Appendix 2 Detailed Video Tests
The HDX system supports, H.261, H.263, H.263+ and H.264, but these protocols
are automatically selected. In calls between HDX units only the default protocol
H.264 could be tested as this was the one negotiated by the CODECs
For the following tests using the DVI input and with the PC input set to People and
Sharpness, the video resolution between HDX systems was 4SIF at 384Kbit/s rising
to 720p at all other connection speeds
Objective Video Tests: Signal measurements
1. 75% EBU bars
2. Grey scale
Subjective Video Impairments Tested:
Block distortion (tiling)
Blurring (reduced edge sharpness and spatial detail)
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 1
Perceptible 2
Slightly annoying 3
Annoying 4
Very annoying 5
MII Test Tape:
Signals recorded Time on tape
1. EBU colour bars 1min 30secs
2. Grey scale 1.40 - 2.40
3. Blue field 2.50 - 3.50
4. Medium close up female face, still 4.00 - 5.00
5. Medium close up female face, talking 5.10 - 6.10
6. Close up face, nodding 6.20 - 7.20
7. Close up face, shaking head side to side 7.30 - 8.30
8. Zoom out slowly to wide angle three people 8.40 - 9.40
9. Zoom in quickly to close up of centre person 9.50 - 10.50
10.Turntable speeds: 1,2,3 and 4 11.00 - 15.30
11.Football sequence 15.40 - 16.40
12.Zoom in and out of ―A to Z‖ map 16.50 - 17.50
13.Text legibility, font sizes 20 to 12 pt 20.30 - 20.50
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