Yes, you can digitize and then calibrate in Didger 5:
- Import the image(s) un-referenced (click the Un-referenced button in the Image Registration and Warping dialog).
- Digitize the information you need (or have it digitized).
- Go to Map | Coordinate Conversion to calibrate the image.
- Under the Coordinate System Settings section, click the Destination System button to specify a projection or change axis types. Specify the calibration units you will use to calibrate the image and click OK.
- Choose the Georeference radio button.
- Enter the World X and World Y coordinates for the first calibration point.
- Click on the image at that point location. To locate a point precisely, use SHIFT+click to zoom in and CTRL+click to zoom out.
- Click the Add button two or more times to add more calibration point rows, enter the World X and World Y coordinates for those points, and calibrate them on the image.
- When you are done calibrating the image, choose a Georeference Method (usually Affine Polynomial is best) and click OK.
Updated October 12, 2016