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检索条件"主题词=transform coding"

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A no-reference Blocking Artifacts Visibility Estimator in images

A no-reference Blocking Artifacts Visibility Estimator in im...

引用

IEEE International Conference on Image Processing

作者： Gilbert Yammine Eugen Wige André Kaup Multimedia Communications and Signal Processing University of Erlangen Nuremberg Erlangen Germany

In this paper, we present a new low-complexity no-reference metric that assesses the visibility of blocking artifacts in DCT-coded images. The metric works in the spatial domain as well as in the gradient image domain without remarkable changes. Our conducted simulations showed that the metric is highly robust among many image distortion databases and extremely consistent with subjective mean opinion scores (MOS). The metric also provides a blocking visibility map that can be used for adaptive filtering of blocking artifacts.

关键词： Measurement Databases Correlation Image coding transform coding Streaming media Mathematical model

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Efficient processing of JPEG2000 imagery

Efficient processing of JPEG2000 imagery

引用

International Symposium on Communications Control and Signal Processing (ISCCSP)

作者： Eric J. Balster William F. Turri Department of Electrical and Computer Engineering Kettering Laboratory University of Dayton Dayton OH USA University of Dayton Research Institute Dayton OH USA

Although optimal truncation of JPEG2000 compressed imagery provides an image of the highest quality per bitrate in terms of PSNR, the algorithm is highly computationally inefficient because of the removal of compressed image sections that have been previously calculated. The proposed idea utilizes a simple quantization technique prior to Tier I coding to remove many of the coding passes from the imagery that would not become a part of the final compressed bitstream. A new method based on the this idea is discussed. The method restricts the quantization value to be a power of 2, effectively eliminating the least significant bits of each codeblock through the quantization step, providing substantial reduction in computational complexity, a 39% reduction in overall complexity at 0.25 bits per pixel. The new method gives an equivalent rate distortion curve as traditional optimal truncation.

关键词： Image coding transform coding Quantization Encoding Computational complexity Bit rate Image quality Degradation Optimal control Signal processing algorithms

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Design method for scalable discrete trigonometric transforms (DTT) with constant geometry

Design method for scalable discrete trigonometric transforms...

引用

Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Nabil Kerkiz Adel Hussein Amr Elchouemi Adnan Suleiman David Akopian Intel Corporation Austin TX USA Electrical and Computer Engineering Department University of Texas San Antonio USA

In this paper we present a hardware architecture suitable for implementing discrete trigonometric transforms (DTT) including popular fast Discrete Cosine (DCT) and Sine (DST) transforms. The design method is modular and uses predesigned components to construct a transform system. A data shuffle network structure is presented in this work and we will show how it is used in conjunction with a partial column structure to build and compute the transforms. The scalability is based only on the transform size and the number of processing elements (PE). The transform throughput is determined by the number of PE and its associated shuffle network size. In this work we use a scalable DCT-II algorithm with a constant geometry structure to present the design methodology. The design approach can be applied to implement other discrete trigonometric transforms with similar property.

关键词： Design methodology Discrete transforms Geometry Signal processing algorithms Discrete cosine transforms Hardware Scalability Topology transform coding Algorithm design and analysis

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A bind RGB color image watermarking based on singular value decomposition

A bind RGB color image watermarking based on singular value ...

引用

ACS/IEEE International Conference on Computer Systems and Applications

作者： Nour El-Houda Goléa Rachid Seghir Redha Benzid University of Batna Algeria University of M'Sila Algeria

In this paper, we propose a novel SVD-based RGB color image watermarking, in which the watermark is assumed to be an RGB color image whose detection and extraction are performed in a blind manner. The performance of the proposed watermarking method is investigated by measuring its imperceptible and robust capabilities. For the imperceptible capability, a quantitative index, Peek Signal-to-Noise Ratio (PSNR), is employed to evaluate the difference between an original image and its corresponding watermarked image. For the robust capability, the Correlation Coefficient (CC) is also used to evaluate the similarity between the original watermark and the extracted one. Experimental results indicate that our technique is robust and produces high-quality watermarked images.

