Complexity scalable algorithms are capable of trading resource usage for output quality in a near-optimal way. We present a complexity scalable motion estimation algorithm based on the 3-D recursive search block match...
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ISBN:
(纸本)0819444111
Complexity scalable algorithms are capable of trading resource usage for output quality in a near-optimal way. We present a complexity scalable motion estimation algorithm based on the 3-D recursive search block matcher. We introduce data prioritizing as a new approach to scalability. With this approach, we achieve a near-constant complexity and a continuous quality-resource distribution. While maintaining acceptable quality, it is possible to vary the resource usage from below 1 match-error calculation per block on the average to more than 5 match-error calculations per block on the average.
This paper presents a video watermarking scheme for copyright notification and protection. Each video frame is clustered into high motion and low motion regions. Dual watermarks are designed by exploiting video motion...
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ISBN:
(纸本)0819444111
This paper presents a video watermarking scheme for copyright notification and protection. Each video frame is clustered into high motion and low motion regions. Dual watermarks are designed by exploiting video motion, perceptual characteristics, and some other informative cues. They are embedded into certain macroblocks in these two regions respectively. The watermark in the low motion region is resilient to frame-level attacks such as frame dropping, frame averaging and frame reshuffling. The watermark in the high motion region is robust to statistical attacks. The detection does not need the original frame or any a priori index information of frames in video sequence. Good invisibility as well as strong robustness can be obtained. The experimental results validate the effectiveness of the system.
In this paper, we present the implementation of the robust detail preserving filters with complex noise suppression for imageprocessing applications. The designed filter is the consequential connection of two filters...
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ISBN:
(纸本)0819444111
In this paper, we present the implementation of the robust detail preserving filters with complex noise suppression for imageprocessing applications. The designed filter is the consequential connection of two filters. The first filter uses the value of central pixel of the filtering window to provide the preservation of fine details and the redescending M-estimators combined with the median estimator to provide impulsive noise rejection. The second filter uses the output of the first filter as the pre-estimator for an adaptive calculation in the redescending M-estimator. We investigated various types of influence functions in the M-estimator those are similar to the ones used in the Sigma filter to provide multiplicative noise suppression. The optimal values of the parameters of designed filters in presence of different noise mixture are determined. Different simulation data are presented in the paper and shown the statistical efficiency of the filters.
作者：
Ran, YLiao, QMLin, XGTsing Hua Univ
Dept Elect Engn State Key Lab Intelligent Technol & Syst State Key Lab Microwave & Digital Commun Beijing 100084 Peoples R China
The paper provides a novel algorithm for face rendering applications. Ensuring algorithms of low complexity to render virtual humans in VLBR networks is at the heart of our new facial rendering system. The system diff...
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ISBN:
(纸本)0819444111
The paper provides a novel algorithm for face rendering applications. Ensuring algorithms of low complexity to render virtual humans in VLBR networks is at the heart of our new facial rendering system. The system differs from others such as parametric animation models and interpolation solutions. The novelties include a dual segment growing algorithm and a heat diffusion rendering method. The extracting process takes into account information both in gradient domain and topographic feature. And segments are used to carry this information, which greatly reduces the transmitted packet size. Face rendering is based on this segment and is carried out like a heat diffusive process. Experimental results, as reported in following, prove this proposed system to be an efficient one. Furthermore this scheme can be extended to deal with more general video or image analysis and synthesis systems.
An encoder-based rate smoothing technique is developed to reduce the rate burstiness in video coding. At first, we propose a new source model to accurately estimate the rate-distortion (R-D) function of each video fra...
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ISBN:
(纸本)0819444111
An encoder-based rate smoothing technique is developed to reduce the rate burstiness in video coding. At first, we propose a new source model to accurately estimate the rate-distortion (R-D) function of each video frame with very low computational complexity. Based on the estimated R-D function, in the second step, we propose a rate smoothing algorithm to make a tradeoff between the constant bit rate and the constant picture quality. The tradeoff forces the output video stream to have both a smoothed rate shape and a consistent video presentation quality, which is highly desirable in video coding and transportation.
