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Multimedia Signal Processing, 2005 IEEE 7th Workshop on

Date Oct. 30 2005-Nov. 2 2005

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Displaying Results 1 - 25 of 149
  • Just-Noticeable Distortion Estimation for Image Pixels

    Publication Year: 2005 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4597 KB) |  | HTML iconHTML  

    This paper addresses the issue of incorporating contrast sensitivity function (CSF) into just-noticeable distortion (JND) estimation for image pixels in spatial domain. Based upon our earlier work on DCT-subband JND estimation, the resultant new pixel-wise JND model fully incorporates the spatial CSF, in addition to considerations of luminance adaptation and local contrast masking effect. Various ... View full abstract»

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  • Attention Based Symmetry Detection in Colour Images

    Publication Year: 2005 , Page(s): 1 - 4
    Cited by:  Patents (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4490 KB) |  | HTML iconHTML  

    Symmetry is a fundamental structure that is found to some extent in all images. It is thought to be an important factor in the human visual system for obtaining understanding and extracting semantics from visual material. This paper describes a method of detecting axes of reflective symmetry in images that does not require prior assumptions about the image being analysed. The approach is derived f... View full abstract»

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  • Perceptual Weighting in LSP-Based Multi-Description Coding for Real-Time Low-Bit-Rate Voice Over IP

    Publication Year: 2005 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4511 KB) |  | HTML iconHTML  

    This paper focuses on improving an LSP-based multi-description coding (MDC) scheme for concealing losses when real-time CELP-coded speech data is sent over IP networks. In that scheme, LSP vectors are interleaved because they are highly correlated and can be reconstructed by interpolations when packets are delayed or lost. However, excitation vectors are random in nature and must be replicated in ... View full abstract»

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  • A Triple User Characterization Model for Video Adaptation and Quality of Experience Evaluatio

    Publication Year: 2005 , Page(s): 1 - 4
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (5685 KB) |  | HTML iconHTML  

    This paper proposes the triple sensation-perception-emotion user characterization model for content adaptation and discusses adaptation tools and quality of experience metrics in light of this model. In the context of this paper, the utility would be associated to the sensorial, perceptual and emotional dimensions of the quality of experience. The adequate usage by the adaptation mechanism of avai... View full abstract»

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  • Region-based Pornographic Image Detection

    Publication Year: 2005 , Page(s): 1 - 4
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4738 KB) |  | HTML iconHTML  

    Recent advantages in digital images and networks have made pornographic images more accessible than ever. Methods of detecting pornographic images have been proposed in some existing work. However, the skin detection modules adopted are all pixel-based and skin region shape features are rarely properly used. This paper presents a framework for pornographic image detection based on skin region info... View full abstract»

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  • Flashlight Scene Detection for MPEG Videos

    Publication Year: 2005 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4516 KB) |  | HTML iconHTML  

    A new flashlight scene detection approach is presented. It focuses on two techniques: a new flashlight model based on the spatial-temporal characteristics of intensity value for the DC sequence, and a local threshold selection scheme using the sliding window. The advantages of this approach are its good performance for multi-frame and gradual flashlight scene cases, and local threshold selection. ... View full abstract»

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  • PeerStreaming: An On-Demand Peer-to-Peer Media Streaming Solution Based On A Receiver-Driven Streaming Protocol

    Publication Year: 2005 , Page(s): 1 - 4
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (5616 KB) |  | HTML iconHTML  

    We have developed PeerStreaming, an on-demand peer-to-peer (P2P) media streaming solution based on a receiver-driven streaming protocol. Unlike existing client-server based media streaming solution, where all clients go to a single server to retrieve the streaming media, in the PeerStreaming system, the media may be streamed from multiple peers. We use a receiver-driven protocol so that the peers ... View full abstract»

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  • Affine-Invariant Image Retrieval Based on Wavelet Interest Points

    Publication Year: 2005 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3884 KB) |  | HTML iconHTML  

    This paper presents an affine-in variant image retrieval approach based on wavelet-based detector, which uses the space-tree property of the transform coefficients to estimate the interest points. Meanwhile, in order to retrieve images compressed by wavelet algorithm such as JPEG2000, the detector only uses the partial bit-planes of the wavelet coefficients to detect the interest points. To provid... View full abstract»

