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 ÷ (1830 ×17.24138 × 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
