Manual Select Point Pairs Registration

The manual point selection registration tool can be used for data correction between point clouds, images, and model data. Place the reference data and the data to be registered in two windows, select or fit spheres (for point cloud data) in both windows to obtain at least three pairs of corresponding points. Calculate the coordinate transformation matrix between the two datasets through these corresponding points to perform coordinate correction on the data. By selecting point pairs, users can view residuals between datasets in a list of corresponding points.

Point Pair Registration by Reference Files

1. Select or fit spheres (for point cloud data) in two windows to obtain at least three pairs of corresponding points. These corresponding points are used to calculate the coordinate transformation matrix between the two datasets for coordinate correction. By selecting point pairs, the user can view the residuals between the datasets in the corresponding point pairs list.

   

2. (Optional) Users can click Open Data to load known corresponding points from external sources, thus skipping steps 4, 5, and 6.

3. Click Select Corresponding Points or Select Target Sphere to select a point as the corresponding point in both the reference and registration windows.
4. After selecting a pair of corresponding points, click the Add Row button to add an empty row.
5. Repeat steps 3 and 4 to select at least three pairs of corresponding points.
6. (Optional) If a certain pair of corresponding points is not needed for coordinate transformation, there are two ways to achieve this: (1) Uncheck the row in the list; (2) Click Delete Corresponding Points to remove point pairs with large residuals.
7. (Optional) If the residual of a pair of corresponding points is large or if you want to correct the coordinates of the point pair, there are two ways to achieve this: (1) Select the corresponding point pair in the list and reselect the point in either the reference or registration window; (2) Double-click the coordinate value you want to modify and edit it directly.
8. (Optional) To view a particular pair of corresponding points, double-click the pair in the list to center it in the window.
9. (Optional) Click Save Data to save the selected corresponding points.

Registration by Control Points

1. Click Load Pair Points. Control point information is displayed in both the reference and registration windows. Users can toggle the display of control points in the registration window. Select the corresponding control points in the table and choose corresponding points in the registration window. These corresponding points are used to calculate the coordinate transformation matrix between the two datasets for coordinate correction. By selecting point pairs, users can view the residuals between the datasets in the corresponding point pairs list.

The other operations are the same as the point-to-point registration steps using reference files.

Toolbar

Load Pair Points: Import an existing corresponding points list file from external sources. For details on the format of the corresponding points list, refer to the appendix Homologous Points File Format.

Save Data: Save the selected corresponding points list as a txt file.

Add Point: After selecting a pair of corresponding points, click this button to add a new row in the table window.

Delete Point: To delete a row of corresponding points, select the row and click this button.

Pick Points: Select the corresponding points in the reference and registration windows.

Pick Registration Sphere: If using target spheres for matching in the point cloud, this tool can be used to select and automatically fit the target sphere. The coordinates of the corresponding point will be the center of the sphere.

In the lower toolbar, the buttons from left to right are Point Size, Adjust Scale, Predict.