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检索条件"主题词=transform coding"

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Image compression: Comparative analysis of basic algorithms

Image compression: Comparative analysis of basic algorithms

引用

East-West Design & Test Symposium (EWDTS)

作者： Yevgeniya Sulema Samira Ebrahimi Kahou Kyiv Polytechnic Institute National Technical University Ukraine Kyiv Polytechnic Institute National Technical University of Ukraine Iran

The basic algorithms for both lossless and lossy compression of images are discussed in the paper. The criteria of the contrastive analysis of compression algorithms are chosen. The classes of images are discussed. The results of algorithms realization and testing in MATLAB environment are shown in the diagrams and discussed. The recommendations on future improvement of image compression algorithms are formulated in this paper.

关键词： Image coding Algorithm design and analysis transform coding Fractals Classification algorithms Correlation Heuristic algorithms

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Look-up table based multiple watermarking with minimum distortion

Look-up table based multiple watermarking with minimum disto...

引用

International Conference on Computer and Communication Technology (ICCCT)

作者： Jaishree Jain Vijendra Rai Suneeta Agarwal Computer Science and Engineering Department Motilal Nehru National Institute of Technology Allahabad India USIT GGS Indraprastha university New Delhi India

Several quantization based watermarking techniques have been used for data hiding in which a watermark is embedded into the source image by quantizing the image coefficients and on the receiver end these coefficients are dequantized and watermarks are extracted from the watermarked image. In all these techniques after embedding the watermark some perceptual degradation is observed in the visual quality of the image. In quantization based embedding method all of the quantized values are equally separated in the range of the possible values and are alternately assigned to messages "1" and "0." The probabilities of watermark errors caused by malicious tampering and incidental distortion will be, respectively, maximized in this scheme. To enhance the security a lookup table (LUT) is generated first for embedding the binary watermark in which the quantization intervals are randomly assigned to "1" and "0" and then its robustness is analyzed. From the experimental results it is analyzed that LUT based embedding proves to be highly robust in comparison to other quantization based embedding method.

关键词： Watermarking Table lookup Quantization Robustness Image coding transform coding Pixel

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A Robust Evolutionary Based Digital Image Watermarking Technique in DCT Domain

A Robust Evolutionary Based Digital Image Watermarking Techn...

引用

International Conference on Computer Graphics, Imaging and Visualization, CGIV

作者： Majid Rafigh Mohsen Ebrahimi Moghaddam Electrical and Computer Engineering Department Shahid Beheshti University Tehran Iran

Digital watermarking techniques are used for the digital right managements and copyright protection. As known, it is a big deal in watermarking systems to make a good trade of between the robustness and imperceptibility. This paper presents a watermarking algorithm in the DCT domain using an evolutionary algorithm to satisfy both of robustness and imperceptibility. We employ a genetic-based algorithm to select pairs in DCT coefficients and insert watermark bit according to mathematical relation between selected coefficients in each 8×8 DCT block of image. The proposed method has been implemented and tested under various attacks including JPEG compression, additive noise distortion, and image filtering. The achieved results show that image remains imperceptible while the watermark survives the attacks especially in case of JPEG compression.

关键词： Watermarking Discrete cosine transforms Robustness PSNR Equations transform coding Biological cells

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A novel 3D wavelet-based method for blind digital video watermarking

A novel 3D wavelet-based method for blind digital video wate...

引用

IEEE Symposium on Industrial Electronics & Applications (ISIEA)

作者： Amir Zamanidoost Sattar Mirzakuchaki Reza Ebrahimi Atani Zhinoos Razavi Hesabi Mehdi Ayat Department of Electrical Engineering Iran University of Science and Technology Tehran Iran Department of Electrical Engineering University of Aveiro Aveiro Portugal Electrical and Computer Engineering Iran University of Science and Technology Tehran Iran

In this paper, a blind video watermarking algorithm based on 3D wavelet transform and Human Visual System (HVS) model is proposed. The proposed method is based on extracting temporal characteristics of video signal and using it to adjust spatial features of each frame. These frames are designed based on HVS model embed the message. Then the message will be extracted from video watermarked through blind way. Experimental results verifies the robustness of this method against frame swapping, frame dropping, frame averaging and MJPEG and MPEG2 compression.

关键词： Watermarking Robustness transform coding Pixel Image coding transforms Electrical engineering

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A reduced-reference metric based on the interest points in color images

A reduced-reference metric based on the interest points in c...

引用

Picture coding Symposium, PCS

作者： M. Nauge M.-C. Larabi C. Fernandez XLIM-SIC Laboratory University of Poitiers France

In the last decade, an important research effort has been dedicated to quality assessment from subjective and objective points of view. The focus was mainly on Full Reference (FR) metrics because of the ability to compare to an original. Only few works were oriented to Reduced Reference (RR) or No Reference (NR) metrics, very useful for applications where the original image is not available such as transmission or monitoring. In this work, we propose a RR metric based on two concepts, the interest points of the image and the objects saliency on color images. This metric needs a very low amount of data (lower than 8 bytes) to be able to compute the quality scores. The results show a high correlation between the metric scores and the human judgement and a better quality range than well-known metrics like PSNR or SSIM. Finally, interest points have shown that they can predict the quality of compressed color images.

关键词： Measurement transform coding Image coding Humans Image quality Detectors Correlation

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On the design of low-power cache memories for homogeneous multi-core processors

On the design of low-power cache memories for homogeneous mu...

