🚨 No longer maintained. Check out fSpy instead 🚨 A camera and projector calibration toolkit for Blender that also does automatic 3D reconstruction of geometry with rectangular faces.
If I recall correctly, the 3D view has to be visible when performing the camera calibration in order for the background image to be set. This seems to be an Blender limitation.
Running OSX, blender 2.66a.
BLAM isn't importing the background image into 3d view on calibration of the camera. Not sure why.