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RISS 인기검색어
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- 저자 : Tillo (검색결과 6 건)
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Uni-directional Hybrid Distributed Video Coding With Macroblock Classification
Tammam Tillo,Hoyoung Lee,Byeungwoo Jeon 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
Distributed Video Coding (DVC) is a new coding paradigm suitable for extremely low complexity video encoders. This makes it suitable for limited resources applications such as sensor network. Wyner-Ziv video coding, the most representative method in DVC uses channel coding, such as turbo code or LDPC code, to reconstruct a frame based on side information. It is important to transmit just right amount of channel coded data, and this problem has been generally tackled by using a feedback channel. In this paper, we propose a hybrid distributed video coding approach which combines motion compensated prediction and Wyner-Ziv video coding. This allows to accurately estimate the required channel code rate, thus eliminating the feedback channel. Experimental results indicate that the proposed method achieves good performance while maintaining low complexity.
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Multiple Description Coding for H.264/AVC With Redundancy Allocation at Macro Block Level
Chunyu Lin,Tillo, Tammam,Yao Zhao,Byeungwoo Jeon IEEE 2011 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDE Vol.21 No.5
<P>In this paper, a novel multiple description video coding scheme is proposed to insert and control the redundancy at macro block (MB) level. By analyzing the error propagation paths, the relative importance of each MB is determined. The paths, in practice, depend on both the video content and the adopted video coder. Considering the relative importance of the MB and the network status, an unequal protection for the video data can be realized to exploit the redundancy effectively. In addition, a simple and effective approach is introduced to tune the quantization parameter for the variable rate coding case. The whole scheme is implemented in H.264/AVC by employing its coding options, thus generating descriptions that are compatible with the baseline profile and extended profile of H.264/AVC. Due to its general property, the proposed approach can be employed for other hybrid video codecs. The results demonstrate the advantage of the proposed approach over other H.264/AVC multiple description schemes.</P>
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Texture Plus Depth Video Coding Using Camera Global Motion Information
Cheng, Fei,Tillo, Tammam,Xiao, Jimin,Jeon, Byeungwoo IEEE 2017 IEEE transactions on multimedia Vol.19 No.11
<P>In video coding, traditional motion estimation methods work well for videos with camera translational motion, but their efficiency drops for other motions, such as rotational and dolly motions. In this paper, a motion-information-based three-dimensional (3D) video coding method is proposed for texture plus depth 3D video. The synchronized global motion information of the camera is obtained to assist the encoder improve its rate-distortion performance by projecting the temporal neighboring texture and depth frames into the position of the current frame, using the depth and camera motion information. Then, the projected frames are added into the reference buffer list as virtual reference frames. As these virtual reference frames could be more similar to the current to-be-encoded frame than the conventional reference frames, the required bits to represent the residual will be reduced. The experimental results demonstrate that the proposed scheme enhances the coding performance for all camera motion types and for various scene settings and resolutions using H.264 and HEVC standards, respectively. With the computer graphic sequences, for H.264, the average gain of texture and depth coding are up to 2 dB and 1 dB, respectively. For HEVC and HD resolution sequences, the gain of texture coding reaches 0.4 dB. For realistic sequences, up to 0.5 dB gain (H.264) is achieved for the texture video, while up to 0.7 dB gain is achieved for the depth sequences.</P>
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Hybrid Wyner-Ziv Video Coding with No Feedback Channel
Hoyoung Lee,Tillo Tammam,Byeungwoo Jeon 대한전자공학회 2016 IEIE Transactions on Smart Processing & Computing Vol.5 No.6
In this paper, we propose a hybrid Wyner-Ziv video coding structure that combines conventional motion predictive video coding and Wyner-Ziv video coding to eliminate the feedback channel, which is a major practical problem in applications using the Wyner-Ziv video coding approach. The proposed method divides a hybrid frame into two regions. One is coded by a motion predictive video coder, and the other by the Wyner-Ziv coding method. The proposed encoder estimates side information with low computational complexity, using the coding information of the motion predictive coded region, and estimates the number of syndrome bits required to decode the region. The decoder generates side information using the same method as the encoder, which also reduces the computational complexity in the decoder. Experimental results show that the proposed method can eliminate the feedback channel without incurring a significant rate-distortion performance loss.
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Fortin, Dale A.,Tillo, Shane E.,Yang, Guang,Rah, Jong-Cheol,Melander, Joshua B.,Bai, Suxia,Soler-Cedeñ,o, Omar,Qin, Maozhen,Zemelman, Boris V.,Guo, Caiying,Mao, Tianyi,Zhong, Haining Society for Neuroscience 2014 The Journal of neuroscience Vol.34 No.50
<P>Stoichiometric labeling of endogenous synaptic proteins for high-contrast live-cell imaging in brain tissue remains challenging. Here, we describe a conditional mouse genetic strategy termed endogenous labeling via exon duplication (ENABLED), which can be used to fluorescently label endogenous proteins with near ideal properties in all neurons, a sparse subset of neurons, or specific neuronal subtypes. We used this method to label the postsynaptic density protein PSD-95 with mVenus without overexpression side effects. We demonstrated that mVenus-tagged PSD-95 is functionally equivalent to wild-type PSD-95 and that PSD-95 is present in nearly all dendritic spines in CA1 neurons. Within spines, while PSD-95 exhibited low mobility under basal conditions, its levels could be regulated by chronic changes in neuronal activity. Notably, labeled PSD-95 also allowed us to visualize and unambiguously examine otherwise-unidentifiable excitatory shaft synapses in aspiny neurons, such as parvalbumin-positive interneurons and dopaminergic neurons. Our results demonstrate that the ENABLED strategy provides a valuable new approach to study the dynamics of endogenous synaptic proteins <I>in vivo</I>.</P>
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Depth Map Coding Using Histogram-Based Segmentation and Depth Range Updating
( Chunyu Lin ),( Yao Zhao ),( Jimin Xiao ),( Tammam Tillo ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.3
In texture-plus-depth format, depth map compression is an important task. Different from normal texture images, depth maps have less texture information, while contain many homogeneous regions separated by sharp edges. This feature will be employed to form an efficient depth map coding scheme in this paper. Firstly, the histogram of the depth map will be analyzed to find an appropriate threshold that segments the depth map into the foreground and background regions, allowing the edge between these two kinds of regions to be obtained. Secondly, the two regions will be encoded through rate distortion optimization with a shape adaptive wavelet transform, while the edges are lossless encoded with JBIG2. Finally, a depth-updating algorithm based on the threshold and the depth range is applied to enhance the quality of the decoded depth maps. Experimental results demonstrate the effective performance on both the depth map quality and the synthesized view quality.
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