The original idea of the paper is to exploit depth maps in order to increase compression efficiency for multiview video. Depth information is used to establish a 3D mapping between each pixel in an encoded frame and i...
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The original idea of the paper is to exploit depth maps in order to increase compression efficiency for multiview video. Depth information is used to establish a 3D mapping between each pixel in an encoded frame and its counterpart in the reference view. With this mapping motion vectors and reference frame indices can be obtained independently for each pixel in a coded picture by a simple derivation of the motion information assigned to the corresponding pixel in the reference view. The goal of the paper is to explore a practical way to use this idea in multiview video coding. This goal has been achieved by experimental testing of various sets of direct and skip modes with and without inter-frame motion prediction. It was shown that either "all modes" have to be used or "all but not classic direct mode" should be used. The respective experimental results have been provided in the paper.
In this work we present an effective and computationally simple algorithm for image compression based on Hilbert Scanning of Embedded quadTrees (Hi-SET). It allows to represent an image as an embedded bitstream along ...
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In this work we present an effective and computationally simple algorithm for image compression based on Hilbert Scanning of Embedded quadTrees (Hi-SET). It allows to represent an image as an embedded bitstream along a fractal function. Embedding is an important feature of modern image compression algorithms, in this way Salomon in [1, pg. 614] cite that another feature and perhaps a unique one is the fact of achieving the best quality for the number of bits input by the decoder at any point during the decoding. Hi-SET possesses also this latter feature. Furthermore, the coder is based on a quadtree partition strategy, that applied to image transformation structures such as discrete cosine or wavelet transform allows to obtain an energy clustering both in frequency and space. The coding algorithm is composed of three general steps, using just a list of significant pixels. The implementation of the proposed coder is developed for gray-scale and color image compression. Hi-SET compressed images are, on average, 6.20dB better than the ones obtained by other compression techniques based on the Hilbert scanning. Moreover, Hi-SET improves the image quality in 1.39dB and 1.00dB in gray-scale and color compression, respectively, when compared with JPEG2000 coder.
In this paper, we propose an improved hardware-software codesign methodology for implementation on embedded system. The codesign flow begins with profiling of the system algorithm. With the analysis of profiling, cons...
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In this paper, we propose an improved hardware-software codesign methodology for implementation on embedded system. The codesign flow begins with profiling of the system algorithm. With the analysis of profiling, constraint of computation requirement for the application system, and the provided software-hardware resources on the specific embedded system platform, we partition the application system and allocate the system blocks on the embedded system with software and hardware resources to be a high performance codesign. For high efficient allocation of the system blocks, we created a cost-efficiency function to evaluate the efficiency of software and hardware on the implementation of the embedded system. In our study, a JPEG system is verified on the specific embedded system with the proposed codesign methodology. To achieve high efficient implementation on the specific embedded system platform, reducing the code size and hardware cost are the main tasks. Thus, low computation complexity and low hardware cost DCT/IDCT IPs are also proposed in this paper. Comparing with the design with pure software, the throughput of hardware-software codesign is 1.6 times of it. The cost-efficiency is improved around 1.715 times.
Accessing, searching, the information needed from multimedia database system became more important. Content-based retrieval and semantic querying applications use MPEG-7. Difference between traditional DBMS and MPEG-7...
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Accessing, searching, the information needed from multimedia database system became more important. Content-based retrieval and semantic querying applications use MPEG-7. Difference between traditional DBMS and MPEG-7 applications is the retrieving method. In this project, we evaluate the interface and functions of audio and visual multimedia query applications which are based on MPEG-7, according to MPEG-7 query format requirements developed by MPEG. This project represents different kinds of MPEG-7 multimedia applications, provides suggestions of design for the developers on the bases of evaluation criteria, and gives practical advice to the ISO standard documents.
Frame tampering is one of the common video forgery operations, which can change the video content and confuse the viewers by removing or inserting some special frames in the video streams. In this paper, a new method ...
