Piranha HN RoHS User Manual
03-032-20135-00
Teledyne DALSA
44
2
= Calculates the PRNU coefficients using the entered target value as shown below:
4
= Same calculation above, only in ROI.
The calculation is performed for all sensor pixels but warnings are only applied to
pixels in the region of interest. This algorithm is useful for achieving uniform output
across multiple cameras. It is important that the target value (set with the next
parameter) is set to be at least equal to the highest pixel across all cameras so that all
pixels can reach the highest pixel value during calibration.
i
Peak target value in a range from 4096 DN to 16220 DN. The target value must be
greater than the current peak output value.
Notes:
•
Calibrate FPN before calibrating PRNU. If you are not performing FPN calibration then
issue the
rpc
(reset pixel coefficients) command.
Example:
cpa 2 16000
Setting a Pixel’s PRNU Coefficient
Purpose:
Sets an individual pixel’s PRNU coefficient.
Syntax:
spc i1 i2
Syntax Elements:
i1
The pixel number from 1 to sensor pixel count.
i2
Coefficient value in a range from 0 to 61440 where:
Reading the PRNU Coefficient
Purpose:
Read the PRNU coefficient.
Syntax:
gpc x
Syntax Elements:
x
x = pixel number to read in a range of 1 to 8192.
Resetting the Pixel Coefficients
Purpose:
Resets the pixel coefficients to a value of 0.
Syntax:
rpc
Digital Signal Processing
Subtracting Background
Purpose:
Use the background subtract command after performing flat field correction if you
want to improve your image in a low contrast scene. You should try to make your
darkest pixel in the scene equal to zero.
Sytax
ssb i
Syntax Elements:
i
prnu coefficient =
i
4096
1 +
