Graphics Reference
In-Depth Information
The H.264/AVC and scalable H.264/AVC configurations outperform the MPEG-4 MAC
configuration by a considerable margin for depth image quality at all overall bitrates (see
Figure 3.16 (b) and 3.17 (b)). The fewer number of objects and unavailability of high
frequency components help to achieve superior depth map quality for H.264/AVC based
configurations. These smooth depth images can be highly compressed using flexible MB
sizes and skipped MB modes available in H.264/AVC
[110]
compared to other MPEG
video coding standards. The gain is more visible in the Interview sequence, which has less
motion and stationary background.
The subjective image qualities of the Orbi colour and depth map sequences are illustrated in
Figures
3.18 and 3.19 respectively. The image sequences are obtained at an overall bitrate of 150
Kbits/s, utilizing the coding configurations based on scalable H.264/AVC and MPEG-4
MAC.AccordingtoFigure3.18,subjectivequalityoftheSVCcodedcolourimageisbetter
compared to that of the MPEG-4 MAC coded colour image. This is more visible in the
depth image sequences as shown in Figure 3.19. The scalable H.264/AVC coded depth
image demonstrates a sharp and better image quality compared to that of the MPEG-4
MAC coded depth image sequence at the given low bitrate of 150 Kbits/s
(a)
(b)
