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Test 12a (H.263): Zoom in and zoom out of ‘A-to-Z’ map
Subjective Impairments H.323 768kbit/s
BLK 2
BLR 3
CLR 1
JRK 2
Test 12b (H.264): Zoom in and zoom out of ‘A-to-Z’ map
Subjective Impairments H.323 384kbit/s
BLK 3
BLR 3
CLR 1
JRK 3
Test 13a (H.263): Text legibility (% of screen height) at viewing distance approx. 5 x
screen diagonal
Legibility H.323 768kbit/s
20 pt (3.5%) Yes
16 pt (3%) Yes
14 pt (2.5%) No
12 pt (2.3%) No
Test 13b (H.264): Text legibility (% of screen height) at viewing distance approx. 5 x
screen diagonal
Legibility H.323 384kbit/s
20 pt (3.5%) Yes
16 pt (3%) Yes
14 pt (2.5%) No
12 pt (2.3%) No
Test 14a (H.263): Video with several vision cuts
Subjective Impairments H.323 768kbit/s
BLK 2
BLR 2
CLR 1
OP 1
SCR 2
JRK 1