White Min Radius

The minimum length of the longest axis of the ellipse that makes up a white blob (in pixels). Default is 4 pixels.

In a similar way to Max Radius, when specifying this value, you have to balance the possibility of setting this value too high and missing markers against setting it too low and slowing the tracking and detecting unwanted blobs.

White Max Radius

The maximum length of the longest axis of the ellipse that makes up a white blob (in pixels). Default is 50 pixels.

If you set this value higher than required, tracking is slowed and unwanted blobs may be detected. If you set the value too low, markers may not be tracked for the entire take if they change shape. If you suspect this may happen, use Blob Preview on the relevant frames to make sure you will get good tracking throughout the take.

Black Min Radius

The minimum length of the longest axis of the ellipse that makes up a black blob (in pixels). Default is 4 pixels.

In a similar way to Max Radius, when specifying this value, you have to balance the possibility of setting this value too high and missing markers against setting it too low and slowing the tracking and detecting unwanted blobs.

Black Max Radius

The maximum length of the longest axis of the ellipse that makes up a black blob (in pixels). Default is 50 pixels.

If you set this value higher than required, tracking is slowed and unwanted blobs may be detected. If you set the value too low, markers may not be tracked for the entire take if they change shape. If you suspect this may happen, use Blob Preview on the relevant frames to make sure you will get good tracking throughout the take.

Find Black Blobs

When selected, the blob detector searches for black markers.

Default is True (selected).

Find White Blobs

When selected, the blob detector searches for white markers.

Default is False (cleared).

Black Threshold

Range is 0–1, default is 0.4. This value changes the level at which black blobs are detected. Vicon CaraPost compares each potential blob it finds with an internal model of blob appearance, learned from many example blobs. The threshold value determines how rigorously it applies the criteria for deciding whether it has found a blob. At zero almost everything is detected as a blob, whereas at 1, only blobs that match precisely are detected.

To detect more blobs, lower this value. If too many blobs are detected, you can delete them later.

White Threshold

Range is 0–1, default is 0.4. This value changes the level at which white blobs are detected. Vicon CaraPost compares each potential blob it finds with an internal model of blob appearance, learned from many example blobs. The threshold value determines how rigorously it applies the criteria for deciding whether it has found a blob. At zero almost everything is detected as a blob, whereas at 1, only blobs that match precisely are detected.

To detect more blobs, lower this value. If too many blobs are detected, you can delete them later.