Dalsa Spyder3 SC-30-02K80-00-R, User Manual

Page: 47 / 111

Spyder3 Color Manual 47
DALSA 03-032-20059-01
Analog Signal Processing
Black Level Offset Algorithm: Inherent to the A/D is an offset that is added to the video
in order to eliminate video clipping in dark (the offset is also affected by temperature).
The Spyder3 Color Cameras have an automatic subtraction of this offset, which is called
the Black Level Offset Algorithm. This subtraction helps prevent any unwanted color
shift. For example, if the offset is 15 DN in 12-bit multiplying by max gain (20 dB) will
give 300 DN (12-bit) offset in the final value. With Black Level Offset digital gain only
affects the color signal and not the underlining analog offset. The sole job of the Black
Level Offset Algorithm is to keep the offset around 0 DN regardless of analog offset
setting or the change in dark current (temperature). 0 DN offset is desirable because you
do not want your color gains changing your offsets for each color.
Digital Signal Processing
To optimize camera performance, digital signal processing should be completed after any
analog adjustments.
FPN Correction
Performing FPN Correction
Syntax: Performs FPN correction and eliminates FPN noise by removing
individual pixel dark current.
Syntax:
ccf
Notes: 
Perform all analog and digital adjustments before
performing FPN correction.

Perform FPN correction before PRNU correction.

Refer to Calibrating the Camera to Remove Non-Uniformity
(Flat Field Correction) on page 44 for a procedural overview
on performing flat field correction.

To save FPN coefficients after calibration, use the
wfc
command. Refer to section 4.10 Saving and Restoring PRNU
and FPN Coefficients for details.
Related Commands:
wfc
Example:
ccf