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Image Quality Assessment for JPEG and JPEG2000

Image Quality Assessment for JPEG and JPEG2000

引用

International Conference on Convergence Information Technology

作者： Ratchakit Sakuldee Nuntapong Yamsang Somkait Udomhunsakul Faculty of Engineering Department of Information Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand

Assessment of the compressed image quality is an important issue for image processing system. In this paper, we propose a novel objective assessment to measure the quality of gray scale compressed image, which is developed from the fundamental objective measurement. It is also correlated well with human response and least time taken comparable to some existing measurements. The proposed measurement, spatial frequency measurement (SFM) is adopted to enhance the image quality evaluation performance. From the experimental results, we found that mean average error (MAE) with SFM (MAESFM) is the suitable measurements that can be used to measure the quality of JPEG and JPEG2000 compressed images. In addition, MAESFM measurement is scaled to make them equivalent to MOS, given the rate of compressed image quality from 1 to 5 (unacceptable to excellent quality).

关键词： Image quality Image coding transform coding Frequency measurement Distortion measurement Image processing PSNR Information technology Humans Time factors

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Copy-move forgery detection in images via 2D-Fourier transform

Copy-move forgery detection in images via 2D-Fourier Transfo...

引用

International Conference on Telecommunications and Signal Processing (TSP)

作者： Seniha Ketenci Guzin Ulutas Electrical and Electronics Engineering Department Karadeniz Technical University Trabzon Turkey Computer Engineering Department Karadeniz Technical University Trabzon Turkey

Digital images have been widely used in many applications. However, digital image forgery has already become a serious problem due to the rapid development of powerful image editing software. One of the most commonly used forgery techniques is Copy-move forgery that copies a region of an image and pastes it on the other region in the same image. In recent years, most techniques aim to detect such tampering. Different feature extraction methods have been used to improve the capability of the detection algorithm. In this work, we used two dimensional Fourier transform (2D-FT) to extract some features from the blocks. Predetermined number of Fourier coefficients hold information about the blocks. At the final stage, the similarity search between the adjacent feature vectors is performed to determine the forgery. Experimental results show that proposed method can detect the duplicated regions with high accuracy rate even if the image is distorted with blurring mask or it is compressed with different JPEG quality factors. The dimension of feature vector is also lower than the other methods in the literature. Thus, the method ensures the lower feature vector with high accuracy rates. The proposed method also detects multiple copy move forgery as shown in the results.

关键词： Forgery Vectors Feature extraction Accuracy Digital images Detection algorithms transform coding

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Robust algorithm for scene analysis on compressed video

Robust algorithm for scene analysis on compressed video

引用

IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： Minsup Lee Byoungchul Ahn Inkyu Kim Department of Computer Engineering Yeungnam University South Korea School of Management Information Systems Kookmin University South Korea

ISBN: (纸本)0780355830

This paper presents a robust method to detect scene changes from compressed video streams. Scene changes are detected with DC components of DCT coefficients in MPEG encoded video sequences. Instead of decoding full frames, partial macroblocks of each frame, horizontal and vertical macroblocks, are decoded to perform scene changes. This method detects abrupt and gradual scene changes by decoding minimal blocks and saves a lot of computations. The experiment results show at least 95% detection performance for dramas, news and animations.

关键词： Robustness Image analysis Video compression Layout Decoding Streaming media Discrete cosine transforms transform coding Video sequences Animation

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MPEG-2 video decompression on a multiprocessing VLIW microprocessor

MPEG-2 video decompression on a multiprocessing VLIW micropr...

引用

IEEE International Conference on Consumer Electronics (ICCE)

作者： P. Sriram S. Sudharsanan A. Gulati Sun Microsystems Inc. Palo Alto CA USA

The compression and decompression of MPEG-2 video play a major role in entertainment delivery devices. This paper investigates software MPEG-2 video decoding on a multiprocessing microprocessor, MAJC-5200. MAJC (microprocessor architecture for Java computing), is a very long instruction word (VLIW) processor with an instruction set geared towards multimedia computing. We describe the microprocessor and show that less than 50% of a single CPU out of the available true processors is sufficient for decoding 4 Mb/s video sequences.

关键词： VLIW Microprocessors transform coding Video compression Decoding Computer architecture Java Computer aided instruction Multimedia computing Video sequences

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Avoiding oddification to simplify MPEG-1 decoding with LNS

Avoiding oddification to simplify MPEG-1 decoding with LNS

引用

IEEE Workshop on Multimedia Signal Processing

作者： M.G. Arnold Lehigh University Bethlehem PA USA

Low-precision logarithmic number system (LNS) arithmetic can reduce the power consumption for MPEG decoding compared to conventional fixed-point techniques. Although this introduces small numeric errors, which violate the IEEE-1180 standard for the inverse discrete cosine transform (IDCT), the visual effects of such error may be tolerable for portable battery-powered devices, like videophones, that have limited-resolution displays. The MPEG standard achieves video compression by quantization of the data fed to the IDCT. The MPEG decoder must multiply this data by dequantization factors. Such multiplication, by itself, is trivial with LNS since adding logarithms is equivalent to multiplication. The IEEE-1180 standard suggests oddification, where fixed-point data is forced to become odd after dequantization to minimize IDCT mismatch between the encoder and the decoder. Oddification poses an implementation problem for data in LNS format. This paper suggests that the visual effect of LNS without oddification is nearly indistinguishable from LNS with oddification, meaning that the benefits of LNS in MPEG are even greater than previously expected.

