Digital Signal Processing - Dalsa Piranha HN HN-80-08k40-R User Manual

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Notes:
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:
prnu coefficient =
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:
Sytax
Syntax Elements:
03-032-20135-00
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.
Peak target value in a range from 4096 DN to 16220 DN. The target value must be
greater than the current peak output value.
Calibrate FPN before calibrating PRNU. If you are not performing FPN calibration then
issue the rpc (reset pixel coefficients) command.
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4096
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.
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