xiX - Technical Manual Version 1.3
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4.3.2.6.
Multiple exposures in one frame
All Sony IMX based xiX models except MX023xG-SY support defined number of exposures exposed in a single frame.
In this mode the number of exposures need to be defined. The number of exposures can be defined using the XiApi parameter
XI_PRM_EXPOSURE_BURST_COUNT. The readout of the frame starts after the last exposure period has finished.
It can operate in two modes:
1. Exposure defined by XiApi parameter "XI_PRM_EXPOSURE"
In this mode the trigger defines the start of the exposure but the length of the exposure is defined by the
XI_PRM_EXPOSURE xiApi parameter. Set exposure length using XI_PRM_EXPOSURE parameter
and set XI_PRM_TRG_SELECTOR to XI_TRG_SEL_EXPOSURE_START.
// Set exposure
xiSetParamInt(xiH, XI_PRM_EXPOSURE, 1000);
// Set the number of times of exposure in one frame
xiSetParamInt(xiH, XI_PRM_EXPOSURE_BURST_COUNT, 5);
// Set trigger selector
xiSetParamInt(xiH, XI_PRM_TRG_SELECTOR, XI_TRG_SEL_EXPOSURE_START);
figure 4-8, Multiple exposures - defined exposure time, number of exposures set to 5
2. Exposure is defined by length of trigger pulse.
In this mode both the start of the exposure as well as the length of the exposure is defined by the trigger pulse. Set
XI_PRM_TRG_SELECTOR to XI_TRG_SEL_EXPOSURE_ACTIVE. The exposure length will be defined by trigger pulse length.
// Set the number of times of exposure in one frame
xiSetParamInt(xiH, XI_PRM_EXPOSURE_BURST_COUNT, 5);
// Set trigger selector
xiSetParamInt(xiH, XI_PRM_TRG_SELECTOR, XI_TRG_SEL_EXPOSURE_ACTIVE);
figure 4-9, Multiple exposures - exposure time defined by trigger pulse length, number of exposures set to 5
In both above modes there is a short period (FOT) after each exposure during which the next exposure cannot start. In case of the
cameras with IMX sensors this period is 11*line period (the line period depends on various other parameters, see Line Period in
the using
