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If you must use white paper, make sure it is moving during the calibration
o
process. If you do not do this, your image will have vertical stripes.
Calibration is easily performed using the TLC 'cpa' command.
The cpa command has two parameters.
The first is the number of lines you want to average over. Use a value of
o
4096* to achieve the best average.
The second is the eight bit target value you want for all three colors after
o
calibration.
The cpa command takes several seconds to complete. The slower the line rate, the
longer it will take.
On completion of the 'cpa' command, you should see an image from the camera that
is white balanced with all three colors at the target level you set.
You are now ready to evaluate the image quality of the P4 color camera under your
operating conditions.
6. Improving Your Color Image
The color response of the P4 color camera is quite good even when using white LED's
without color correction. A white LED color correction matrix can be entered to improve
color response for those using white LED's. If you are using a different light source, a
suitable color correction matrix should be entered in the camera. You will require a Gretag
Macbeth ColorChecker with 4 x 6 color elements that you can scan past the camera to
complete the generation of the matrix.
Contact Teledyne DALSA's technical support for further details.
03-032-20274-00
Piranha4 8k Color Camera User's Manual
Teledyne DALSA
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