Abstract: A projection image adjustment method includes acquiring a captured image produced by capturing an image of a range containing a first and second region in a situation wherein a first projector projects a first image having uniform luminance toward a first region and a second projector projects a second image having uniform luminance toward a second region overlapping part of the first region, identifying based on the captured image the brightness at a third region where the first region and the second region overlap each other, and the brightness at a fourth region that is part of the first region and does not overlap with the second region, adjusting the first image when the fourth region is darker than the third region, and not performing correction that adjusts the first image to increase the highest brightness at the fourth region when the fourth region is brighter than the third region.

Abstract: A display method according to an aspect of the present disclosure including: sequentially displaying M different pattern images GOP, by a display device configured to display a display image, when an operation mode of the display device is a first operation mode, M being a natural number; correcting the display image based on a first captured image group acquired by imaging the M different pattern images GOP; sequentially displaying N different pattern images GOP by the display device when the operation mode of the display device is a second operation mode different from the first operation mode, N being a natural number smaller than the M; acquiring a second captured image group acquired by imaging the N different pattern images; and correcting the display image based on the second captured image group.

Abstract: A position detection method includes projecting a first pattern image on a display surface, the first pattern image including a first region having a first color corresponding to a first portion of a first identification information indicating the first region and a second region having a second color corresponding to a first portion of a second identification information, obtaining a first captured image by capturing the display surface, projecting a second pattern image onto the display surface including the first region having a third color which corresponds to a second portion of the first identification information and the second region having a fourth color corresponding to a second portion of the second identification information, obtaining a second captured image by capturing the display surface, associating a first position in an image projected with a second position in a third captured image obtained by capturing the display surface.

Abstract: A position detection method includes projecting a first pattern image on a display surface, the first pattern image including a first region having a first color corresponding to a first portion of a first identification information indicating the first region and a second region having a second color corresponding to a first portion of a second identification information, obtaining a first captured image by capturing the display surface, projecting a second pattern image onto the display surface including the first region having a third color which corresponds to a second portion of the first identification information and the second region having a fourth color corresponding to a second portion of the second identification information, obtaining a second captured image by capturing the display surface, associating a first position in an image projected with a second position in a third captured image obtained by capturing the display surface.