Multi-projection system, image projection method and projector

An image projection method for projecting an image onto a three-dimensional object from a plurality of projectors provided in a multi-projection system that comprises a master projector that is one of the plurality of projectors and that controls the operation of the multi-projection system, and a slave projector that is not the master projector in the plurality of projectors and that performs processing in accordance with an instruction of the master projector, the method comprising:

• estimating, by the slave projector, an amount of blur in an image projected from the slave projector itself in each of a plurality of planes of the three-dimensional object;
• providing, by the slave projector, the estimated amount of blur in an image to the master projector;
• estimating, by the master projector, an amount of blur in an image projected from the master projector itself in each of a plurality of planes of the three-dimensional object;
• and
• determining, by the master projector, regions of the image projected from the plurality of projectors based on the amount of blur in the image estimated by the master projector and based on the amount of blur in the image estimated by the slave projector so that the amounts of blur in the image in each of the plurality of planes are minimized, respectively.