Device, system and method for generating updated camera-projector correspondences from a reduced set of test patterns

A method comprising:

• determining, at a controller of a computing device, from predetermined correspondences between projector points and camera points in an initial relative position of a projector and a camera having a common field of view at a surface, a function for mapping between the projector points and the camera points;
• controlling, using the controller, the projector to project, onto the surface, a first test pattern comprising:
• at least four projector points which cover a projected image field of the projector;
• controlling, using the controller, the camera to acquire a first image of the first test pattern;
• determining, using the controller, first imaged camera points in the first image;
• determining, via the controller using the function, corresponding camera points that correspond to the at least four projector points in the first test pattern;
• associating, using the controller, the first imaged camera points with the corresponding camera points to determine an estimation function for estimating movement of one or more of the camera points due to relative movement of the projector and the camera from the initial relative position to a current relative position;
• controlling, using the controller, the projector to project, onto the surface, a second test pattern comprising:
• a plurality of points determined from the predetermined correspondences, a number of the plurality of points of the second test pattern being greater than a respective number of points of the first test pattern;
• controlling, using the controller, the camera to acquire a second image of the second test pattern;
• determining, using the controller, second imaged camera points in the second image;
• generating, using the controller, updated correspondences between the camera points and the projector points in the current relative position using the estimation function and the second imaged camera points;
• and
• using, at the controller, the updated correspondences to control the projector to project images.