Dalsa Spyder3 Manual de usuario descargar pdf (Pagina 53)

Spyder3 GigE Vision SG-14 Monochrome Cameras User’s Manual 53

Teledyne DALSA 03-032-20123-01

Step 1: Prepare for Calibration

For best results, the camera should be setup for calibration with similar conditions as to those in which it

will be used. For example, data mode, exposure times and line rates, scan direction, etc.

Step 2: FPN Calibration

Note that you do not need to turn off the FPN and PRNU coefficients before calibrating, the camera will

do this automatically.

1. Stop all light from entering the camera. The best way to do this is to put on lens cap.

2. Calibrate FPN using the FPN Calibrate command.

3. Use the Read FFC Calibration Result parameter to determine if your calibration was a success or

not.

4. To save the calibrated FPN coefficients to the FFC coefficient set shown, use the Set FPN Save

parameter.

Step 3: PRNU Calibration: White Calibration

Performs PRNU calibration to user entered value and eliminates the difference in responsivity between

the most and least sensitive pixel creating a uniform response to light. Using this command, you must

provide a calibration target.

Executing these algorithms causes the Background Subtract Raw value to be set to 0 (no background

subtraction) and the Digital Gain Raw value to 4096 (unity digital gain). The pixel coefficients are

disabled (Pixel Set Load 0) during the algorithm execution but returned to the state they were prior to

command execution.

1. Remove the lens cap and prepare a white, uniform target.

2. Adjust the line rate so that the average output is about 80% of the full output by : adjusting the

lighting, if you are using an internal exposure mode. O r, adjust the line rate, if you are using the

Smart Exsync mode.

3. Set the PRNU target value using the Target to Calibrate PRNU command. The target value (always

counted as 12-bit) and is 1024 to 4055 DN. For example, if you want to set the target to 255 x 80% =

204 DN in 8-bit mode, then the target value is (204/ 255) x 4096 = 3277 DN in 8-bit mode. Therefore,

you can set the target to 3300 DN: Target to Calibrate PRNU is 3300.

4. Calibrate the PRNU using the PRNU Calibrate command.

5. Use the Read FFC Calibration Result parameter to determine if your calibration was a success or

not—see the belowfor the possible results.

6. To save the calibrated PRNU coefficients to the FCC coefficient set shown, use the Set PRNU Save

parameter.

7. After the above command is completed, both the FPN and PRNU coefficients are automatically

turned on.

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Dalsa Spyder3 Manual de usuario Pagina 53