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 |
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| LS |
Block distortion (tiling) |
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| BLK | |
Blurring (reduced edge sharpness and spatial detail) |
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| BLR | |
Colour errors |
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| CLR |
Jerkiness (distortion of smooth motion) |
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| JRK | |
Object persistence(lagging images from previous frames as faded or outline images) | OP | |||
Scene cut response (i.e. time to build up the new image) |
| SCR | ||
Scale of impairments: |
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Imperceptible | 1 |
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Perceptible | 2 |
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Slightly annoying | 3 |
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Annoying | 4 |
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Very annoying | 5 |
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Test Tape: |
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Signals recorded |
| Time on tape |
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EBU colour bars |
| 1min 30secs |
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Grey scale |
| 1.40 | - 2.40 |
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Blue field |
| 2.50 | - 3.50 |
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Medium close up female face, still | 4.00 | - 5.00 |
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Medium close up female face, talking | 5.10 | - 6.10 |
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Close up face, nodding | 6.20 | - 7.20 |
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Close up face, shaking head side to side | 7.30 | - 8.30 |
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Zoom out slowly to wide angle three people | 8.40 | - 9.40 |
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Zoom in quickly to close up of centre person | 9.50 | - 10.50 |
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Turntable speeds: 1, 2, 3 and 4 | 11.00 | - 15.30 |
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Football sequence |
| 15.40 | - 16.40 |
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Zoom in and out of | 16.50 | - 17.50 |
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Text legibility, font sizes 20 to 12 pt | 20.30 | - 20.50 |
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Cut tests, scenes various with camera movements | 21.00 | - 22.00 |
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Man teaching at whiteboard | 22.10 | - 23.23 |
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To ensure accuracy of measurement at the remote site, all signals are to be monitored prior to transmission.
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