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Test 12 (H.263): Zoom in and zoom out of ‘A to Z’ map
Subjective Impairments H.323
384 Kbps 768 Kbps
BLK 5 5
BLR 5 5
CLR 1 1
JRK 5 5
Test 13 (H.263): Text legibility (% of screen height) at viewing distance approx. 5x
screen diagonal
Legibility H.323
384 Kbps 768 Kbps
20 pt (3.5%) Yes Yes
16 pt (3%) Yes Yes
14 pt (2.5%) No No
12 pt (2.3%) No No
Test 14 (H.263): Video with several vision cuts
Subjective Impairments H.323
384 Kbps 768 Kbps
BLK 4 4
BLR 4 3
CLR 1 1
OP 1 1
SCR 3 3
JRK 5 4
Test 15 (H.263): Man teaching with flip chart
Subjective Impairments H.323
384 Kbps 768 Kbps
LS 3 3
BLK 4 3
BLR 3 2
CLR 1 1
JRK 2 2
Test 16: Playback from a domestic VHS videotape player
Is picture stable? Yes