Impact of downsampling ratio in mixed-resolution stereoscopic video

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

doi:10.1109/3dtv.2010.5506601

Cited by 19 publications

(36 citation statements)

References 11 publications

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“…The "full" resolution was selected to occupy as large an area as possible on the used monitor with a reasonable downsampling ratio from the original resolution. As eye dominance was shown to have no impact on which view is provided with a better quality [5], only one set of MR sequences was prepared. The right view was kept in "full" resolution while the left view was downsampled and subsequently upsampled to the "full" resolution.…”

Section: Preparation Of the Test Stimulimentioning

confidence: 99%

“…The right view was kept in "full" resolution while the left view was downsampled and subsequently upsampled to the "full" resolution. Downsampling ratios 1/2, 3/8, and 1/4 were selected and symmetrically applied along both coordinate axes in order to keep the results easily comparable with those presented in [5]. The filters of the JSVM reference software of the Scalable Video Coding standard were used in the downsampling and upsampling operations [5].…”

Section: Preparation Of the Test Stimulimentioning

confidence: 99%

“…In [5], the impact of downsampling ratio in MR stereoscopic video was studied. Downsampling ratios 1/2, 3/8, and 1/4 were applied vertically and horizontally.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, a subjective test for uncompressed MR stereoscopic video is presented using a test setup similar to but not the same as in [5]. The obtained subjective results are compared to the previous subjective test [5] to see if the above-mentioned breakpoint is valid for a different test setup.…”

Section: Introductionmentioning

confidence: 99%

“…The obtained subjective results are compared to the previous subjective test [5] to see if the above-mentioned breakpoint is valid for a different test setup. Moreover, a novel logarithmic estimation of subjective ratings as a function of PPD values of viewing angle is introduced.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of subjective quality for mixed-resolution stereoscopic video

Aflaki

Hannuksela

Hakala

et al. 2011

2011 3DTV Conference: The True Vision - Capture, Transmission and Display of 3D Video (3dtv-Con)

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In mixed-resolution (MR) stereoscopic video, one view is presented with a lower resolution compared with the other one; therefore, a lower bitrate, a reduced computational complexity, and a decrease in memory access bandwidth can be expected in coding. The human visual system is known to fuse left and right views in such a way that the perceptual visual quality is closer to that of the higher-resolution view. In this paper, a subjective assessment of mixed resolution (MR) stereoscopic videos is presented and the results are analyzed and compared with previous subjective tests presented in the literature. Three downsampling ratios 1/2, 3/8, and 1/4 were used to create lower-resolution views. Hence, the lowerresolution view had different spatial resolutions in terms of pixels per degree (PPD) for each downsampling ratio. It was discovered that the subjective viewing experience tended to follow a logarithmic function of the spatial resolution of the lowerresolution view measured in PPD. A similar behavior was also found from the results of an earlier experiment. Thus, the results suggest that the presented logarithmic function characterizes the expected viewing experience of MR stereoscopic video.

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Section: Preparation Of the Test Stimulimentioning

confidence: 99%

Section: Preparation Of the Test Stimulimentioning

confidence: 99%

“…In [5], the impact of downsampling ratio in MR stereoscopic video was studied. Downsampling ratios 1/2, 3/8, and 1/4 were applied vertically and horizontally.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Estimation of subjective quality for mixed-resolution stereoscopic video

Aflaki

Hannuksela

Hakala

et al. 2011

2011 3DTV Conference: The True Vision - Capture, Transmission and Display of 3D Video (3dtv-Con)

Self Cite

View full text Add to dashboard Cite

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Subjective quality assessment of asymmetric stereoscopic 3D video

Aflaki

Hannuksela

Gabbouj

2013

SIViP

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In asymmetric stereoscopic video compression, the views are coded with different qualities. According to the binocular suppression theory, the perceived quality is closer to that of the higher-fidelity view. Hence, a higher compression ratio is potentially achieved through asymmetric coding. Furthermore, when mixed-resolution coding is applied, the complexity of the coding and decoding is reduced. In this paper, we study whether asymmetric stereoscopic video coding achieves the mentioned claimed benefits. Two sets of systematic subjective quality evaluation experiments are presented in the paper. In the first set of the experiments, we analyze the extent of downsampling for the lower-resolution view in mixed-resolution stereoscopic videos. We show that the lower-resolution view becomes dominant in the subjective quality rating at a certain downsampling ratio, and this is dependent on the sequence, the angular resolution, and the angular width. In the second set of the experiments, we compare symmetric stereoscopic video coding, qualityasymmetric stereoscopic video coding, and mixed-resolution coding subjectively. We show that in many cases, mixedresolution coding achieves a similar subjective quality to that

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