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Frame tampering is one of the common video forgery operations, which can change the video content and confuse the viewers by removing or inserting some special frames in the video streams. In this paper, a new method is proposed to detect this kind of tampering based on the features of the power of high frequency area in the doctored sequences. Experiment results demonstrate that our proposed method can effectively detect frame tampering in the MPEG-2 streams.
Annotations allow users to associate additional information with existing resources. Using proprietary and closed systems on the Web, users are already able to annotate multimedia resources such as images, audio and v...
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Annotations allow users to associate additional information with existing resources. Using proprietary and closed systems on the Web, users are already able to annotate multimedia resources such as images, audio and video. So far, however, this information is almost always kept locked up and inaccessible to the Web of Data. We believe that an important step to take is the integration of multimedia annotations and the Linked Data principles. This should allow clients to easily publish and consume, thus exchange annotations about resources via commonWeb *** first present the current status of the Open Annotation Collaboration, an international initiative that is currently working on annotation interoperability specifications based on best practices from the Linked Data effort. Then we present two use cases and early prototypes that make use of the proposed annotation model and present lessons learned and discuss yet open technical issues.
The key to high performance of MPEG-4 video compression lies in an efficient reduction of spatial and temporal redundancy. The main idea of inter prediction techniques is quick checking of the entire search area with ...
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The key to high performance of MPEG-4 video compression lies in an efficient reduction of spatial and temporal redundancy. The main idea of inter prediction techniques is quick checking of the entire search area with efficient matching criterion viz. sum of absolute difference to eliminate the impossible or least matched candidates, followed by finer selection among the potentially best matched candidates. The macroblock with least SAD value will decide the motion vector. Due to object-based nature of MPEG-4, new SAD design with efficient computational ability, less area and less power in 0.18μm CMOS technology and operating frequency of 1.508GHz is proposed in the following paper.
This paper presents a novel technique to mitigate effects of data-path and memory errors in JPEG implementations. These errors are mainly caused by voltage scaling and process variation in scaled technologies. We char...
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This paper presents a novel technique to mitigate effects of data-path and memory errors in JPEG implementations. These errors are mainly caused by voltage scaling and process variation in scaled technologies. We characterize the data-path and memory errors and derive a probability distribution of the total number of errors. We propose an algorithm-specific technique that corrects most errors after quantization in the JPEG encoder by exploiting the characteristics of the quantized coefficients. The technique achieves high performance with small circuit overhead. Simulation results show that the proposed technique has a PSNR performance degradation of around 1.5 dB compared to the error-free case, and 4 dB improvement compared to the no correction case at compression rate of 0.75 bpp when BER = 10 -4 .
In this paper, we propose a wireless transmission of JPEG 2000 compressed video. The proposed system employs the next generation wireless LAN system based on IEEE802.11ac specification. It reaches more than 33 meter p...
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In this paper, we propose a wireless transmission of JPEG 2000 compressed video. The proposed system employs the next generation wireless LAN system based on IEEE802.11ac specification. It reaches more than 33 meter propagation distance by using 80MHz of bandwidth on the 5GHz band. In this system, video data is compressed by JPEG 2000 with error resilience tools. These tools improve error performance against wireless channel, and enable very high throughput communication. Computer simulations are used to evaluate the bit error performance's influences to the video quality. Finally, we present RTL design results of the proposed wireless LAN system.
In this paper we present a hardware architecture of the lifting-based, two-dimensional discrete wavelet transform. The proposed architecture implements both lossless (5/3) and lossy (9/7), multi-level DWT with an embe...
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In this paper we present a hardware architecture of the lifting-based, two-dimensional discrete wavelet transform. The proposed architecture implements both lossless (5/3) and lossy (9/7), multi-level DWT with an embedded, symmetric extension at tile boundaries. The wavelet processor is an integral part of the hardware JPEG2000 encoder oriented for HD video applications. This article discusses optimization methods, introduced to increase design throughput up to 800 MSamples/s and solutions that rationalize the circuit area. The results of synthesis for FPGA and ASIC technology are presented.
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