Quality Assessment - 3DTV: Processing and Transmission of 3D Video Signals - page 187

3D reproduction quality can be expressed more in terms of lack of error
rather than quality measurements. Various 3D display technologies lack 3D
reproduction from certain angles, or certain aspects of 3D vision altogether,
such as horizontal and/or vertical motion parallax, depth perception from
the whole field of view (FOV), or acceptable 3D view distance. Correctness
of 3D image reproduced by the display is also an important factor. Some
displays show 3D images that are not physically consistent (e.g. the images
have bad perspectives) since they flatten the image to keep it inside the
visible depth range.
6.4.6 3D-SpecificTechnicalProperties thatAffect
theViewingExperience
6.4.6.1 View Uniformity
The uniformity of multi-channel systems largely depends on any variation
in brightness, contrast and colour balance between the neighbouring views
of the display.
6.4.6.2 Total Field of View (FOV)
Auto-stereoscopic 3D displays provide areas of different size from which the
image can be perceived. Typical values range from 10 to 60 degrees total
field of view, depending on the definition (i.e. where the viewer stands with
respect to the centre of the screen). This measure does not apply to wearable
visual aids (such as shutter glasses, polarized glasses, etc.) displays, as the
viewer can see the same image regardless of his/her position. Whether the
viewer can see a correct 3D image from everywhere inside this range or
just a specific sweet spot also affects the quality of experience. FOV can be
measured by finding the range from which the full 3D image can still be
correctly seen on both sides.
6.4.6.3 Angular Resolution and Field of Depth (FOD)
In the case of 3D displays, there is an additional measure of resolution to
take into account (on top of the usual horizontal and vertical). The number of
independent beams emitted inside the FOV determine the angular resolution
of the display. This property shows us the 'jumpiness' of the 3D display.
Moreover, this same value directly relates to the Field of Depth, which
is the range of depth that the display is able to show without excessive
blurring. Angular resolution can be measured with a specialized measuring
device such as an Eldim VCMaster3D. Typical Field of View for 3D display
technologies is shown in Figure 6.19.
6.4.6.4 Cross-Talk
Cross-talk defines how much a neighbouring view affects the currently
measured view. Any cross-talk between views is measured by illuminating