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  • Adaptive Key Frame Selection Wyner-Ziv Video Coding

    Publication Year: 2005 , Page(s): 1 - 4
    Cited by:  Patents (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3597 KB) |  | HTML iconHTML  

    In Wyner-Ziv video coding, efficient compression is achieved by exploiting source statistics at the decoder only, which is radically different from conventional video coding. The performance of a Wyner-Ziv video codec is greatly dependent on the quality of reconstructed side information, which is an estimation version of current frame. Therefore the correlation between Wyner-Ziv (WZ) frame and key... View full abstract»

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  • Joint Source-Channel Decoding forH.264 Coded Video Stream

    Publication Year: 2005 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4353 KB) |  | HTML iconHTML  

    H.264 is the newest video coding standard and has achieved a significant improvement in coding efficiency. The entropy coding methods used in H.264 are CAVLC and CABAC. Although these two variable length code methods can achieve high compression, they are very sensitive to channel errors. This paper presents a joint source-channel MAP (maximum a posteriori probability) decoding method to dealing w... View full abstract»

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  • An Adaptive UEP_BTC_STBC_OFDM System for Robust Video Transmission

    Publication Year: 2005 , Page(s): 1 - 4
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4848 KB) |  | HTML iconHTML  

    An adaptive UEP_BTC_STBC_OFDM system is proposed to provide robust video transmission in dispersive fading channel. The system concatenates the Block Turbo Code (BTC) with the Space-Time Block Code (STBC) for an OFDM system, both the good error correcting capability of BTC and the concurrent large diversity gain characteristic of STBC can be achieved simultaneously. Furthermore, by employing the d... View full abstract»

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  • Context-Based Distributed Wavelet Video Coding

    Publication Year: 2005 , Page(s): 1 - 4
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4290 KB) |  | HTML iconHTML  

    In this paper a novel scalable video coder, based on the principle of distributed source coding with side information is proposed. Coding scalability is achieved by means of bitplane coding in the wavelet domain. The distributed coding paradigm is applied to encode the wavelet coefficients of a given frame, by considering those of the previous frame as side information. LDPC syndrome encoding with... View full abstract»

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  • Improvements to the Intra-Coding Modes Offered by H.264

    Publication Year: 2005 , Page(s): 1 - 4
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4934 KB) |  | HTML iconHTML  

    In this paper we investigate how to improve the overall prediction efficiency of intra frame coding in H.264, incorporating into the rate-distortion optimization framework several new prediction algorithms that can both fix some weaknesses of the existing 16times16 standard mode and partially fill the performance gap between available 4times4 and 16times16 strategies. Results show a good gain in p... View full abstract»

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  • An Integrated CBIR Scheme Based on Distance Transform

    Publication Year: 2005 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4663 KB) |  | HTML iconHTML  

    In this paper, we developed a new set of content-based descriptors that incorporated three primitive features of color images: chromatic, spatial, and spectral. Based on the distance transform, the proposed local relative distances pattern (LRDP) records the distance pattern of a color plane. Thus, LRDP can be regarded as an integration of chromatic and spatial information. The spectral informatio... View full abstract»

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  • A Piecewise Interpolation Method Based on Log-Least Square Error Criterion for HRTF

    Publication Year: 2005 , Page(s): 1 - 4
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4591 KB) |  | HTML iconHTML  

    This paper addresses the problem of accurately realizing the interpolation of spatially discrete head-related transfer function (HRTF) for synthesis of virtual auditory space. By analyzing the advantages and disadvantages of general bilinear interpolation method in 3D-sound, associating with human auditory system's mechanism of band-pass filtering and consulting critical bands of psychoacoustics, ... View full abstract»

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  • Gridmedia: A Practical Peer-to-Peer Based Live Video Streaming System

    Publication Year: 2005 , Page(s): 1 - 4
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (5437 KB) |  | HTML iconHTML  

    In this paper, we describe the design and implementation of a peer-to-peer based live video streaming system called Gridmedia. Gridmedia organizes the nodes into an unstructured overlay, and adopts a novel push-pull streaming mechanism to fetch data from the partner nodes. The pull mode in the unstructured overlay can work well with the high churn rate in P2P environment while the push mode can ef... View full abstract»

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  • Variable Density K-space Trajectories for Reducing Aliasing Artifacts in MRI Reconstruction

