Projection system, projector apparatus, image capturing apparatus, and projection method

A projection system that sets any shape as a projection target and projects an image onto the projection target such that geometric distortion of the projected image as viewed from a user's viewpoint is reduced, the projection system comprising:

• projection circuitry, located at a first position, configured to project an image onto the projection target, the projection circuitry projecting a test image for first adjustment;
• three-dimensional shape measurement circuitry configured to measure a three-dimensional shape of the projection target;
• imaging circuitry configured to capture the test image for first adjustment projected from the projection circuitry from a first imaging point, which is a second position different from the first position, to obtain a captured image for first adjustment;
• and
• projected image adjustment circuitry configured to perform first adjustment processing for correcting an image such that geometric image distortion viewed from the first imaging point, at which the captured image for first adjustment has been captured, is reduced, based on the three-dimensional shape data measured by the three-dimensional shape measurement circuitry and the captured image for first adjustment obtained by the imaging circuitry.