Download Agisoft PhotoScan User Manual - Professional Edition, Version 1.2

Editing
Reprojection error
High reprojection error usually indicates poor localization accuracy of the corresponding point
projections at the point matching step. It is also typical for false matches. Removing such points can
improve accuracy of the subsequent optimization step.
Reconstruction uncertainty
High reconstruction uncertainty is typical for points, reconstructed from nearby photos with small
baseline. Such points can noticeably deviate from the object surface, introducing noise in the point
cloud. While removal of such points should not affect the accuracy of optimization, it may be useful
to remove them before building geometry in Point Cloud mode or for better visual appearance of the
point cloud.
Image count
PhotoScan reconstruct all the points that are visible at least on two photos. However, points that are
visible only on two photos are likely to be located with poor accuracy. Image count filtering enables
to remove such unreliable points from the cloud.
Projection Accuracy
This criterion allows to filter out points which projections were relatively poorer localised due to their
bigger size.
To remove points based on specified criterion
1.
Switch to Point Cloud view mode using
Point Cloud toolbar button.
2.
Select Gradual Selection... command from the Edit menu.
3.
In the Gradual Selection dialog box specify the criterion to be used for filtering. Adjust the threshold
level using the slider. You can observe how the selection changes while dragging the slider. Click
OK button to finalize the selection.
4.
To remove selected points use Delete Selection command from the Edit menu or click
Selection toolbar button (or simply press Del button on the keyboard).
Delete
Filtering points based on applied masks
To remove points based on applied masks
1.
Switch to Dense Cloud view mode using
Dense Cloud toolbar button.
2.
Choose Select Masked Points... command from the Dense Cloud submenu of the Tools menu.
3.
In the Select Masked Points dialog box indicate the photos whose masks to be taken into account.
Adjust the edge softness level using the slider. Click OK button to run the selection procedure.
4.
To remove selected points use Delete Selection command from the Edit menu or click
Selection toolbar button (or simply press Del button on the keyboard).
Filtering points based on points colors
To remove points based on points colors
1.
Switch to Dense Cloud view mode using
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Dense Cloud toolbar button.
Delete