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D:
VIDEO TESTS
Due to the automatic selection of video protocols we were unable to carry out the full
suite of tests.
In all tests at H.323 the corresponding audio standard is Siren™ 14, 48kbit/s
Objective Video Tests: Signal measurements
1. 75% EBU bars
2. Grey scale
Subjective Video Impairments Tested:
Lip synchronisation
Block distortion (tiling)
Blurring (reduced edge sharpness and spatial detail)
Colour errors
Jerkiness (distortion of smooth motion)
Object persistence(lagging images from previous frames as faded or outline images)
Scene cut response (i.e. time to build up the new image)
Scale of impairments:
Imperceptible
Perceptible
Slightly annoying
Annoying
Very annoying
Test Tape:
Signals recorded
EBU colour bars
Grey scale
Blue field
Medium close up female face, still
Medium close up female face, talking
Close up face, nodding
Close up face, shaking head side to side
Zoom out slowly to wide angle three people
Zoom in quickly to close up of centre person
Turntable speeds: 1, 2, 3 and 4
Football sequence
Zoom in and out of 'A-to-Z' map
Text legibility, font sizes 20 to 12 pt
Cut tests, scenes various with camera movements
Man teaching at whiteboard
To ensure accuracy of measurement at the remote site, all signals are to be monitored
prior to transmission.
1
2
3
4
5
Time on tape
1min 30secs
1.40 - 2.40
2.50 - 3.50
4.00 - 5.00
5.10 - 6.10
6.20 - 7.20
7.30 - 8.30
8.40 - 9.40
9.50 - 10.50
11.00 - 15.30
15.40 - 16.40
16.50 - 17.50
20.30 - 20.50
21.00 - 22.00
22.10 - 23.23
LS
BLK
BLR
CLR
JRK
OP
SCR
8
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