Automatic mode switching between single and multiple projectors

A control module for a multiprojector system, wherein the multiprojector system comprises multiple projectors arranged in a projector array, the module comprising:

• an object detection module constructed to determine whether the projector array is positioned to form one single object or is positioned to form two or more objects;
• a homography transformation module constructed to derive a homography transformation for each of the projectors so as to accommodate keystone correction of all projectors involved in the projection of a single object in a first mode, and to derive a homography transformation for each of the projectors so as to accommodate keystone correction of all projectors involved in the projection of each object in a second mode,
• wherein the homography transformation module is further constructed to apply inverses of the derived homography transformations, and
• wherein the first keystone correction mode is selected in response to a determination that the projector array is positioned to form one object, and the second keystone correction mode is selected in response to a determination that the projector array is positioned to form two or more objects.

A control apparatus for a multiprojector system, wherein the multiprojector system comprises multiple projectors arranged in a projector array, and wherein a first group of the multiple projectors is positioned to form a first object and a second group of the multiple projectors is positioned to form a second object, the apparatus comprising:

• a computer-readable memory constructed to store computer-executable process steps;
• and
• a processor constructed to execute the computer-executable process steps stored in the memory;
• wherein the process steps stored in the memory comprise computer-executable process steps to:
• determine whether the projector array is positioned to form one single object or is positioned to form two or more objects;
• select one of at least first and second keystone correction modes, wherein the first keystone correction mode is selected in response to a determination that the projector array is positioned to form one object, and the second keystone correction mode is selected in response to a determination that the projector array is positioned to form two or more objects;
• wherein in the first keystone correction mode, a homography transformation for each of the projectors is derived so as to accommodate keystone correction of all projectors in the projector array involved in the projection of the single object;
• and
• wherein in the second keystone correction mode, a homography transformation for each of the projectors is derived so as to accommodate keystone correction of projectors involved in the projection of each object;
• and
• apply inverses of the derived homography transformations.

A control apparatus for a multiprojector system, wherein the multiprojector system comprises multiple projectors arranged in a projector array, and wherein a first group of the multiple projectors is positioned to form a first object and a second group of the multiple projectors is positioned to form a second object, the apparatus comprising:

• a computer-readable memory constructed to store computer-executable process steps;
• and
• a processor constructed to execute the computer-executable process steps stored in the memory;
• wherein the process steps stored in the memory comprise computer-executable process steps to:
• derive a homography transformation for each of the projectors in the first group of projectors so as to accommodate keystone correction of all projectors in the first group of projectors;
• derive a homography transformation for each of the projectors in the second group of projectors so as to accommodate keystone correction of all projectors in the second group of projectors;
• apply inverses of the derived homography transformations.

A computer-readable memory medium on which is stored computer-executable process steps for controlling a multiprojector system, wherein the multiprojector system comprises multiple projectors arranged in a projector array, the process steps comprising:

• determining whether the projector array is positioned to form one single object or is positioned to form two or more objects;
• selecting one of at least first and second keystone correction modes, wherein the first keystone correction mode is selected in response to a determination that the projector array is positioned to form one object, and the second keystone correction mode is selected in response to a determination that the projector array is positioned to form two or more objects;
• wherein in the first keystone correction mode, a homography transformation for each of the projectors is derived so as to accommodate keystone correction of all projectors in the projector array involved in the projection of a single object;
• and
• wherein in the second keystone correction mode, a homography transformation for each of the projectors is derived so as to accommodate keystone correction of projectors involved in the projection of each object;
• and
• applying inverses of the derived homography transformations.