  The 3D video quality metric (3VQM) was proposed to evaluate the temporal and
spatial variation of the depth errors for the depth values that would lead to
inconsistencies between left and right views, fast changing disparities, and
geometric distortions. Previously, we evaluated 3VQM against subjective scores.
In this paper, we show the effectiveness of 3VQM in capturing errors and
inconsistencies that exist in the rendered depth-based 3D videos. We further
investigate how 3VQM could measure excessive disparities, fast changing
disparities, geometric distortions, temporal flickering and/or spatial noise in
the form of depth cues inconsistency. Results show that 3VQM best captures the
depth inconsistencies based on errors in the reference views. However, the
metric is not sensitive to depth map mild errors such as those resulting from
blur. We also performed a subjective quality test and showed that 3VQM performs
better than PSNR, weighted PSNR and SSIM in terms of accuracy, coherency and
consistency.
