Tracking a Dense Point Cloud

The next step towards creating a dense point cloud is to track your footage for more 3D feature points using the information from keyframes in the sequence and the solved Camera.

1.

Click Track Points to track the sequence and create a dense point cloud.

An example 3D point cloud.

The default settings work well on most sequences, but you can adjust the Dense Tracking controls to alter the appearance of the cloud:

2.

Adjust the Point Separation control to set the separation value, in pixels, between points in the point cloud.

As you can see, lower values produce denser clouds, but at the expense of processing time.

Point Separation 0.	Point Separation 10.

3.

Set the Track Threshold to compare the similarity of features over a number of frames and reject them if they exceed the threshold. You can adjust this value to test whether a track is reliable.

Low threshold.	High threshold.

Note:  If the threshold is set too high, you may find that you don’t get any reliable tracks at all. The red pixels in the above image are rejected tracks.

4.

Proceed to Filtering Your Point Cloud.