Sigma LBA-500PC, LBA-710, LBA-714PC Digital Camera ROI Formating, Digital Camera Exposure Controls

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.

5.4.1.2Digital 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.

5.4.1.3Digital 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.

5.4.1.4Digital 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	125	LBA-PC
Doc. No. 10654-001, Rev 4.10