引用

International Conference on Microelectronics, ICM

作者： Abu Asaduzzaman Manira Rani Fadi N. Sibai Department of Electrical Eng and Computer Science Wichita State University Wichita Kansas USA Dept of Computer & Electrical Eng and Computer Science Florida Atlantic University Boca Raton Florida USA Computer Systems Design UAE University Al Ain United Arab Emirates

We investigate the impact of level-1 cache (CL1) parameters, level-2 cache (CL2) parameters, and cache organizations on the power consumption and performance of multi-core systems. We simulate two 4-core architectures - both with private CL1s, but one with shared CL2 and the other one with private CL2s. Simulation results with MPEG4, H.264, matrix inversion, and DFT workloads show that reductions in total power consumption and mean delay per task of up to 42% and 48%, respectively, are possible with optimized CL1s and CL2s. Total power consumption and the mean delay per task depend significantly on the applications including the code size and locality.

关键词： Delay Power demand Discrete Fourier transforms Organizations transform coding Multicore processing

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Seafloor image compression with large tilesize vector quantization

Seafloor image compression with large tilesize vector quanti...

引用

Symposium on Autonomous Underwater Vehicle Technology (AUV)

作者： Chris Murphy Robert Y. Wang Hanumant Singh Deep Submergence Laboratory Woods Hole Oceanographic Institution Woods Hole MA USA CSAIL Massachusetts Institute of Technology Cambridge MA USA

Autonomous Underwater Vehicles (AUVs) often communicate with scientists on the surface over an unreliable acoustic channel. The challenges of operating in deep waters, over long distances, and with surface ship noise amount to a communication channel with a very low effective bandwidth. This restriction makes transmission of images, even highly compressed images, quite difficult. We present an image compression algorithm designed to convey the gist of an image to surface operators in a very small number of bytes. Our technique divides a large existing database of underwater images into `tiles', and uses these to reconstruct an approximation to new underwater images from a similar domain. We achieve significantly higher compression ratios than conventional image compression techniques, such as JPEG or SPIHT, while still being able to provide useful visual feedback to the surface.

关键词： Tiles Image coding Acoustics Principal component analysis Pixel transform coding Sea surface

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A MPEG-2/MPEG-4 Quantizer to Improve the Video Quality in IPTV Services

A MPEG-2/MPEG-4 Quantizer to Improve the Video Quality in IP...

引用

International Conference on Networking and Services (ICNS)

作者： Marcelo Atenas Miguel Garcia Alejandro Canovas Jaime Lloret Instituto de Investigación para la Gestión Integrada de Zonas Costeras Universidad Politécnica de Valencia Valencia Spain

ISBN: (纸本)9781424459278;9780769539690

The main issue in Digital Terrestrial Television and in IPTV networks is the Quality of Experience received by the end users. For this reason, there are needed mechanisms to automatically measure the video quality of the images received. In this paper we analyze video quantization in order to determinate an optimal quantizer_scale factor value for its transmission. Then, it is used as an automatic measure to improve the video quality received by the end user. The paper shows the measurements taken for Video Quality, for Video Quality Metric and the bandwidth consumed for several types of video quality. Finally, we show the visual comparison between a high quantizer_scale factor and a reference video. Our work shows that an optimal quantizer_scale factor can be used to save bandwidth in an IPTV network or to improve the Video Quality for the same bandwidth consumption.

关键词： MPEG 4 Standard IPTV Digital video broadcasting transform coding Bandwidth Streaming media Video compression Quantization Digital TV Digital modulation

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A Contour-Based Semi-fragile Image Watermarking Algorithm in DWT Domain

A Contour-Based Semi-fragile Image Watermarking Algorithm in...

引用

International Workshop on Education Technology and Computer Science, ETCS

作者： Daxing Zhang Zhigeng Pan Haihua Li State Key Laboratory of CAD & CG University of Zhejiang Hangzhou China Institute of Graphics and Image Hangzhou Dianzi University Hangzhou China

ISBN: (纸本)9781424463886;9780769539874

To authenticate image content tolerant to lossy compression, a semi-fragile image watermarking algorithm based on contour is proposed in this paper. The Y subdivision of original image is subdivided to 4×4 blocks and executed 2-level DWT transform first, then filtered contour image derived from Canny edge detector is used as image feature to generate a watermark. Arnold transform is performed on watermark image to destroy space relativity. Watermark embedding is realized through changing the relationship of selected middle DWT coefficients according corresponding watermark bit. The subtraction result of calculated contour image and extracted watermark image is used to authenticate the content of the image. There is no perceptible degradation to original image. Experiments show that the scheme is useful to meet the requirements of image content authentication and no acceptable JPEG compression is rejected.

关键词： Watermarking Discrete wavelet transforms Authentication Protection Image coding Image edge detection transform coding Robustness Degradation Image processing

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An Ensemble of Classifiers Approach to Steganalysis

An Ensemble of Classifiers Approach to Steganalysis

引用

International Conference on Pattern Recognition

作者： Sevinc Bayram Ahmet Emir Dirik Husrev Taha Sencar Nasir Memon ECE Department NYU Poly USA CE Department TOBB ETU Turkey CSE Department NYU Poly USA

Most work on steganalysis, except a few exceptions, have primarily focused on providing features with high discrimination power without giving due consideration to issues concerning practical deployment of steganalysis methods. In this work, we focus on machine learning aspect of steganalyzer design and utilize a hierarchical ensemble of classifiers based approach to tackle two main issues. Firstly, proposed approach provides a workable and systematic procedure to incorporate several steganalyzers together in a composite steganalyzer to improve detection performance in a scalable and cost-effective manner. Secondly, since the approach can be readily extended to multi-class classification it can also be used to infer the steganographic technique deployed in generation of a stego-object. We provide results to demonstrate the potential of the proposed approach.

关键词： Training data Accuracy transform coding Security Markov processes Feature extraction Discrete cosine transforms

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