Dalsa Piranha ES-80-08k40-00-R User Manual page 55

Piranha ES-xx User Manual
Calibrating Camera Gain
Purpose:
Syntax:
Syntax Elem ents:
N otes:
Exam ple:
The follow ing d iagram s su m m arize and provid e an exam ple of how analog gain is
calibrated w hen u sing a region of interest.
In the follow ing exam ple, analog gain is being set for a tap insid e the region of interest.
The peak valu e of the tap is calibrated to the specified target valu e and all other taps
rem ain u nchanged .
Teledyne DALSA
Instead of m anually setting the analog gain to a specific value, the
cam era can d eterm ine appropriate gain values. This com m and
calculates and sets the analog gain accord ing to the algorithm
d eterm ined by the first param eter.
ccg i t i
i
Calibration algorithm to use.
1 = This algorithm ad justs analog gain so that 8% to 13% of
tap ROI pixels are above the specified target value.
2 = This algorithm ad justs analog gain so that the average
pixel value in tap's ROI is equal to the specified target value.
3 = This algorithm ad justs d igital gain so that the average
pixel value in tap's ROI is equal to the specified target.
4 = This algorithm ad justs the analog gain so that the peak
tap ROI pixels are ad justed to the specified target.
t
Tap value. Use 0 for all taps or 1 to num ber of CCD taps for
ind ivid ual tap selection.
i
Calculation target value in a range from 1024 to 4055DN
(12 bit LSB).

All d igital settings (d igital offset, FPN and PRN U
coefficients), d igital gain, background subtract) should be
turned off before calibrating analog gain to avoid
unpred ictable results.

This function requires constant light input w hile executing.

To use this com m and , the CCD shift d irection (scd) should
be set to forw ard (0) or reverse (1).

If very few tap pixels are w ithin the ROI, gain calculation
m ay not be optim al.

When all taps are selected , taps outsid e of the ROI are set to
the average gain of the taps that are w ithin the ROI.

Perform analog gain algorithm s before perform ing FPN and
PRN U calibration.
ccg 2 0 3040
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03-032-20070-02