Setting Analog Offset; Flat Field Correction; Flat Field Correction Overview - Dalsa PC-30-02K80-R Manual

Piranha Color Camera User's Manual
Notes:
Example:
Related
Commands:

Setting Analog Offset

Purpose:
Syntax:
Syntax Elements:
Notes:
Example:
Related Commands:

3.15 Flat Field Correction

Flat Field Correction Overview

This camera has the ability to calculate correction coefficients in order to remove non-
uniformity in the image. This video correction operates on a pixel-by-pixel basis and
Note: If your
implements a two point correction for each pixel. This correction can reduce or
illumination
or white
eliminate image distortion caused by the following factors:
reference
Fixed Pattern Noise (FPN)
does not
extend the
Photo Response Non Uniformity (PRNU)
full field of
Lens and light source non-uniformity Correction is implemented such that for each
view of the
pixel:
camera, the
camera will
send a
warning.
DALSA
Analog gain calibration requires constant light on a clean, white reference. White
plastic or white ceramic is ideal.
If very few tap pixels are within the ROI, gain calculation may not be optimal.
When all taps are selected, taps outside of the ROI are set to the average gain of the
taps that are within the ROI.
Perform analog gain algorithms before performing FPN and PRNU calibration.
All digital settings affect the analog gain calibration. If you do not want the digital
processing to have any effect on the camera gain calibration, then turn off all digital
settings by sending the commands: sdo 0 0, epc 0 0, ssb 0 0, ssg 0
4096, and sab 0 0.
ccg 2 0 3040
sag, ssg
Sets the analog offset. The analog offset should be set so that it
is at least 3 times the RMS noise value at the current gain.
DALSA configures the analog offset for the noise at the
maximum specified gain and as a result you should not need to
adjust the analog offset.
sao t i
t
Tap selection. Use 0 for all taps. Color selection limits the
taps that may be selected by this command. See scl for
further information.
i
Offset value in a range from 0 to 255DN (12 bit LSB).
To return the current analog offset value, use the command
gcp or get sao.
sao 2 35
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9/27/2007