage are made. The proposed approach mainly changes on the quantization matrix, according to the context of each image. Moreover, the adaptive approach has been developed to work as an encryption system that enables users to restore the original images after decompressing them. Compared to the standard JPEG quantization matrix, the proposed approach introduces an efficient compression system that decreases error rate in several tested scenarios, And efficient encryption system has been obtained as well.

关键词： JPEG Q-matrix DCT compression encryption

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New algorithm of classified vector quantization based on wavelet transform for image coding

New algorithm of classified vector quantization based on wav...

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conference on image compression and encryption technologies

作者： Xu, LP Kou, BL Zhao, YE Xidian Univ Sch Elect Engn Xian 710071 Peoples R China

ISBN: (纸本)0819442798

New algorithm of classified vector quantization based on wavelet transform for image coding is presented. According to the similarity in the same orientation but different levels of the discrete wavelet transform domain, this paper proposes a new algorithm of multiresolutional classified vector quantization. This algorithm exploits an efficient classifier to classify the vectors and uses the class information of the higher lever to instruct the vector classification of the lower lever by taking advantaging of the similarity. Simulation results show that this algorithm can get the higher image compression ratio and pleasant quality of the reconstructed image in comparison with others.

关键词： image compression wavelet transform classified vector quantization similarity

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Intra/inter-band coding in FCM-VQ of multispectral images

Intra/inter-band coding in FCM-VQ of multispectral images

引用

conference on image compression and encryption technologies

作者： Rangsanseri, Y Sangthongpraow, U Thitimajshima, P King Mongkuts Inst Technol Ladkrabang Fac Engn Dept Telecommun Engn Bangkok 10520 Thailand

ISBN: (纸本)0819442798

This paper presents a multispectral image compression method based on vector quantization technique that uses fuzzy c-means, (FCM) algorithm to generate the codebook. There are two ways to form the vector set from the input image: the intraband vector forming where each vector was formed by dividing the input image into blocks, and the interband vector forming where each vector was formed by the gray values of all bands representing a pixel. In this research, a modified version of FCM was used to reduce the execution time. The experimental results comparing the effect of both vector forming methods are given.

关键词： multispectral image compression vector quantization fuzzy c-means

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Hardware implementation of novel image compression-encryption system on a FPGA 9

Hardware implementation of novel image compression-encryptio...

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9th International conference on Electrical and Electronics Engineering, ELECO 2015

作者： Baǧbaba, Ahmet Çaǧri Örs, Berna Istanbul Technical University Turkey

ISBN: (纸本)9786050107371

With the development of digital technologies, compression and encryption have become important aspects of information. In many applications, encryption of compressed images is considered vital for hiding data. In this work, we implemented the image compression-encryption hardware on a FPGA. JPEG was used as a compression standard and Tiny encryption Algorithm was used as an encryption algorithm. Discrete Cosine Transform coefficients were encrypted by using two methods. First, only DC coefficients of each 8×8 block of image were encrypted. Then, along with DC coefficients, first five AC coefficients of each 8×8 block of image were encrypted. In the result, encrypted images and PSNR values were given in order to determine success of the work. This work is novel from the point of view encryption methods. © 2015 Chamber of Electrical Engineers of Turkey.

关键词： image compression

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A New image Crypto-compression System SPIHT-PSCS

A New Image Crypto-compression System SPIHT-PSCS

引用

2nd International conference on Control, Decision and Information technologies (CoDIT)

作者： Hadjem, Tarek Azzaz, Mohamed Salah Tanougast, Camel Sadoudi, Said Ecole Mil Polytech Lab Syst Commun Algiers Algeria Univ Lorraine LCOMS ASEC Team F-57070 Metz France

ISBN: (纸本)9781479967735

In this paper, a new algorithm combined compression and image encryption is presented. The proposed algorithm can be used in the field of high-speed confidential data transmission where security is required. The compression is based on a hierarchical structure called SPIHT(Set Partitioning in Hierarchical Trees). This compression is followed by an encryption scheme PSCS (Parametric Switching Chaotic System). The performances of this technique were evaluated in terms of compression quality and data security. Simulation results have shown the effectiveness of this technique, and thereafter, it is ready for a hardware implementation.

关键词： Chaos Logistic Map Tent Map SPIHT DWT EZW Haar PSCS

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ACE (Advanced compression encryption) Scheme for image Authentication

ACE (Advanced Compression Encryption) Scheme for Image Authe...

