CAMERAS FRAME GRABBERS IMAGING SOLUTIONS
BOBCAT Hardware User’s Manual
IMPERX
Rev. 2.0.9
6421 Congress Ave.
4/8/2014
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www.imperx.com
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program the camera integration (frame time) from the nominal camera frame time to
16 sec (~ 0.0625 fps) with a precision of 1.0 us.
Frame rate [fps] = 1 / frame time [sec] (2.2)
VCCD
Programmable Integration Time
Standard Frame Time
Figure 2.13 – Programmable frame time
CAUTION NOTE
1.
The maximum frame rate (and minimum frame time) is determined by the
camera mode of operation. If the user enters a higher frame rate than the allowed
one, the image will halt. Programmable Frame Time cannot be enabled in
Trigger mode.
2.
When programmable line time and programmable frame time are to be enabled
simultaneously, enable line time first, set the appropriate line value, and then
enable the programmable frame time. If you change the line time value while the
frame time is enabled, please note that you might need to re-adjust the frame
time value.
3.
If the frame time is greater than 500ms the camera has to be kept still otherwise a
motion smear will appear on the image.
2.5.4 Automatic Exposure Control (AEC)
The camera can be set to automatic exposure (and gain) control in order to keep the
same image brightness during changing light conditions. Both modes – automatic
exposure and automatic gain can be enabled simultaneously. In this mode the user
sets the image brightness (luminance) to be maintained, and the camera adjusts the
exposure accordingly. The user can select the average or peak brightness to be
maintained. The camera starts with changing the exposure within the preset by the
user min-max limits. If one of the exposure limits has been reached, the camera
indicates the limit has been reached and keeps the value until the light condition
change. The speed of convergence (how fast the camera stabilizes after change), can
be preset by the user (four possible options are available). The AEC algorithm
samples all pixels for the entire frame, but the user can select only a portion of the
image (AOI) to be used as a sample collecting region. The camera displays the