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8.4.3 Partial Scan Vertical Timing
The following chart shows the vertical timing of partial scanning in the continuous mode. The
horizontal timing for partial scan is the same as full scan. This is common for Channel 1 (visible,
color) and Channel 2 (near-IR)
If JAI Partial Scan = True,
1L : 1LVAL period
OB: Optical Black
1L = 1660 clock (32.344
μ
s)
Fig.29 Vertical Timing for partial scan
How to calculate total line number and frame rate on variable partial scan mode
Partial scan Offset Y
0 line to 958 line
Height
8 lines to 966 lines
Total lines =
①
+
②
+
③
+
④
+
⑤
+
⑥
Where,
①
OB period in the upper part of the frame= 4L
②
Fast dump period for the upper part=
Round up
{(4+(Offset) - 1)/5}
③
Read out lines = G
G=1, if Height is odd, G=0, if Height is even.
④
Fast dump period for the lower part=
Round up
{((966 –(OffsetY)- (Height) +2))/5)
⑤
Even adjustment for total line=
⑤
=1, If
①
+
②
+
③
+
④
+
⑥
is odd and
⑤
=0, if
①
+
②
+
③
+
④
+
⑥
is even.
⑥
Dummy transfer period = 5L
Frame rate (fps) = Horizontal Frequency / Total lines
where, Horizontal Frequency 30.918KHz
