Piranha HN RoHS User Manual
Teledyne DALSA
03-032-20135-00
43
Performing FPN Correction
Syntax:
Performs FPN correction and eliminates FPN noise by subtracting away individual
pixel dark current. For a complete description on how to use this command, see the
Flat
Field Correction Overview
.
Syntax:
ccf
Notes:
•
Before performing this command, stop all light from entering the camera. (Tip:
cover lens with a lens cap.)
•
Perform FPN correction before PRNU correction.
•
The
ccf
command is not available when the CCD direction is externally
controlled (
scd 2
) (see
Direction Control
). Direction control must be stable while
the camera is calculating coefficients.
•
Available in TDI Mode only.
•
Save coefficients before changing directions, changing operating mode, or
powering off.
Related Commands:
cpa
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 0-511 (12-bit LSB).
Notes:
•
Available in TDI Mode only.
Example:
sfc 10 50
Returning FPN Coefficients
Purpose:
Returns a pixel’s FPN coefficient value in DN (12-bit LSB)
Syntax:
gfc i
Syntax Elements:
i
The pixel number to read in a range from 1 to sensor pixel count.
Notes:
•
Available in TDI Mode only.
Example:
gfc 10
Performing PRNU to a user entered value
Purpose:
Performs PRNU calibration to user entered value and eliminates the difference in
responsivity between the most and least sensitive pixel creating a uniform response to light.
Using this command, you must provide a calibration target.
Executing these algorithms causes the
ssb, sag and sab
commands to be set to 0 (no
background addition or subtraction, and unity system gain) and the
ssg
command to 4096
(unity digital gain).
Syntax:
cpa m i
Syntax Elements:
m
PRNU calibration algorithm to use:
