Automatic calibration

A non-transitory, tangible computer readable medium having instructions embedded thereon that, when executed, implement a method for automatically calibrating a projector-imaging device system including a semi-transparent screen, the method comprising:

• causing an image sequence to be captured from the semi-transparent screen and through the semi-transparent screen while a calibration pattern having features is displayed and not displayed in an alternating succession on the semi-transparent screen;
• creating a temporal correlation image from the image sequence and a discrete binary signal;
• identifying peaks in a spatial cross correlation image generated from the temporal correlation image, where a pattern of the identified peaks corresponds to a pattern of the features in the calibration pattern;
• transforming the peaks to coordinates of corrected feature points;
• and
• determining whether the projector-camera system is calibrated by comparing the corrected feature points with a ground truth set of coordinates for the features.

An automatic calibration system for a local system of a remote collaboration system, the automatic calibration system including:

• an image capturing engine to:
• cause an image sequence to be captured from a semi-transparent screen and through the semi-transparent screen of the local system while a calibration pattern having features is displayed and not displayed in an alternating succession on the semi-transparent screen;
• and
• a calibration engine to:
• create a temporal correlation image from the image sequence and a discrete binary signal;
• identify peaks in a spatial cross correlation image generated from the temporal correlation image, where a pattern of the identified peaks corresponds to a pattern of the features in the calibration pattern;
• transform the peaks to coordinates of corrected feature points;
• and
• compare the corrected feature points with a ground truth set of coordinates for the features to determine whether the local system is calibrated.