This is the help for FoCal 5 and the FoCal Mobile 3.0 apps. For FoCal 6, see the current help.

Test / Utility Information

Absolute H/V Ratio – Stabilisation Test

FoCal 5

(See Chart Features for general chart features - changing scales, copying to clipboard etc)

The Absolute H/V Ratio chart shows a comparison between the horizontal and vertical analysis quality but ignores which axis is better quality.

Key:

  • Green line: smoothed H/V Ratio with stabilisation enabled.
  • Red line: smoothed H/V Ratio with stabilisation disabled.
  • Green points/dotted line: raw H/V Ratio with stabilisation enabled.
  • Red points/dotted line: raw H/V Ratio with stabilisation disabled.

Interpretation

Where H/V Ratio (H/V Ratio – Stabilisation Test) shows which axis is sharper, the Absolute H/V Ratio simply shows the magnitude of the difference between the horizontal and vertical analysis, which can give a clearer indication of general quality degradation.

The value is always positive. A higher value indicates a bigger difference in quality that’s measured rotated by 90 degrees.

The important thing in the chart above is the step change in difference when stabilisation is enabled, starting around 1/15s. This indicates that the quality is impaired – even with stabilisation enabled – by around 1/8s.