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flatfield CalibrationTarget
flatfield CalibrationSam p leSize
flatfield Calibration ROIOffsetX
flatfield Calibration ROIWid th
flatfield CalibrationFPN
flatfield CalibrationPRN U
2. Contrast Enhancement
The offset and gain featu res can be u sed to m axim ize the u se of the ou tp u t d ynam ic range. Typ ical u se is
to su btract the m inim u m p ixel valu e exp ected and then gain u p to the m axim u m p ixel valu e to ap p roach
fu ll scale. This p rocess m ay be u sefu l for ap p lications that p rocess the RGB colors ind ivid u ally.
Offset
1. Single valu e ad d ed to each p ixel
2. Range -32 to +31 DN
3. Positive valu es m ay be u sed to m easu re d ark noise
Gain
1. Floating p oint d igital m u ltip lier ap p lied to each p ixel
2. Range 1x to 10x
N ote: An application note describing a color transformation matrix calibration (document #03-
032-20181) is available. Please contact Teledyne D ALSA Support for more information.
03-032-20180-00
1.
After calibration all p ixels w ill be scaled to ou tp u t this level
Range: 8 bit, 0 to 255 DN
1.
N u m ber of lines to average w hen calibrating
2.
2048 or 4096*
*4080 active p ixels, the last 16 p ixels are inactive.
Together w ith ―flatfield Calibration ROIWid th‖ sp ecifies the
1.
range of p ixels to be calibrated . Pixel coefficients ou tsid e this
range are not changed . It is p ossible to calibrate d ifferent
regions sequ entially.
Save average line (of ―flatfield CalibrationSam p leSize‖ row s).
1.
This is the first u ser correction ap p lied – it is su btracted from
each line.
2.
This featu re m ay not be of u se to m any u sers as the cam era
alread y su btracts tru e ―d ark cu rrent‖, bu t it m ay be u sefu l for
som e to p rovid e a p er p ixel offset correction.
3.
Range 0 to 31 DN , 8 bit
4.
Defau lt valu e is 0 DN for each p ixel
Use ―flatfield CorrectionAlgorithm ‖ to calcu late the p er p ixel
1.
gain to achieve the sp ecified target ou tp u t.
2.
Max 15.9998x
3.
Defau lt 1x
Piranha4 4K Camera Color User's Manual
Teledyne DALSA
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