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Bit-stream Extraction to Maximize Perceptual Quality Using Quality Information Table in SVC |
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2005
. 03 ~ current |
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In scalable video coding (SVC), video quality can be controlled by bit-stream extraction. The bit-stream extraction is to extract network abstraction layer (NAL) units for the required quality. Since scalable bit-stream is packed in NAL units, quality control of SVC video is highly related to NAL unit extraction policy at a given bit-rate. Therefore, effective extraction policy is required to provide SVC video with optimal quality. In this project, a SVC bit-stream extraction method based on perceptual quality is proposed.
The main goal of this work is to find the optimal extraction policy for SVC bit-stream that contain the spatial, temporal, and SNR scalability at a given bit-rate. Also, to consider perceptual quality relied on video characteristics, the video segments are classified into different classes, namely action, crowd, dialog, scenery, and text&graphic.
As a result of a subjective test on the classified video scenes, consistent characteristic of perceptual quality preference is achieved. Based on this, quality information table (QIT) has been determined for each class which guides the bit-stream extraction process. The determined QIT is applied to SVC bit-stream extraction depending on to which class a video segment belongs. In the experiment, the proposed extraction scheme is applied for SVC bit-stream extraction belongs to action class. Extraction policy to maximize perceptual quality of action class is applied based on QIT for action class. The extracted video and multi-dimensional scalability resulted from the proposed scheme are also described.
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| The goal of this project is the followings |
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| Fig. 1. Quility Control System for Ubiquitous Computing Supported Residential Environment |
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| Fig. 2. Conceptual framework for SVC bit-stream extraction using quality information table |
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In Figure 2, the extractor performs SVC bit-stream extraction based on the use quality information table(QIT) of video class (semantic concept). The predefined semantic concept is given to the extractor with SVC bit-stream. The extractor reads the semantic concept of the bit-stream and finds the QIT for the given semantic concept. As mentioned earlier, depending on semantic concept, extractor performs different extraction. As a constraint, available bit-rate is estimated by feedback from the client. At a given available bit-rate, the extractor determines the proper QI in QIT and proceeds NAL unit extraction process applying the determined QI to decision process for which NAL unit should be extracted. The Quality information(QI) informs the extractor of dependency dependency id(DI), temporal level(TL), and relative bit-rate. With informed quality information, extractor performs extraction selecting proper NAL unit including the proper DIs and TLs to meet an available bandwidth allocation.
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The goal of this project is the followings |
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Research subjects |
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Research for SVC bit-stream extraction scheme and select best quality using perceptual quality preference
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Contents-aware quality selection: Technology for consideration of perceptual quality itself as well as dependency on characteristic of video content
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T. C. Thang, Y. J. Jung, Y. M. Ro, "Modality conversion for QoS management in Universal Multimedia Access", IEE Proceedings - Vision, Image and Signal Processing, Vol. 152, Issue 03, pp.374-384, June. 2005.
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T. C. Thang, Y. J. Jung, Y. M. Ro, "Effective adaptation of multimedia documents with modality conversion", EURASIP Signal Processing: Image Communication Journal,
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Young Suk Kim, Yong Ju Jung, Truong Cong Thang, and Yong Man Ro,ˇ±Bit-stream extraction to maximize perceptual quality using quality information table in SVCˇ±, Proc. SPIE VCIP, Jan. 2006, San Jose
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T. C. Thang, Y. S. Kim, C. S. Kim, Y. M. Ro, "Quality Models for Audiovisual Streaming", Proc. SPIE Electronic Imaging, Vol. 6059, Jan. 2006, San Jose
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T. C. Thang, Y. J. Jung, Y. M. Ro, "Semantic Quality for Content-Aware Video Adaptation" (in Special Session of Content-Aware Video Coding and Communication), Proc. IEEE MMSP2005, Shanghai, Oct. 2005.
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Y. J. Jung, T. C. Thang, Y. M. Ro, "Distortion Measures in MPEG-Compressed Domain for Multidimensional Transcoding", Proc. IEEE MMSP2005, Shanghai, Oct. 2005.
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Yong Ju Jung, Young Suk Kim, Duck Yeon Kim, Jea Gon Kim, Jin Woo Hong, and Yong Man Ro,"Analysis of Human Perception for Semantic Concept-based Video Transcoding," Int. Workshop Advanced Image Tech. (IWAIT2005), Vol.1, pp 251-256, Jan. 2005
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Dongjun Suh, Hyun Sang Cho, Jayoung Goo, Kyung S. Park, Minsoo Hahn, ˇ°Virtual Navigation System for the disabled by Motor Imagery,ˇ± Proc. 1st International Conference on Industrial Electronics, Technology & Automation/ CISSE 05 ,December 10-20, 2005
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Jayoung Goo, Dongjun Suh, Hyun Sang Cho, Kyung S. Park, Minsoo Hahn, "A BCI based Virtual Control Testbed for Motion DIsabled People," Proc. 15th International Conference on Artificial Reality and Telexistence,December 5th-8th, 2005, University of Canterbury, Christchurch, New Zealand
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