Fast encoding techniques for Multiview Video Coding

Khattak, Shadan; Hamzaoui, Raouf; Ahmad, Shakeel; Frossard, Pascal

doi:10.1016/j.image.2012.12.010

Cited by 10 publications

(9 citation statements)

References 16 publications

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“…Hence, an adaptive search range strategy was proposed which reduced the encoding time of the JMVM 6.0 encoder by around 40% with negligible difference in the RD performance. The results of this contribution were published in [30] and [31].…”

Section: Discussionmentioning

confidence: 99%

“…The proposed technique reduced the encoding time of the JMVM 6.0 encoder by around 50% without compromising much on the RD performance. The results of this contribution were published in [31].…”

Section: Discussionmentioning

confidence: 99%

“…• A fast disparity estimation method [30,31] that exploits the correlation between the temporal level of a frame, and the view-neighbourhood of a macroblock to reduce the search range for disparity estimation. It achieves 35.28% reduction of encoding time, on average, compared to the standard JMVM 6.0 [32] reference software implementation.…”

Section: Contributions Of the Thesismentioning

confidence: 99%

“…• A fast motion and disparity estimation method [31] that exploits the geometric consistency between the motion and disparity vectors of two consecutive stereo video frame pairs to reduce the motion and disparity search ranges. It achieves 41.78% reduction of encoding time, on average, compared to the standard JMVM 6.0 [32] reference software implementation.…”

Section: Contributions Of the Thesismentioning

confidence: 99%

“…• A novel global solution for low-complexity multiview video coding [31,33]. The solution integrates state-of-the-art algorithms with the above two methods into a unique framework to achieve an encoding time saving of over 93% on average, compared to the standard JMVM 6.0 [32] reference software implementation.…”

Section: Contributions Of the Thesismentioning

confidence: 99%

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Low-complexity multiview video coding

Khattak

Hamzaoui

Ahmad

et al. 2012

2012 Picture Coding Symposium

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Abstract3D video is a technology that has seen a tremendous attention in the recent years. Multiview Video Coding (MVC) is an extension of the popular H.264 video coding standard and is commonly used to compress 3D videos. It offers an improvement of 20% to 50% in compression efficiency over simulcast encoding of multiview videos using the conventional H.264 video coding standard. However, there are two important problems associated with it: (i) its superior compression performance comes at the cost of significantly higher computational complexity which hampers the real-world realization of MVC encoder in applications such as 3D live broadcasting and interactive Free Viewpoint Television (FTV), and (ii) compressed 3D videos can suffer from packet loss during transmission, which can degrade the viewing quality of the 3D video at the decoder. This thesis aims to solve these problems by presenting techniques to reduce the computational complexity of the MVC encoder and by proposing a consistent error concealment technique for frame losses in 3D video transmission.The thesis first analyses the complexity of the MVC encoder. It then proposes two novel techniques to reduce the complexity of motion and disparity estimation. The first method achieves complexity reduction in the disparity estimation process by exploiting the relationship between temporal levels, type of macroblocks and search ranges while the second method achieves it by exploiting the geometrical relationship between motion and disparity vectors in stereo frames. These two methods are then combined with other state-of-the-art methods in a unique framework where gains add up. Experimental results show that the proposed low-complexity framework can reduce the encoding time of the standard MVC encoder by over 93% while maintaining similar compression efficiency performance.The addition of new View Synthesis Prediction (VSP) modes to the MVC encoding framework improve the compression efficiency of MVC. However, testing additional modes comes at the cost of increased encoding complexity. In order to reduce the encoding complexity, the thesis, next, proposes a bayesian early mode decision technique for a VSP enhanced MVC coder. It exploits the statistical similarities between the RD costs of the VSP SKIP mode in neighbouring views to terminate the mode decision process early. Results indicate that the proposed technique can reduce the encoding time of the enhanced MVC coder by over 33% at similar compression efficiency levels.Finally, compressed 3D videos are usually required to be broadcasted to a large number of users where transmission errors can lead to frame losses which can degrade the video quality at the decoder. A simple reconstruction of the lost frames can lead to inconsistent reconstruction of the 3D scene which may negatively affect the viewing experience of a user. In order to solve this problem, the thesis proposes, at the end, a consistency model for recovering frames lost during transmission. The proposed consistency model is used to evaluate...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Contributions Of the Thesismentioning

confidence: 99%

Section: Contributions Of the Thesismentioning

confidence: 99%

Section: Contributions Of the Thesismentioning

confidence: 99%

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