Extended shutter – ALLIED Vision Technologies Marlin F-201 User Manual
Page 122
Controlling image capture
MARLIN Technical Manual V2.4.0
122
The minimum adjustable exposure time set by register is 20 µs.
The real
minimum exposure time of a Marlin F-033 is then:
20 µs + 12 µs = 32 µs
Extended shutter
The exposure time for long-term integration of up to 67 seconds can be
extended via the advanced register: EXTENDED_SHUTTER
The longest exposure time, 3FFFFFFh, corresponds to 67.11 sec.
The lowest possible value of ExpTime is camera-specific (see
era-specific minimum exposure time
Register
Name
Field
Bit
Description
0xF100020C
EXTD_SHUTTER
Presence_Inq
[0]
Indicates presence of this feature (read
only)
---
[1.. 5]
Reserved
ExpTime
[6..31]
Exposure time in µs
Table 46: Advanced register: extended shutter
Note
L
•
Exposure times entered via the 81Ch register are mir-
rored in the extended register, but not vice versa.
•
Longer integration times not only increase sensitivity,
but may also increase some unwanted effects such as
noise and pixel-to-pixel non-uniformity. Depending on
the application, these effects may limit the longest
usable integration time.
•
Changes in this register have immediate effect, even
when the camera is transmitting.
•
Extended shutter becomes inactive after writing to a
format/mode/frame rate register.