Subjective study on compressed asymmetric stereoscopic video

Aflaki, Payman; Hannuksela, Miska M.; Häkkinen, Jukka; Lindroos, Paul; Gabbouj, Moncef

doi:10.1109/icip.2010.5650661

Cited by 60 publications

(32 citation statements)

References 5 publications

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“…This is in agreement with the conclusion achieved in [4,16]. Moreover, the subjective results confirm that PS1/2 performed the best in the lower and higher bitrates.…”

Section: Resultssupporting

confidence: 92%

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Cross-asymmetric mixed-resolution 3D video compression

Aflaki

Hannuksela

Homayouni

et al. 2012

2012 3dtv-Conference: The True Vision - Capture, Transmission and Display of 3D Video (3dtv-Con)

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Conventional mixed-resolution (MR) stereoscopic video where one view has full resolution (FR) and the other view has a lower resolution has shown to provide similar subjective quality compared to symmetric FR stereoscopic video while decreasing the encoding complexity considerably. In this paper, we propose a new cross-asymmetric mixed-resolution scheme where both views have a lower resolution compared to FR but downsampling is applied in horizontal direction for one view while the other view is vertically downsampled. Subjective results comparing the proposed scheme with the conventional MR and the symmetric FR schemes show that the perceived quality of the proposed scheme is higher than that of the two other schemes. Moreover, the computational complexity and memory requirements also are reduced thanks to the decreased number of pixels involved in the encoding and decoding processes.

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“…This is in agreement with the conclusion achieved in [4,16]. Moreover, the subjective results confirm that PS1/2 performed the best in the lower and higher bitrates.…”

Section: Resultssupporting

confidence: 92%

“…For example, in [4] a set of subjective tests on encoded FR and MR stereoscopic videos were performed under the same bitrate constraint. The results show that the MR stereoscopic video with downsampling ratio 1/2, applied both vertically and horizontally, performed similarly to the FR in most cases.…”

Section: Introductionmentioning

confidence: 99%

Cross-asymmetric mixed-resolution 3D video compression

Aflaki

Hannuksela

Homayouni

et al. 2012

2012 3dtv-Conference: The True Vision - Capture, Transmission and Display of 3D Video (3dtv-Con)

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“…It is noticed that in the stereoscopic vision the view with relatively better quality contributes more to the overall stereoscopic image quality [4]. Thus, theoretically, when one viewpoint of a stereoscopic image is coded in such a way that the high quality can be maintained, the other viewpoint of the stereoscopic image can then be compressed to a greater extent without inducing visible artifacts of stereoscopic perception.…”

Section: Introductionmentioning

confidence: 99%

A novel texture-based asymmetric visibility threshold model for stereoscopic video coding

Jiang

et al. 2018

J Image Video Proc.

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Asymmetric stereoscopic video coding is becoming increasingly popular, as it can reduce the bandwidth required for stereoscopic 3D delivery without degrading the visual quality. Based on the perceptual theory of binocular suppression, the left and right views of stereoscopic video are coded with different levels of quality. However, existing asymmetric perceptual coding approaches on stereoscopic video mainly focus on the threshold of whole image distortion. It is not so reasonable to use a single unified rather than adaptable perception threshold for a random natural stereoscopic image as the texture complexity typically varies in different blocks of image. In this paper, we generated an asymmetrically distorted stereoscopic image set with different texture densities and conducted a large number of subjective perceptual experiments. A strong correlation between the asymmetrical visibility threshold and texture complexity is revealed from the subjective experiments, and a texture-based asymmetrical visibility threshold model (TAVT) is established. Then, the model is extended to the hierarchical B picture (HBP) coding architecture and an asymmetric stereoscopic video coding method is proposed based on the TAVT model. Experimental results show that the proposed method can effectively reduce the unnecessary perceptual redundancy without visual quality degradation. Especially, it is more efficient for high bitrate configuration.

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“…However, this argument can be addressed with the binocular rivalry theory [11] claiming that stereoscopic vision in the human visual system (HVS) fuses the images of an asymmetric quality stereoscopic image-pair so that the perceived quality is closer to that of the higher quality view. Several subjective quality evaluation studies have been conducted to investigate the use of the binocular rivalry theory in stereoscopic video coding [12][13][14][15]. Another work presented in [16] showed the applicability of asymmetric coding for MVC-like coding by encoding dependent views with a coarser quantization step compared to the base view.…”

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confidence: 99%

Coding of mixed-resolution multiview video in 3D video application

Aflaki

Joachimiak

et al. 2013

2013 IEEE International Conference on Image Processing

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The emerging MVC+D standard specifies the coding of Multiview Video plus Depth (MVD) data for enabling advanced 3D video applications. MVC+D specifications define the coding of all views of MVD at equal spatial resolution and apply a conventional MVC technique for coding the multiview texture and the depth independently. This paper presents a modified MVC+D coding scheme, where only the base view is coded at the original resolution whereas dependent views are coded at reduced resolution. To enable inter-view prediction, the base view is downsampled within the MVC coding loop to provide a relevant reference for dependent views. At the decoder side, the proposed scheme consists of a post-processing scheme which upsamples of the decoded views to their original resolution. The proposed scheme is compared against the original MVC+D scheme and an average of 4% delta bitrate reduction (dBR) in the coded views and 14.5% of dBR in the synthesized views are reported.Index Terms-3DV, MVC, asymmetric coding, spatial resolution, synthesized views INTRODUCTIONThe Moving Picture Experts Group (MPEG) has recently started 3D Video (3DV) standardization to enable support of advanced 3DV applications. The concept of advanced 3DV applications assumes that users can perceive a selected stereo-pair from numerous available views at the decoder side. Examples of such applications includes varying baseline to adjust the depth perception and multiview autostereoscopic displays (ASDs). Considering the complexity of capturing 3D scenes and the limitations in the distribution technologies, it is not possible to deliver a sufficiently large number of [4] for the independent coding of texture and depth. As a result, a forward compatibility with MVC specification is preserved, and texture views of MVC+D bitstreams can be decoded with a conventional MVC decoder. The MVC+D specification was implemented in 3DV-ATM reference software [8] and was used in this study.A possible solution to further reduce the bitrate and/or complexity of 3DV applications is to reduce the spatial resolution of a number of video views compared to the original resolution while preserving the original resolution for the remaining views. At the decoder side, views coded at the reduced resolution are upsampled to the original one using either conventional linear upsampling [9], or advanced super resolution techniques [10] that would benefit from multiview representation and the presence of depth. Being applied to texture component of MVD, this would result in a mixed-resolution texture representation and a significant bitrate reduction is hence expected.It is obvious, that a scheme with a mixed-resolution texture representation would result in decoded views (e.g. stereoscopic image-pair) with different quality, which may affect stereoscopic perception. However, this argument can be addressed with the binocular rivalry theory [11] claiming that stereoscopic vision in the human visual system (HVS) fuses the images of an asymmetric quality stereoscopic image-pair s...

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Subjective study on compressed asymmetric stereoscopic video

Cited by 60 publications

References 5 publications

Cross-asymmetric mixed-resolution 3D video compression

Cross-asymmetric mixed-resolution 3D video compression

A novel texture-based asymmetric visibility threshold model for stereoscopic video coding

Coding of mixed-resolution multiview video in 3D video application

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