Several embodiments of 3D display system and systems and methods for their calibration are disclosed herein. In one embodiment, a method and system for calibrating a 3D display using feedback indicative of measurements of light, emitted from the 3D display (typically during display of a test pattern), by a camera device. In one embodiment, the camera device is a handheld camera device including an inexpensive, uncalibrated camera. In another class of embodiments, a system including a 3D display (to be recalibrated), a video preprocessor coupled to the display, and a feedback subsystem including a camera device operable to measure light emitted by the display are also disclosed.