In this paper, we propose a watermarking method that does not requires an original image to extract embedded data. In our proposal, watermark information data are embedded by using the differences between the neighbor...
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ISBN:
(纸本)0819444111
In this paper, we propose a watermarking method that does not requires an original image to extract embedded data. In our proposal, watermark information data are embedded by using the differences between the neighboring wavelet coefficients of the lowest band in the wavelet domain. Though such a concept have been already proposed by H.S. Kim et al., the original image is needed for extracting embedded data in their method. We developed a new scheme which does not requires the original image to extract embedded data, by modifying the embedding algorithm. Simulation results show that our proposed scheme indicates good picture quality in the watermarked. image and robustness to some types of imageprocessing attacks including JPEG compression.
Uniform scalar quantizers are widely used in image coding. They are known to be optimum entropy constrained scalar quantizers within the high resolution assumption. In this paper, we focus on the design of nearly unif...
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ISBN:
(纸本)0819444111
Uniform scalar quantizers are widely used in image coding. They are known to be optimum entropy constrained scalar quantizers within the high resolution assumption. In this paper, we focus on the design of nearly uniform scalar quantizers for high performance coding of wavelet coefficients whatever the bitrate is. Some codecs use uniform scalar quantizers with a zero quantization bin size (deadzone) equal to two times the other quantization bin sizes (for example JPEG2000). We address the problem of deadzone size optimization using distortion rate considerations. The advantages of the proposed method are that the quantizer design is adapted to both the source statistics and the compression ratio. Our method is based on statistical information of the wavelet coefficients distribution. It provides experimental gains up to 0.19 dB.
In this paper, we propose a spatially adaptive wavelet thresholding method using a context model that has been inspired by our prior work on image coding. The proposed context model relies on an estimation of the weig...
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ISBN:
(纸本)0819444111
In this paper, we propose a spatially adaptive wavelet thresholding method using a context model that has been inspired by our prior work on image coding. The proposed context model relies on an estimation of the weighted variance in a local window of scale and space. Appropriately chosen weights are used to model the predominant correlations for a reliable statistical estimation. By iterating the context-based thresholding operation, a more accurate reconstruction can be achieved. Experimental results show that our proposed method yields significantly improved visual quality as well as lower mean squared error compared to the best recently published results in the denoising literature.
The performance of superresolution video enhancement relies heavily on the robustness and accuracy of motion estimation techniques. In this paper, we propose a novel and efficient block matching motion estimation algo...
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ISBN:
(纸本)0819444111
The performance of superresolution video enhancement relies heavily on the robustness and accuracy of motion estimation techniques. In this paper, we propose a novel and efficient block matching motion estimation algorithm suitable for estimating general motion existing in low resolution video frames. We exploit the spatial correlations between motion vectors and apply a coarse-to-fine multi-stage scheme to get the dense motion fields. We incorporate our motion estimation technique into the Projection Onto Convex Sets (POCS) superresolution framework. Experimental results show that the resulting high resolution images yield visual sharper enhanced images with significant PSNR improvement.
作者：
Yang, JDelp, EJPurdue Univ
Sch Elect & Comp Engn VIPER Video & Image Proc Lab W Lafayette IN 47907 USA
A synchronization scheme that can specify the start position of each macroblock in a compressed video bitstream for low data rate wireless applications is proposed by extending the Error Resilient Entropy Coding (EREC...
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ISBN:
(纸本)0819444111
A synchronization scheme that can specify the start position of each macroblock in a compressed video bitstream for low data rate wireless applications is proposed by extending the Error Resilient Entropy Coding (EREC) method. Our scheme is implemented in the form of a transcoder, placed before and after the channel, of a MPEG-4 Simple Profile bitstream. We compare our proposed technique using reconstructed video quality (measured in PSNR) and the length of the extra redundancy bits incurred by the transcoder with the error resilient tools of H.263(+). A simple syntax-based codeword repair method is also proposed so that the transcoder generates a MPEG-4 compliant bitstream which can then be decoded with a standard MPEG-4 decoder such as MoMuSys (FDIS V1.0).
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