关键词： Decoding transform coding Visual effects Fixed-point arithmetic Energy consumption Discrete cosine transforms Displays MPEG standards Video compression Quantization

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Implementation of MPEG4 Decoding on FPGA

Implementation of MPEG4 Decoding on FPGA

引用

International Conference on Microelectronics, ICM

作者： N. Masood S.S. Naqvi Department of Computer Engineering University of Engineering and Technology Taxila Pakistan

MPEG-4 supports coding of video objects with spatial and temporal scalability. Scalability allows decoding a part of a stream and construct images with reduced decoder complexity (reduced quality)

关键词： MPEG 4 Standard Decoding Field programmable gate arrays Discrete cosine transforms transform coding Quantization Motion estimation Video compression Motion compensation Pixel

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Approximation of DCT without multiplication in JPEG

Approximation of DCT without multiplication in JPEG

引用

IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： G. Rozinaj A. Marcek Slovak Technical University Bratislava Slovakia

An original algorithm for the approximation of the discrete cosine transform (DCT) without multiplication is presented. The method is based on a recursive generator of discrete harmonic signals. The "speed/accuracy" ratio can be tuned due to input specifications. The actual accuracy and error analysis depend on the length of the DCT. We analyse the possibility of using our algorithm in JPEG image compression. However, application of the approximation method is possible in all problems using DCT. Our new approach to the DCT approximation is applicable to other transforms such as the DFT.

关键词： Discrete cosine transforms Image coding Signal processing algorithms transform coding Signal generators Digital signal processing Frequency Approximation algorithms Algorithm design and analysis Discrete transforms

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Envisage and authoring a video with sketch and text gloss SSG

Envisage and authoring a video with sketch and text gloss SS...

引用

International Conference on Information Communication and Embedded Systems (ICICES)

作者： S. Selvi K. Satheesh Department of computer science and engineering K.S.R College of Engineering Tiruchengode

Interface intend issues relevant to this project which embrace the assimilation of media, annotation, use of descriptions, standards, accomplish the purpose of the multimedia system. Envisage a video in multimedia milieu with authoring is, serene a prickly way. In this dissertation we present a twofold of action, at initial arena annotate a video with text depiction and sketch generation using Sobel Edge Detection Algorithm. This approach is used to engender sketches using sobel operator which discover the spiky intensity variation of an image and it attain the edges of the objects enclosed on the image and then we found similiarity between sketch and original image. At the instant phase we recommend a scene structured graph to authorize a video.

关键词： Image edge detection Multimedia communication Visualization Streaming media transform coding Semantics Media

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A Novel Shift Block for Reducing Quantization Effects within Four Adjacent DCT Domains

A Novel Shift Block for Reducing Quantization Effects within...

引用

Congress on Image and Signal Processing, CISP

作者： Yen-Yu Chen Ying-Wen Chang Department of Information Management Chung-Chou Institute of Technology Taiwan

Blocking effect is the major drawback in DCT-based (discrete cosine transformation) codecs at low bit-rates. In this paper, a post-processing filter is proposed in DCT frequency domain. The proposed algorithm uses a shift block within four adjacent DCT blocks to reduce computational complexity. By slightly modifying several DCT coefficients in the shift block, the artifacts that result from quantization and dequantization process are alleviated. The simulation results show that both visual perception and objective image quality are improved noticeably.

关键词： Quantization Discrete cosine transforms Filters Image edge detection Frequency Signal processing algorithms Image quality Image coding transform coding Signal processing

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A digital watermarking method based on classified labeled-bisecting-k-means clustering

A digital watermarking method based on classified labeled-bi...

引用

International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Wen Xing Zhe-Ming Lu Hao-Xian Wang Department of Automatic Test and Control Harbin Institute of Technology Harbin China

ISBN: (纸本)0780378652

With the growing interest in copyright protection of multimedia, digital watermarking has been presented and widely researched. The digital image watermarking techniques are usually performed in spatial or transform domain. Most of transform-domain watermarking methods are based on Discrete Cosine transforms (DCT) and robust to JPEG lossy compression. Recently, digital image watermarking based on another significant lossy compression technique, Vector Quantization (VQ), has appeared, which carries watermark information by codeword indices. It is quite effective, especially for the robustness to VQ compression with the same codebook. We develop a more favorable image watermarking method based on classified VQ in this paper. This technique can achieve excellent embedding performance and extract the watermark without the original image. This original theoretical result is acceptable with experiments that show superiority to some existing VQ-based watermarking algorithms, and the watermarked image is robust to some common signal processing operations.

关键词： Watermarking Robustness Image coding Digital images Discrete cosine transforms Signal processing algorithms Copyright protection Discrete transforms transform coding Vector quantization

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