Dalsa Dalsa DS-4x-06M18, User'S Manual And Reference

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6M18 Camera User’s Manual 28
DALSA 03-32-10017-03
Whenever the camera is in binning mode, the BIN LED on the right side of the rear cover will
light to indicate other than 1x1 binning.
Lines per image
Vertical binning affects the number of lines per image. The following table summarizes the total
number of lines per frame versus the total number of usable lines per frame as a function of the
vertical binning mode.
Table 17: Lines per Frame Versus Vertical Binning
Vertical binning 1x 2x 4x
Total lines per frame 1030 515 258
Usable image lines per frame 1024 512 256
The difference between the total number of lines and the uesable image lines is a result of 6
masked (dark) lines at the top of each channel the CCD array. These lines must be read out to
completely clear the CCD for the next integration. In all cases the first lines read out are the valid
image lines and the remainder are invalid.
3.11 Flush Before Integrate
There is no way to prevent the CCD imager from integrating (accumulating charge due to light
falling on the imager). Under some conditions this will cause the image to show smearing in the
vertical direction unless something is done to prevent this. In order to prevent this, by default, the
camera flushes the image area clean by performing a rapid transfer of the charge out of the
imaging area of the CCD immediately before the start of each integration period. This transfer
requires approximately 1.2 mS of time.
Under some conditions, this 1.2 mS time delay before the start of the integration period is
undesirable. An example would be when the user desires to synchronize the integration to an
external event. This mode is only functional when in External Integration mode. In external
Integration Modes, the user can disable the Flush Before Integrate Mode by setting bit 2 in
Register 1 = 1.
3.12 Triggering, Integration, and Frame Rate
Overview
Image capture triggering, integration, and frame rate are closely related.
• You can program fixed integration and frame rates (or use defaults) and let the camera “free
run.”
• You can program fixed integration time and supply a (asynchronous) trigger signal to control
frame rate by supplying a TTL pulse on the SMA connector. This is referred to as
“Programmed Integration/External Trigger Mode.”
• You can also have the camera integrate as long as an asynchronous TTL pulse is held high.
This pulse will therefore control both integration time and frame rate. This is also known as
“External Integrate Mode.”