引用

International conference on Information and Communication Technology for Sustainable Development (ICT4SD)

作者： Sangwan, Bhavna Bhatia, Sakshi Technol Inst Text & Sci Dept Comp Engn Bhiwani India

ISBN: (纸本)9789811001291;9789811001277

In ancient times, there was a need to protect data. Due to the pervasive range in the field of security, several technologies came into existence. But the whole idea of securing data from attacks took a quick turn in the world of Internet. Here, data accuracy is the major issue. As in the previous existing methods, compression of data becomes an important research field that provides an efficient way for compressed data transmission over the Internet. The technique proposed here publicizes the concept of reliability and transmission mechanism. This is a faster and simple method of compression, and describes different lossless image compression algorithms for high performance. The newly adapted method produces better image quality without any loss of data. The suggested approach highlights security of data and provides a practical approach for compression of an image. The proposed ACE scheme works on binary concepts of compression of the image and encryption by reducing number of bits per pixel.

关键词： ACE scheme compression encryption image

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Privacy-preserving image Retrieval Scheme Allowing Mixed Use of Lossless and JPEG Compressed images 3

Privacy-preserving Image Retrieval Scheme Allowing Mixed Use...

引用

IEEE 3rd Global conference on Life Sciences and technologies (IEEE LifeTech)

作者： Iida, Kenta Kiya, Hitoshi Tokyo Metropolitan Univ Tokyo Japan

ISBN: (纸本)9781665418751

We propose a novel content based-image retrieval scheme for encryption-then-compression (EtC) images. In conventional retrieval schemes for EtC images, the JPEG standard was applied to EtC images as a compression method, although EtC images can be applied to both JPEG compression and lossless compression methods such as JPEG-LS. In contrast, the proposed retrieval scheme allows the mixed-use of lossless and lossy-compression methods. In an experiment, the proposed method is demonstrated to maintain a high retrieval performance, even under the mixed-use of lossless- and lossy-compressed EtC images.

关键词： encryption-then-compression system content-based image retrieval SIMPLE descriptor

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FPGA realisation of PSNR and BPP driven Adaptive compression and encryption Algorithm for RGB images 16

FPGA realisation of PSNR and BPP driven Adaptive Compression...

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7th International conference on Computing, Communication and Networking technologies (ICCCNT)

作者： Edavoor, Pranose J. Raveendran, Sithara Arjun, T., V Sumesh, K. P. Kumar, Nithin Y. B. Vasantha, M. H. Natl Inst Technol Ponda 403401 Goa India

ISBN: (纸本)9781450341790

The demand for a high performance image acquisition and processing technology is increasing due to wide usage of Multimedia Applications. The algorithm presented in this paper achieves high performance in terms of image compression by incorporating dynamically varying compression which is determined by the level of compression (bits per pixel(BPP)) and PSNR specified by the user. In order to make the algorithm more robust, an encryption module is also included which takes the encryption key as a user input to avoid hard coded key values. Pixel reshuffling is also included for improved data security. The proposed algorithm is implemented on hardware - Field Programmable Gate Array(FPGA) to test the effectiveness of the algorithm. The algorithm was simulated in Verilog on vivado 2014.3.1 and implemented on Kintex 7 FPGA which uses TSMC's 28 nanometer CMOS technology. In this paper the implementation of the algorithm for RGB images is discussed and the utilized programmable logic is also *** performance of the algorithm is validated with images and by evaluating threshold value for compression obtained for different value of BPP and PSNR.

关键词： FPGA Kintex 7 Dynamically varying threshold RGB image compression encryption

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An error-control based fractal coding algorithm

An error-control based fractal coding algorithm

引用

conference on image compression and encryption technologies

作者： Fu, P Wang, SG Yan, S Jilin Univ NanLing Reg Commun Dept Changchun 130025 Peoples R China

ISBN: (纸本)0819442798

In this paper, we propose a fractal image coding technique based on error-control method. By analyzing error gap between collage error and reconstruction error, we make correction to the selected domain blocks to reduce the collage error as well as the error gap. In this way, the reconstruction error is substantially reduced, and the collage theory is corrected. In simulation experimentation, we have got obvious incremental performance under condition of almost similar compression ratio with classical fractal image coding theory.

关键词： fractal image compression collage error reconstruction error vector quantization

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