User`s manual

Spyder3 S3-14 and S3-24 User's Manual 57

Teledyne DALSA 03-032-20117-00

This algorithm is more robust and repeatable than algorithm 1

because it uses an average pixel value rather than a number above

target. However, this algorithm is slower.

Peak target value in a range from 1024 to 4055DN. The target

value must be greater than the current peak output value.

Example

cpa 1 600

Performing PRNU Correction to a Camera Calculated Value

Performs PRNU correction and eliminates the difference in responsivity between the most and least

sensitive pixel creating a uniform response to light.

Camera Link Command

Parameter

Notes

ccp

 Perform all analog adjustments before calculating PRNU.

 Perform FPN correction before PRNU correction.

 If FPN cannot be calibrated, use the rpc command to reset all coefficients to zero,

and save them to memory with the wfc command. You can then adjust the digital

offset (sdo command) to remove some of the FPN.

 Ensure camera is operating at its expected analog gain, integration time, and

temperature.

 Refer to Calibrating the Camera to Remove Non-Uniformity (Flat Field

Correction)on page 51 for a procedural overview on performing flat field

correction.

To save FPN coefficients after calibration, use the wpc command. Refer to section

Saving and Restoring PRNU and FPN Coefficients for details.

Example

Setting a Pixel’s PRNU Coefficient

Sets an ind ivid ual pixel’s PRN U coefficient.

Camera Link Command

Parameter

Description

Notes

spc i i

The pixel number from 1 to sensor pixel count.

Coefficient value in a range from 0 to 28671 where:

PRNU coefficient =

1 +

4096