Other Considerations
The other dominant factors which may influence whether the line structures or the increased resolutions can actually be seen are :
- “Kel factor” associated with interlace scans. (works to decrease the observed resolution both vertically and horizontally by 0.7 to 0.8)
- Interlace artefacts such as “pairing” in displays (H to V xtalk)
- Room lighting conditions.
- Programme material type.
- Programme production and coding artefacts
- Display structures - dot, line, rectangular, black matrix, tube, plasma etc.
- Display dynamics, persistence, dynamic focus, and shading correction.
- Viewing distance - this analysis is based on 6H for SDTV and 4H for HDTV.
- Variability of the human observer from the typical normal vision for a young observer.