Piranha Color Camera User’s Manual 45
DALSA 03-032-10211-01 5/9/2007
Related Commands:
ccp, wfc
Example:
ccf
Setting a Pixel’s FPN Coefficient
Purpose: Sets an individual pixel’s FPN coefficient.
Syntax
sfc x i
Syntax Elements:
x
The pixel number from 1 to sensor pixel count.
i
Coefficient value in a range from 0 to 4095 (12 bit LSB).
Notes: Before sending this command, use the scl command to select the
color you want to adjust.
Example:
sfc 10 50
Setting a Range of FPN Coefficients
Purpose: Sets a range of pixel FPN coefficients.
Syntax
sfr x x i
Syntax Elements:
x
The first pixel number of the range.
x
The last pixel number of the range.
i
Coefficient value in a range from 0-2048.
Notes:
• Before sending this command, use the
scl command to
select the color you want to adjust.
The first pixel of the range must be less than the last.
Example:
sfr 1 100 80
PRNU Calculation
Performing PRNU to a user entered value
Purpose: Calculate the PRNU coefficients to eliminate the difference in
responsivity between the pixels, thereby creating a uniform response
to light. Using this command, you must provide a calibration target.
Syntax:
cpa i1 i2
Syntax Elements:
i1
PRNU calibration algorithm to use:
1 = This algorithm first adjusts each tap’s analog gain so that
8-13% of pixels within a tap are above the value specified in
the target value parameter. PRNU calibration then occurs using
the peak pixel in the region of interest.
This algorithm is recommended for use only when FPN is
negligible and FPN coefficients are set to zero. Since this
algorithm adjusts the analog gain, it also affects FPN. If FPN is
calibrated prior to running this algorithm, FPN will be
observable in dark conditions and an incorrect FPN value will
be used during PRNU calibration resulting in incorrect PRNU
coefficients.
2 = Calculates the PRNU coefficients using the entered target
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