关键词： Watermarking Robustness Image color analysis Color Image coding transform coding Silicon

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Detecting Composite JPEG Images in transform Domain

Detecting Composite JPEG Images in Transform Domain

引用

International Conference on Multimedia Information Networking and Security (MINES)

作者： Ergong Zheng Xijian Ping Tao Zhang Zhengzhou Information Science and Technology Institute Zhengzhou China

Compositing is one of the most common forms of digital image tampering. In this paper, we present a passive approach to detect composite JPEG images by measuring inconsistencies of blocking artifacts. Firstly, double-compression detection is performed to estimate the primary quality factor. Secondly, the blocking artifacts ratio mapping is extracted in the DCT domain via computing the blocking artifacts with different block-dividing manners at primary quality factor. Finally, automatic tampering detection and location of tampered region are fulfilled by image segmentation. Experimental results indicate the proposed algorithm is effective to images of various qualities and small tampered regions. With the false positive rate of 1%, the detection accuracy for composite images is above 93% for differences of quality factors before/after tampering larger than 15 and for tampered regions with size 64×64. Furthermore, owing to the elimination of decompression/ compression conversion, the proposed method has advantage of low computational complexity.

关键词： transform coding Image coding Q factor Discrete cosine transforms Forgery Quantization Digital images

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A Novel Shot Detection Algorithm Based on RS in Compressed-Domain

A Novel Shot Detection Algorithm Based on RS in Compressed-D...

引用

Chinese Conference on Pattern Recognition (CCPR)

作者： Lichun Shi Jingzhi Cai Mingxin Zhang Jinlong Zheng College of Computer Science and Engineering Changshu Institute of Technology Changsha China College of Electronics and Information Engineering North Ethnic University Yinchuan China

We propose a novel shot detection algorithm based on RS in Compressed-Domain. Firstly, the Algorithm extracts I frames from Compressed-Domain data sequence. We constructs information system with the difference between two adjacent I frames in column and attributes sets witch extracted from decompressed I frames in row. Then the established information system is normalized and discredited. Secondly, we reduce information system by using attribute reduce theory of RS to obtain no redundant attributes, and detect shot by using the theory of classification of RS. Finally, the performance of the algorithm is K-mean cross validation. Experimental results show that the algorithm can reduce the computational complexity and improve the accuracy of the shot detection effectively.

关键词： Electronic mail transform coding Classification algorithms Streaming media Multimedia communication Data mining

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A Novel Image Retrieval Scheme Using DCT Filter-Bank of Weighted Color Components

A Novel Image Retrieval Scheme Using DCT Filter-Bank of Weig...

引用

International Conference on Information Science and Applications (ICISA)

作者： Yong-Ho Kim Seok-Han Lee Sangkeun Lee Tae-Eun Kim Jong-Soo Choi The Graduate School of Advanced Imaging Science Multimedia and Film Chung-Ang University Seoul South Korea Department of Multimedia Namseoul University Cheonan South Korea

ISBN: (纸本)9781424459421;9781424459438

In this paper, we present a novel approach for improving retrieval accuracy based on DCT (discrete cosine transform) Filter-bank. First, we perform DCT on a given image, and generate a Filter-bank using the DCT coefficients for each color channel. In this step, DC and the limited number of AC coefficients are used. Next, a feature vector is obtained from the histogram of the quantized DC coefficients. Then, AC coefficients in the Filter-bank are separated into three main groups indicating horizontal, vertical, and diagonal edge directions, respectively, according to their spatial-frequency properties. Each directional group creates its histogram after employing Otsu binarization technique. Finally, we project each histogram on the horizontal and vertical axes, and generate a feature vector for each group. The computed DC and AC feature vectors are concatenated, and it is used in the similarity checking procedure. In order to evaluate the proposed scheme, state-of-art approaches including DC-based and DC and AC energy-based retrieval systems are implemented and compared in terms of retrieval accuracy. Experimental results show that the proposed algorithm outperforms the other approaches.

