JAI AT-030MCL User Manual page 15

 How to calculate total line number and frame rate in variable partial scan mode
Frame rate (fps) = Horizontal frequency(61571Hz) / Total lines
Total lines = Blanking period + Fast Dump period in the upper part of the frame (L) +
Effective image period (L) + Fast dump period in the lower part of frame (L)
Where,
Blanking period = 4L (Fixed)
Fast dump period for the upper part =
Effective image period = Height
Fast dump period for the lower part =
Calculation example
Read out: 1/2 partial at the center , Height(246), Offset(123)
Blanking period =4L
Fast dump period for the upper part = (123 + 9) ÷6 +2=24
Effective image period = 246
Fast dump period for the lower part = (494-(123+246) + 2) ÷ 6 =21.1  22
Total lines = 4+24+246+22=296
Frame rate = 61571/296 =208.1 fps
AT-030MCL
Fig.11. Variable Partial scan
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