Dalsa Piranha ES-80-08k40-00-R User Manual page 64

64
PRNU Correction
Performing PRNU Correction
Purpose:
Syntax
N otes:
Performing PRNU to a user entered value
Purpose:
Syntax:
Syntax Elem ents:
03-032-20070-02
Perform s PRN U correction to a cam era calibrated peak value and
elim inates the d ifference in responsivity betw een the m ost and least
sensitive pixel creating a uniform response to light. For a com plete
d escription on how to use this com m and , see the Flat Field
Correction Overview on page 58.
ccp

Perform all analog ad ju stm ents before calcu lating PRN U.

Perform FPN correction before PRN U correction.

If FPN cannot be calibrated , u se the
coefficients to zero, and save them to m em ory w ith the
com m and . You can then ad ju st the d igital offset (
com m and ) to rem ove som e of the FPN .

ccp
The com m and is not available w hen the cam era shift
d irection is externally controlled . Direction control m u st be
stable w hile the cam era is calcu lating coefficients (see
Direction Control on page 26).

Ensu re cam era is operating at its expected analog gain,
integration tim e, and tem peratu re.

To avoid losing you r cu rrent d irection coefficients, you m u st
save the PRN U coefficients u sing the com m and
changing cam era shift d irection or changing from TDI to
Area Mod e.

Available in TDI Mod e only.

Execu ting these algorithm s cau ses the ssb com m and to be
set to 0 (no backgrou nd su btraction) and the ssg com m and
to 4096 (u nity d igital gain). The pixel coefficients are d isabled
(epc 0 0) d u ring the algorithm execu tion bu t retu rned to the
state they w ere prior to com m and execu tion.
Perform s PRN U calibration to user entered value and elim inates the
d ifference in responsivity betw een th e m ost and least sensitive pixel
creating a uniform response to light. Using this com m and , you m ust
provid e a calibration target.
Executing these algorithm s causes the ssb com m and to be set to 0
(no background subtraction) and the ssg com m and to 4096 (unity
d igital gain). The pixel coefficients are d isabled (epc 0 0) d uring the
algorithm execution but returned to the state they w ere prior to
com m and execution.
cpa i i
i
PRN U calibration algorithm to use:
1 = This algorithm first ad justs each tap's analog gain so that 8-
13% of pixels w ithin a tap are above the value specified in the
target value param eter. PRN U calibration then occurs using the
peak pixel in the region of interest.
This algorithm is recom m end ed for use only w hen FPN is
negligible and FPN coefficients are set to zero. Since this
Piranha ES-xx User Manual
rpc
com m and to reset all
wpc
sdo
wpc
before
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