关键词： Image retrieval Discrete cosine transforms Histograms Content based retrieval Image generation Concatenated codes transform coding Discrete transforms Information retrieval Testing

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Toward a multi-feature approach to Content-Based Copy Detection

Toward a multi-feature approach to Content-Based Copy Detect...

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IEEE International Conference on Image Processing

作者： Marzia Corvaglia Fabrizio Guerrini Riccardo Leonardi Pierangelo Migliorati Eliana Rossi DII-SCL University of Brescia Brescia Italy

Video Content-Based Copy Detection (CBCD) is an emergent research field which is targeted to the identification of modified copies of an original clip in a given dataset, e.g., on the Internet. As opposed to digital watermarking, the content itself is used to uniquely identify the video through the extraction of features that need to be robust against a certain set of predetermined video attacks. This paper advocates the use of multiple features together with detection performance estimation to construct a flexible video signature instead of a fixed, single feature based one. To combine diverse features, a normalized linear combination is also proposed. The system performance boost is evaluated through the MPEG Video Signature Core Experiment dataset and experimental results show how the proposed signature scheme can achieve impressive improvements with respect to the single feature approach.

关键词： Feature extraction Image color analysis transform coding Databases Vectors Layout Estimation

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H.264 Compressed Domain Watermarking in Content Delivery Network (CDN) Environment

H.264 Compressed Domain Watermarking in Content Delivery Net...

引用

International Conference on Computational Intelligence, Communication Systems and Networks, CICSYN

作者： T. Chattopadhyay Aniruddha Sinha Asmita Hardikar Innovation Lab Tata Consultancy Services Limited Kolkata India Tata Consultancy Services Limited India

Over the years it has been observed that a hacker, finds it less difficult to break any encryption key, even though it may require large number of attempts, specially with advent of high-speed machines. Therefore, an encryption method alone is not sufficient for copyright protection and ownership authentication of stored and streamed videos. Digital watermarking techniques have been proposed for this purpose. A fast method of watermarking of streamed H.264 video data is proposed in the present work to meet the real time criteria of a streaming CDN server. The approach involves a blind watermarking scheme that inserts watermark in transformed coefficients of Independent Decoder Refresh (IDR) frames of the streamed H.264. As these IDR frames are then required to reconstruct the P frames, the proposed scheme can ensure security for both type of frames namely I and P. The method also may include a hashing technique to hash the entire group of pictures (GOP) into a 128-bit number. This number, in turn, is used as watermark for the next GOP to ensure the integrity feature of the watermarking scheme.

关键词： Watermarking Videos Servers Streaming media Decoding transform coding Image coding

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Hardware Accelerator for Dictionary-Based Compression of MMP Algorithm

Hardware Accelerator for Dictionary-Based Compression of MMP...

引用

Computing Systems (WSCAD-SCC)

作者： Vanderson de L. Reis Edward David Moreno Murilo B. de Carvalho Instituto Federal do Amazonas (IFAM) FUCAPI Universidade Federal do Amazonas Brazil Universidade Federal de Sergipe Brazil Universidade Federal Fluminense Brazil

The MMP is an algorithm for image compression which uses the multiscale method of recurrent patterns, based on dictionary. The MMP has compression ratio at the same level of others compression algorithms which are based on transforms, having been detached to images with high frequency, however its execution time has been shown high, by repeated searches of these patterns in dictionaries. In this paper we propose a parallel and dedication hardware to accelerate the execution of MMP, and it is implemented in FPGA, which performs the critical function in 340ns, achieving a speedup of 300 over software version.

关键词： Image coding Hardware Software transform coding Pixel Wavelet transforms Field programmable gate arrays

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