SIGMA LBA-708 - Manual (Page 125)

operates in a binning mode compatible with the LBA application then we will often supply
multiple camera configuration files, one for each bin format. Camera binning can occur in two
different styles.
When the pixels are binned equally in both the horizontal and vertical direction, the resulting
image maintains its aspect ratio and is best for operating in the LBA-PC application. This type of
binning is labeled, 2x2, 3x3, 4x4, etc… Camera files for this type of configuration will usually say
“BIN2X2” or “BIN4x4” somewhere in the file name. You must chose the configuration file that
matches your camera binning or you will not be able to acquire a correct image.
When the pixels are binned unequally in the horizontal and vertical directions the resulting image
will appear to have a distorted aspect ratio. We do not recommend operation of the LBA-PC
under these conditions and so no camera files are provided to support this type of camera
setting.
5.4.1.2 Digital Camera ROI Formating
Some digital cameras have a feature that allows then to readout only a defined Region Of
Interest (ROI) of the focal plane array. This will reduce the data and increase the frame rate of
the cameras operation. While this feature can be used with the LBA application, it is not an easy
adjustment to make. If you must have a camera configuration designed to operate with some
ROI requirement then you must make appropriate changes in the Advanced… Special Camera
Settings dialog box. We recommend that you contact the Spiricon service department for
assistance in making these changes.
5.4.1.3 Digital Camera Exposure Controls
Many digital cameras have user programmable exposure controls. These can range from very
short integration times (microseconds) to very long integration times of many seconds. The
exact nature and operation of these features can vary dramatically from one camera
manufacturer to another. In general most of these capabilities are fully compatible with the LBA
application without special considerations. Our suggestion is to try it and see how it works. With
very long integration times some cameras will stop outputting frame syncs to the frame grabber.
When this occurs the Video sync enunciator may turn RED. Under this condition this signal can
be ignored.
Warning: Some cameras do not maintain good linearity of response when very short integration times are used. If
you suspect this type of distortion then you should run a response test to determine if the problem lies with the
camera. The only solution to this is to either avoid the short exposure times or employ gamma correction to try and
compensate for the errors.
Besides programmable exposure control some cameras can have their exposure times controlled
by externally applied digital signals. Some of these camera are compatible with Spiricon’s
Integration control feature discussed in section 5.3.
5.4.1.4 Digital Camera Triggering
Digital cameras can have a number of external triggering capabilities. Most of these have been
found to be compatible with the LBA application. We suggest you test these features to
determine if they achieve the desired results. If you are triggering a camera with a period longer
than a frame time then some cameras will stop outputting frame syncs to the frame grabber. If
Operator’s Manual LBA-PC
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