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Figure 1: Rolling shutter
In rolling shutter mode, a doubling of the exposure time clearly leads to a doubling of the gray value:
ExposureTime2
GrayValueFactor = -------------
ExposureTime1
Note
Moving objects together with a rolling shutter can cause a shear in moving objects.
The global reset release shutter, which is only available in triggered operation, starts the exposure of all rows
simultaneously and the reset to each row is released simultaneously, too. However, the readout of the lines is equal
to the readout of the rolling shutter: line by line:
Figure 2: Global reset reslease shutter
Note
The max. exposure time of the global reset release mode is 206ms.
Any triggered operation (like software trigger) leads inevitably to the global reset mode (even if the shutter mode
property is still set to "mvRollingShutter").
Note
This means, the bottom lines of the sensor will be exposured longer! For this reason, this mode will only make
sense, if there is no ambient light and the flash duration is shorter or equal to the exposure time.
Thus, the gray value factor of the first line, which is similar to the one of the rolling shutter, is different to the factor
of the last line:
ExposureTime2 + FrameTime
GreyValueFactor (last line) = -------------------------
ExposureTime1 + FrameTime
MATRIX VISION GmbH
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