Create a shading-reference (PRNU)

1. Place a moving white target.
   If using a stationary target, place it slightly out of focus.

Acquire an image:

2. In the toolbar click Acquire a single frame 
   or 
   click Start grabbing, wait until an image is displayed,
   click Stop grabbing.

3. In the menu bar navigate to Tools → Calibration. 

4. Click Generate PRNU Reference.

The Generate PRNU Reference wizard opens.

5. Click Acquire image to generate the PRNU directly from the camera
   or
   click Load from Disk to load an image from the hard drive.

   NOTE: Load from Disk

   Make sure that the image has been taken with active image calibration mode by using the wizard.

The raw image and the line plot of the image is displayed. 

6. Click Start 2-Click-Selection. 

7. Click on the image to select the ROI.

Send the calculated PRNU to the camera: 

8. Select LUT 1 or LUT 2.

9. Click Send data to camera.

Activate brightness and contrast:

10. Select the Activate Brightness and contrast checkbox.

11. Set the contrast to 0.9.

In this instance, the lighting arrangement is single-colored and is visible in the camera's red color channel. The signals in the green and blue channels are quite minimal.

On the left of the image, you can observe the RGB image, while on the right, the profile of the horizontal line plot is displayed.

In this scenario, the result of the PRNU calibration should be a RED image exhibiting a uniform profile.

The "white balancing" process in the Independent calibration technique varies. The gain level needs to be modified for each specific gain. In this case, the Gain is solely applied to the Red channel.

1. In the menu bar navigate to Tools → Calibration.

2. Click Generate PRNU Reference.

The Generate PRNU Reference wizard opens.

4. Click Acquire image to generate the PRNU directly from the camera
   or
   click Load from Disk to load an image from the hard drive.

5. NOTE: Load from Disk

   Make sure that the image has been taken with active image calibration mode by using the wizard.

The raw image and the line plot of the image is displayed.

6. Click Start 2-Click-Selection.

7. Click on the image to select the ROI.

The view changed to the “Applied PRNU Reference”. This is the Output of the “Standard PRNU” Method. The image is very noisy.

8. Click on the button with the three dots …

9. The GUI changed an show more options.

10. Click on Find channel max, the PRNU algorithm will find the mean maximum value for each channel.

11. In a second step you can change the Target Value, in this example Target value Red to 200.

Send the calculated PRNU to the camera:

12. Select LUT 1 or LUT 2.

13. Click Send data to camera.

Activate brightness and contrast:

14. Select the Activate Brightness and contrast checkbox.

15. Set the contrast to 0.9.

This image illustrates the results of the calibration process. It is a uniform image.

On the right side, you can see the raw image and the Applied PRNU reference without the extrapolation function.
In the area with low image content, the Applied PRNU reference shows some artifacts.

1. Select the ROI, by using the Start-2-Click-Selection.

2. Press the button with the three dots on the bottom.

3. Enable your option, in this example the left extrapolation.

4. Select the start position of your extrapolation. The width defines the area where the extrapolation is created. From the start position to column 0, the extrapolation is applied.

5. Check the applied PRNU in the Applied PRNU reference tab.

1. Press the button with the three dots on the bottom.

2. Change the Target Value.

3. Check the applied PRNU in the Applied PRNU reference tab.