Interactive quality assessment for asymmetric coding of 3D video

Ozbek, N.; Ertan, Gizem; Karakuş, Oktay

doi:10.1109/3dtv.2011.5877199

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…Saygili et al [2010] considered the effect of asymmetric coding in the subjective quality of 3D stereo video. Ozbek et al [2011] proposed another interactive method to measure the perceptual quality of asymmetric coded video. In Umar et al [2011], subjective tests are performed to validate the 3D video quality and depth perception.…”

Section: Quality Assessment In Multiview 3d Videomentioning

confidence: 99%

A new methodology to derive objective quality assessment metrics for scalable multiview 3D video coding

Roodaki

Hashemi

Shirmohammadi

2012

ACM Trans. Multimedia Comput. Commun. Appl.

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With the growing demand for 3D video, efforts are underway to incorporate it in the next generation of broadcast and streaming applications and standards. 3D video is currently available in games, entertainment, education, security, and surveillance applications. A typical scenario for multiview 3D consists of several 3D video sequences captured simultaneously from the same scene with the help of multiple cameras from different positions and through different angles. Multiview video coding provides a compact representation of these multiple views by exploiting the large amount of inter-view statistical dependencies. One of the major challenges in this field is how to transmit the large amount of data of a multiview sequence over error prone channels to heterogeneous mobile devices with different bandwidth, resolution, and processing/battery power, while maintaining a high visual quality. Scalable Multiview 3D Video Coding (SMVC) is one of the methods to address this challenge; however, the evaluation of the overall visual quality of the resulting scaled-down video requires a new objective perceptual quality measure specifically designed for scalable multiview 3D video. Although several subjective and objective quality assessment methods have been proposed for multiview 3D sequences, no comparable attempt has been made for quality assessment of scalable multiview 3D video. In this article, we propose a new methodology to build suitable objective quality assessment metrics for different scalable modalities in multiview 3D video. Our proposed methodology considers the importance of each layer and its content as a quality of experience factor in the overall quality. Furthermore, in addition to the quality of each layer, the concept of disparity between layers (inter-layer disparity) and disparity between the units of each layer (intra-layer disparity) is considered as an effective feature to evaluate overall perceived quality more accurately. Simulation results indicate that by using this methodology, more efficient objective quality assessment metrics can be introduced for each multiview 3D video scalable modalities. ACM Reference Format:Roodaki, H., Hashemi, M. R., and Shirmohammadi, S. 2012 A new methodology to derive objective quality assessment metrics for scalable multiview 3D video coding. ACM Trans. Multimedia Comput.

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Section: Quality Assessment In Multiview 3d Videomentioning

confidence: 99%

A new methodology to derive objective quality assessment metrics for scalable multiview 3D video coding

Roodaki

Hashemi

Shirmohammadi

2012

ACM Trans. Multimedia Comput. Commun. Appl.

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“…Figure 5 gives a screenshot of the SESVIQ test method. The SESVIQ was developed as an extension of the SAMVIQ for stereoscopic videos and presented in [27] by comparing it to the DSCQS. The interactive evaluation is carried out scene after scene.…”

Section: Visual Tests: Testing Proceduresmentioning

confidence: 99%

Perceptual quality evaluation of asymmetric stereo video coding for efficient 3D rate scaling

Ozbek¹,

Ertan²,

Karakuş³

2014

Turk J Elec Eng & Comp Sci

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Abstract:In 3D perception, the binocular suppression of the human vision, perceiving high quality 3D video in the case of a view in higher quality, can be exploited in asymmetric stereo video coding for efficient 3D rate scaling. Hence, the best stereo rate-visual distortion performance may be gained by asymmetric coding, which is the reduction of the spatial and/or quantization resolution of the low-quality view, while keeping the high-quality view in full resolution.However, how to determine the level of asymmetry and what type of scaling should be chosen are still in question. In this work, we try to assess the overall performance of the scalability options with several test contents. The test videos are encoded at critical bitrates with symmetric options and spatial or signal-to-noise ratio (SNR) asymmetric coding, and are subjectively evaluated in a stereo-polarized projection 3D display system. Two different types of evaluation methodologies are used: the Double-Stimulus Continuous-Quality Scale (DSCQS) and Subjective Evaluation of Stereo Video Quality (SESVIQ). Dense visual tests show that the spatial scaling is generally inferior when compared to SNR scaling, except that high motion scenes and symmetric SNR are more preferable for a higher bitrate. The characteristics of the video content should be taken into consideration for efficient stereo rate scaling.

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Performance Comparison of Subjective Assessment Methods for Stereoscopic 3D Video Quality

Kawano

Yamagishi

Hayashi

2014

IEICE Trans. Commun.

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The International Telecommunication Union has standardized many subjective assessment methods for stereoscopic threedimensional (3D) and 2D video quality. The same methods are used for 3D and 2D videos. The assessment time, stability, and discrimination ability, which means the ability to identify differences in video quality, are important factors in subjective assessment methods. Many studies on these factors have been done for 2D video quality. However, these factors for 3D video quality have not been sufficiently studied. To address this, we conduct subjective quality assessments for 3D and 2D videos using the absolute category rating (ACR), degradation category rating (DCR), and double stimulus continuous quality-scale (DSCQS) methods that are defined in ITU Recommendations. We first investigate the Pearson's correlation coefficients and Spearman's rank correlation coefficients between different pairings of the three methods to clarify which method is most efficient in terms of assessment time. The different pairings of the three methods exhibit high coefficients. These results indicate that the order relation of the mean opinion score (MOS) and the distance between the MOSs for these methods are almost the same. Therefore, for generally investigating the quality characteristics, the ACR method is most efficient because it has the shortest assessment time. Next, we analyze the stability of these subjective assessment methods. We clarify that the confidence intervals (CIs) of the MOSs for 3D video are almost the same as those for 2D video and that the stability of the DCR method is higher than that of the other methods. The DSCQS method has the smallest CIs for high-quality video. Finally, we investigate the discrimination ability of these subjective assessment methods. The results show that the DCR method performs better than the others in terms of the number of paired MOSs with a significant difference for low-quality video. However, we confirm that the DSCQS method performs better than the others for high-quality video.

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Interactive quality assessment for asymmetric coding of 3D video

Cited by 3 publications

References 5 publications

A new methodology to derive objective quality assessment metrics for scalable multiview 3D video coding

A new methodology to derive objective quality assessment metrics for scalable multiview 3D video coding

Perceptual quality evaluation of asymmetric stereo video coding for efficient 3D rate scaling

Performance Comparison of Subjective Assessment Methods for Stereoscopic 3D Video Quality

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