[djmips]

Probably the very smart spy camera can detect off axis TOF artificial light and close a shutter over the lens. Assuming your app integrates over the scanning motion, the camera won't be detected while it's shutter is closed. After the illumination is completed the spy camera can re-open it's shutter.

The spy camera could also something like your system to detect the phone camera and take defensive measures.

[frizensami]

Yes, perhaps. At the very least, adding a variable shutter and extra logic will drive up the price of the camera, which will be some consolation.

[loonster]

A honeycomb lens filter (commonly used in military rifle optics) would greatly reduce the angle that the camera can be detected.

[chii]

what about fiber-optics to direct light from a pin-hole? would the entrance of the fiber-optics cable be detectable this way?