Quality Assessment - 3DTV: Processing and Transmission of 3D Video Signals - page 185

defined as follows:

nZMA 0.2393 )

3 D _ Quality = (1 − 0.997 · · (1 − VQM color )

nZMA 0.2393 ) + (0.997 · · [(1 − VQM color ) · MDDM depth _ map ] (6.36)

Subjective tests are conducted for the quality variations considered in test 3,
for 'Ballet', 'Inition 2D-3D World Cup', 'Butterfly', 'Watermill' and 'Interior'
to assess the performance of the proposed compound 3D quality model.
These 3D sequences contain different motion characteristics and different
spatial and temporal resolutions (see Appendix A). Subjects are asked to
rate the overall 3D quality using the SSCQS method. Currently, the average
PSNR of rendered left and right video is widely used as a measure of overall
3D video quality. Average quality rating of rendered left and right video
using PSNR and other recently developed perceptual models like SSIM and
VQM are used for a more general performance comparison of the proposed
model. The relationship between the MOS for overall 3D video quality
and the assessment models are approximated by the symmetrical logistic
function (6.3). The Performance comparison metrics (CC, SSE, RMSE) for each
prediction model, approximated using the symmetrical logistic function, are
evaluated for the above test sequences and the results are presented in
Table 6.6.
The results clearly imply that the proposed compound 3D quality model
has better values for the performance comparison metrics in predicting
the overall 3D quality of colour-plus-depth-based 3D video. Therefore, the
proposed model can be effectively used in predicting the perceptual quality
of colour-plus-depth-based 3D video.

6.4.4 Applicationof theProposedQualityModels
With the continued global growth of broadcast technologies, real-time 3D
video services can be now realized. Delivery of 3DTV, movies, media,

Table 6.6 Performance comparison metrics for each prediction model

Objective quality model Overall 3D video quality

CC RMSE SSE

Average PSNR of the Rendered 0.7061 0.1363 0.1091

Left and Right views
Average SSIM of the Rendered

0.7387 0.0949 0.0887

Left and Right views
Average VQM of the Rendered 0.8092 0.057 0.0501

Left and Right views
Proposed Compound 0.8461 0.0337 0.0319

3D Quality Model