JAI CB-141MCL - Manual (Page 18)

CM-141MCL/PMCL/-RA / CB-141MCL/PMCL/-RA
15
Fig.14. variable partial scan
 How to calculate total line number and frame rate in variable partial scan mode
Variable partial scan The start line setting 1st line to 1024nd line
Read out height 8 lines to 1032 lines
Total lines = OB period in the upper part of the frame (L) + 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, OB period in the upper part of the frame 3L
Fast dump period for the upper part
5
7 .

o StartlineN
Roundup
+2
Fast dump period for the lower part
5
. 1039 EndLineNo
Roundup

+2
Frame rate (fps) = 1000000 / (Horizontal pixel No x Pixel clock x Total lines)
Horizontal Pixel number 1830
Pixel clock 17.24138 ns
Calculation example
Read out: 1/2 partial at the center (520L), Stat line (261), End line (780)
OB period in the upper part of the frame 3L
Fast dump period for the upper part = (261+7) ÷ 5 +2 = 55.6 → 56
Fast dump period for the lower part = (1039-780) ÷ 5 +2 ＝53.8 → 54
Total lines = 3＋56＋520＋54＝633
Frame rate = 1000000 ч (1830 Ч17.24138 Ч 633) = 50.06 fps
Image Height
Image start
line/end line
Minimum: 8 lines Maximum: 1032 lines
Image start at 1st line
Image start line from 1 to 1024
Image end line from 8 to 1032
1/8
1024/
8 lines
1032 lines
1032