1.18 Use Cases 141
1.18.5.1.3.1 Notes about the usage of the HDR mode with mvBlueFOX-x00w
• In the HDR mode, the basic amplification is reduced by approx. 0.7, to utilize a huge, dynamic area of the
sensor.
• If the manual gain is raised, this effect will be reversed.
• Exposure times, which are too low, make no sense. During the third phase, if the exposure time reaches a
possible minimum (one line period), a sensible lower limit is reached.
1.18.5.1.3.2 Possible settings using mvBlueFOX-x00w
Possible settings of the mvBlueFOX-x00w in HDR mode are:
"HDREnable":
• "Off": Standard mode
• "On": HDR mode on, reduced amplification:
• "HDRMode":
– "Fixed": Fixed setting with 2 Knee Points. modulation Phase 0 .. 33% / 1 .. 66% / 2 .. 100%
– "Fixed0": Phase 1 exposure 12.5% , Phase 2 31.25% of total exposure
– "Fixed1": Phase 1 exposure 6.25% , Phase 2 1.56% of total exposure
– "Fixed2": Phase 1 exposure 3.12% , Phase 2 0.78% of total exposure
– "Fixed3": Phase 1 exposure 1.56% , Phase 2 0.39% of total exposure
– "Fixed4": Phase 1 exposure 0.78% , Phase 2 0.195% of total exposure
– "Fixed5": Phase 1 exposure 0.39% , Phase 2 0.049% of total exposure
• "User": Variable setting of the Knee Point (1..2), threshold and exposure time proportion
– "HDRKneePointCount": Number of Knee Points (1..2)
– "HDRKneePoints"
*
"HDRKneePoint-0"
· "HDRExposure_ppm": Proportion of Phase 0 compared to total exposure in parts per million
(ppm)
· "HDRControlVoltage_mV": Control voltage for exposure threshold of first Knee Point
(3030mV is equivalent to approx. 33%)
*
"HDRKneePoint-1"
· "HDRExposure_ppm": Proportion of Phase 1 compared to total exposure in parts per million
(ppm)
· "HDRControlVoltage_mV": Control voltage for exposure threshold of first Knee Point
(2630mV is equivalent to approx. 66%)
1.18.5.2 Adjusting sensor of camera models -x02d (-1012d)
1.18.5.2.1 Introduction
The HDR (High Dynamic Range) mode of the Aptina sensor increases the usable contrast range. This is achieved
by dividing the integration time in three phases. The exposure time proportion of the three phases can be set
independently.
MATRIX VISION GmbH
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