Convert an Existing Calibration File

You can create a custom calibration file (.CCF), either by manually entering camera and lens data, or by converting an existing calibration file. A calibration file is required when you have had your camera and lens(es) calibrated using either iWitness, or its lite version equivalent, Camera Calibrator. This article explains how to convert a pre-existing calibration file. See also Manually Create a Custom Calibration File.

Camera Calibrator produces a text file (.TXT) and iWitness produces an iWitness file (.IWP). Either of these files can be used to produce a custom calibration file (.CCF) which Sirovision uses to apply calibration data to individual TIFF images.

Activity Steps

1. Open the Application Menu and select Photogrammetry » Create Camera Calibration.

   The Create Custom Calibration Wizard displays.

2. Click Next.
3. Select Convert Existing Calibration File.
4. Click Browse.
5. Navigate to the file and click Open.
6. Click Next.

   The Camera Settings window displays with some fields pre-filled from the calibration file.

   Notes:

   The Lens Model may require editing. This information can be obtained from the lens documentation when purchased, by visiting the appropriate web site for the lens manufacturer, or from information contained in the name of the Camera Calibrator or iWitness project file.

   The Serial Number of the lens is etched into the lens body on the end that attaches to the camera.

7. Enter the camera Serial Number.
8. Click Next.
9. Enter the lens Manufacturer.
10. Enter the lens Model, if required.
11. Enter the lens Serial Number, if required.
12. Enter the Nominal Focal Length.
13. Adjust the Actual Focal Length, if required.
14. Click Next.
15. Click Finish.

    The window closes. The new calibration file is created in the same location as the original file.