Table of Contents
Advertisement
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:
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
MII Test Tape:
Signals recorded
1. EBU colour bars
2. Grey scale
3. Blue field
4. Medium close up female face, still
5. Medium close up female face, talking
6. Close up face, nodding
7. Close up face, shaking head side to side
8. Zoom out slowly to wide angle three people
9. Zoom in quickly to close up of centre person
10.Turntable speeds: 1,2,3 and 4
11.Football sequence
12.Zoom in and out of ―A to Z‖ map
13.Text legibility, font sizes 20 to 12 pt
1
2
3
4
5
15
LS
BLK
BLR
CLR
JRK
OP
SCR
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
Advertisement
Table of Contents
