Full Reference Mode
- Choose the mode “Full Reference” from the pull down menu.
- Add GCPs by
- clicking the “Add GCP” icon and entering the name and co-ordinates in the GCP list.
- clicking the “Read GCP from Text File” button and choose the text based file (“.csv”, “.txt”, “.dat”, “.prt”).
- Activate one GCP in the list and localize its position in the 3D viewer by clicking the left mouse button. The list of reference images is updated and the active image is shown in the viewer.
- Active GCP in the list
- Localization of the GCP on the 3D model
- Active image
- Choose the “Manual Target Mode” or the “Automatic Mode” and centre the target by clicking with the mouse in the viewer. For locating the target discs the image should be zoomed as much as reasonable for visual interpretation. Check the position of the center by changing the size of the reticule. The reticule is well-centered if the circles touch the target’s boundary simultaneously at two opposing points and in two perpendicular directions.
- Choose at least 2 images (3 or more are recommended) showing the same GCP and click the center of target. The status signals Baseline and the Inliers turn into green and the error of re-projection and depth is displayed in the GCP list.
Switch between the individual images in the list by using the arrow keys “Up” and “Down”.
Marking of GCP positions is crucial for the metric accuracy of the 3D model and thus should be performed carefully.
Refer to the hints given in the Status Information, if one of status signals Baseline (distant ratio between images) and Inliers turn into orange or red.
- Activate the next GCP in the list and repeat steps 2 – 4. Continue until all GCP positions are localized.
- Check the error statistics and the Status Information (green status signals) and enable referencing by clicking the “Save” button.
- Choose an action form the pull down menu “Referencing” or close the MultiPhoto by clicking the “Exit” button.
A defined ROI (Chapter 7) does not limit the localization of GCP in the images. GCP may be located in images outside the generated 3D model by deactivating the “Enable image filter” checkbox. The whole set of images used for the generation of the 3D model, including images for Coarse Reconstruction, will be listed. The user has to select the images showing the GCP manually from the list.
GCP are excluded for referencing by clicking the corresponding checkboxes in front of their names in the GCP list.