RMV Operations Manual Revision Copyright illunis LLC, 2014
Page 62
4.4: Exposure:
Partial Scan
Partial Scan
mode is used to read a selected
number of rows from the CCD. Using the fast dump gate
feature of the Truesence Interline Transfer sensors the
PS mode dumps or purges the lines before the start line.
Then the lines between the start line and the stop line are
read out. Finally the lines after the stop line are purged.
Partial scan can be used to increase the frame rate by
only reading the lines of interest to an application. There
are separate PS enables for free run and trigger modes.
Serial Commands
Target
Index
Command
R/W
Description
04
04
Mode Register
W
0xM003 = Enable Partial Scan
04
04
Mode Register
W
0xM004 = Disable Partial Scan
M = 0: Common—both, M = 8: Free Run only, M = 4: Trigger only
04
0A
PS Start Line
R/W
Sensor Dependent
04
0B
PS Stop Line
R/W
Sensor Dependent. (> Start Line)
Quick FAQ’s:
►5p5 um CCDs do not have a fast dump gate.
►PS purges unwanted lines of video data.
►The stop line must be greater than the start line.
►PS of 1/2 the lines of the sensor does not result in
2X the frame rate bacause the purged lines require
some time for the purge.
►
CCD’s have non-visable lines that can be selected
for purging in the PS mode.
Start Line
Stop Line
Partial Scan line selection are readout area
Readout lines
Purged lines
Purged lines
Readout lines
Readout lines
Line 4
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