Report itu-r bt. 2293-0 (11/2013)



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1 Summary and proposals


This annex presents the results of visual discomfort induced by motion characteristics and depth magnitude in stereoscopic 3D content. Based on subjective measurements, the following aspects have been observed:

– fast spatial and temporal changes of disparity in stereoscopic 3D content should be avoided. The fast change of binocular disparity may induce visual discomfort accompanied by symptoms such as focusing difficulty and eyestrain;

to prevent visual discomfort, excessive disparity of stereoscopic 3D content should be avoided. Excessive binocular disparity may induce visual discomfort accompanied by symptoms such as focusing difficulty and eye strain.

These observations should be referred when developing viewing safety guidelines of stereoscopic 3D systems.


2 Experimental environments


The apparatus used for the experiments was a half mirror type stereoscopic 3D monitor (Redrover SDM-400®, linear polarized 3D display). It consisted of two 40-inch LCD displays with a refresh rate of 60 Hz and a half mirror. The spatial resolution of the monitor was set to 1 920 × 1 080 pixels. The crosstalk levels of the stereoscopic 3D monitor were 0.75% and 0.27% for the left and right eye, respectively, which were lower values than the visibility threshold [1], [2]. The viewing distance between the subject and the 3D display was fixed to three times the picture height (i.e. 1.5 metres). All experimental environments followed Recommendations ITU-R BT.500-11 [3] and ITU-R BT.1438 [4].

Table 11 is a summary of the experimental environment.



Figure 19

Stereoscopic 3D monitor used in our subjective assessments

TABLE 11


Experimental conditions

Room illumination

3.45 lux

Ratio of luminance of inactive screen to peak luminance

0.003

Brightness

500 cd/m2 (112 lux)

Height of display (H)

498 mm

Viewing distance

1 500 mm



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