Dalsa Spyder3 S3-14-01k40-00-R User Manual

Spyder3 S3-14 and S3-24 Monochrome Camera User's Manual 51
Teledyne DALSA 03-032-20117-01
Calibrating the Camera to Remove Non-Uniformity (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 implements a two-point correction for
each pixel. This correction can reduce or eliminate image distortion caused by the following factors:
 Fixed Pattern Noise (FPN)
 Photo Response Non Uniformity (PRNU)
 Lens and light source non-uniformity
Correction is implemented such that for each pixel:
V
output
=[(V
input
- FPN( pixel ) - digital offset) * PRNU(pixel) – Background Subtract] x System Gain
where
V
output
=
digital output pixel value
V
input
=
digital input pixel value from the CCD
PRNU( pixel)
=
PRNU correction coefficient for this
pixel
FPN( pixel )
=
FPN correction coefficient for this pixel
Background
Subtract
=
background subtract value
System Gain
=
digital gain value
The algorithm is performed in two steps. The fixed offset (FPN) is determined first by performing a
calibration without any light. This calibration determines exactly how much offset to subtract per pixel in
order to obtain flat output when the CCD is not exposed.
The white light calibration is performed next to determine the multiplication factors required to bring
each pixel to the required value (target) for flat, white output. Video output is set slightly above the
brightest pixel (depending on offset subtracted).

Dalsa Spyder3 S3-14-01k40-00-R Specifications

General

Brand	Dalsa
Model	Spyder3 S3-14-01k40-00-R
Category	Security Camera
Language	English