Epson Moverio Pro BT-2000 Developer's Manual page 109

Remarks

To cancel depth information acquisition, set null as the callback method.

This method can be executed regardless of the preview status or camera mode,

you can execute by selecting your own timing.
Registration is only canceled if null is registered as the callback method, or the

object is removed. Note that the callback method is not canceled by canceling the
preview or depth information acquisition.
MOVERIO Pro Developer's Guide (Rev.1.4)
103