    Publication Year: 2005 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4152 KB) |  | HTML iconHTML  

    As is well known, the energy of an image is mostly concentrated in the low frequency components of k-space. In this paper, variable density Cartesian trajectory and variable density square spiral trajectory are proposed, oversampling the low frequency area while undersampling the high frequency area in k-space, in order to respectively reduce the aliasing artifact and shorten the scan time. Experi... View full abstract»

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  • Efficient Video Clip Retrieval Using Index Structure

    Publication Year: 2005 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4886 KB) |  | HTML iconHTML  

    Retrieving similar video clips from large video database requires high query efficiency, precision and recall, which remains a challenging problem since the traditional query algorithms are inefficient and time-consuming. In this paper, we adopt the high-dimensional index structure vector-approximation file (VA-file) to organize the video database, and propose a new similarity measure which takes ... View full abstract»

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  • Image Hiding by Non-uniform Generalized LSB and Dynamic Programming

    Publication Year: 2005 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4217 KB) |  | HTML iconHTML  

    A novel steganographic method based on non-uniform generalized LSB is proposed. Different from the traditional distortion measure MSE and PSNR, the structural-similarity based image quality assessment is used to measure the distortion caused by the data hiding. With the given maximum allowable distortion, dynamic programming is performed to find the optimum substitution depth vector to achieve the... View full abstract»

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  • A new rate control algorithm for macroblock-level coders

    Publication Year: 2005 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3478 KB) |  | HTML iconHTML  

    Rate control plays an important role in video coding. It regulates the coded bits to satisfy the channel rate while keeping good video quality. In Tsai's paper, a new algorithm was proposed which rearranging the macroblocks' coding order according to their significance in each frame. More complex macroblocks will be coded with more priority in coding order. But it is required to rearrange the codi... View full abstract»

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  • A Blind 3D Mesh Watermarking Scheme Based on Local Coordinate System

    Publication Year: 2005 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4613 KB) |  | HTML iconHTML  

    This paper develops a novel watermarking method for 3D meshes. In the algorithm, one local coordinate system is created for each embedding primitive first. Then the watermark, which is a readable string, is encoded into a binary sequence and embedded bit by bit by modifying the position of vertices' projections in the local coordinate system. The watermarked model is achieved by calculating the ne... View full abstract»

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  • Extraction of Individual Perception Features for imagery-based Image Retrieval

    Publication Year: 2005 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4767 KB) |  | HTML iconHTML  

    In this paper, with the objective to retrieving digital collections more intuitively and flexible, we proposed an approach of compact feature extraction and retrieval of images which matched the human perceptual image similarity criteria. For this, the eigen and difference SGLD (space gray level dependence) matrices were used to extract the features of images. The associations of the extracted fea... View full abstract»

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  • Distortion-Aware Multimedia Authentication using an Enhanced Hash Function

    Publication Year: 2005 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (5065 KB) |  | HTML iconHTML  

    A new type of hash function called the distance preserving (DP) hash function is proposed to tackle the shortcoming of the traditional bit-wise multimedia authentication scheme. A DP hash function accepts two inputs: the message and a security key. It is indistinguishable from a conventional hash function under different security keys. However, if the same security key is applied, the DP hash func... View full abstract»

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  • Wavelet-Based Image Interpolation Using Phase-Shift Compensation

    Publication Year: 2005 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4352 KB) |  | HTML iconHTML  

    Image interpolation in the wavelet domain usually takes advantage of probabilistic models of intra-scale statistics and inter-scale dependency. Parameter estimation for the probabilistic model of wavelet coefficients is essential to the wavelet-domain interpolation. However, phase uncertainty, one well-known drawback of the orthogonal wavelet transforms, makes it difficult to estimate parameters. ... View full abstract»

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  • Comparison Between Multiple Description and Single Description Video Coding With Forward Error Correction

    Publication Year: 2005 , Page(s): 1 - 4
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4419 KB) |  | HTML iconHTML  

    Video streaming over packet switched best-effort networks is a challenging topic, due to low latency, scalability and fault tolerance requirements. Many techniques can be used to deal with delay, loss and the time-varying nature of best-effort networks. In this paper we compare two techniques to improve the performance of video streaming, i.e., a multiple description (MD) scheme based on spatial p... View full abstract»

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