Imaging Parameters; Exposure - Point Grey Gazelle GZL-CL-22C5M-C Technical Reference

Point Grey Gazelle Technical Reference
6

Imaging Parameters

6.1

Exposure

Exposure, or integration, refers to the amount of time the shutter stays open. The shutter is the camera mechanism that
controls exposure to light on the sensor for each frame.
The exposure range is a 24-bit register. The range of values is from 1h - FFFFFFh. For factory default settings, refer to the
Gazelle Specifications
If the exposure time is changed after placing the camera in asynchronous trigger mode, the exposure
time will automatically revert to its previous value after the camera is taken out of trigger mode. For
more information about trigger mode, see
When operating in trigger mode, the minimum allowable exposure value is 5. For more information about trigger
modes, see Asynchronous
Exposure (Shutter)
Name
Exposure Time Raw
Exposure Time Minimum
Exposure Time Maximum
To convert from raw values to seconds, use one of the following formulas, depending on current
mode (either free-running or synchronized exposure), number of taps for output and sensor input clock speed:
40 MHz (default)
( (raw_value * 129) / 40e6 ) + 0.00007095
30 MHz
( (raw_value * 129) / 30e6 ) + 0.0000946
20 MHz
( (raw_value * 129) / 20e6 ) + 0.0001419
10 MHz
( (raw_value * 129) / 10e6 ) + 0.0002838
( (raw_value * 129) / 10e6 ) + 0.0000903
Revised 10/31/2013
Copyright ©2011-2013 Point Grey Research Inc.
tables for each model.
Triggering.
Description
Gets or sets the exposure time
Gets the minimum exposure time
available in the current video mode
Gets the maximum exposure time
available in the current video mode
Free-running mode:
Full 8-tap configuration:
n
Base 2-tap configuration:
n
Asynchronous Triggering.
Read
eraw value
eraw
value is in raw (non-absolute) terms
eraw gmin
eraw gmax
Synchronized Exposure (Trigger) mode:
Full 8-tap configuration:
n
40 MHz (default)
( (2^12 * raw_value ) / 40e6 ) + 0.00007095
30 MHz
( (2^12 * raw_value ) / 30e6 ) + 0.0000946
20 MHz
( (2^12 * raw_value ) / 20e6 ) + 0.0001419
10 MHz
( (2^12 * raw_value ) / 10e6 ) + 0.0002838
Base 2-tap configuration:
n
( (2^12 * raw_value ) / 10e6 ) + 0.0000903
6 Imaging Parameters
Write
Image Acquisition
44