Control method, projection system, and non-transitory computer-readable storage medium storing program

1 . A control method for a projection system, the projection system comprising a projection device that includes a light modulator including a plurality of pixels and that projects one or a plurality of stripe patterns including a bright part and a dark part onto a projection target, and an image pickup device that picks up an image of the one or the plurality of stripe patterns projected on the projection target, the control method comprising:

causing the light modulator to draw a drawn image including a first part having a first number of pixels;

causing the projection device to project the drawn image as a projection image onto the projection target;

causing the image pickup device to pick up the projection image including a second part corresponding to the first part and thus acquire a picked-up image; and

determining a minimum width of the bright part or the dark part detectable by the image pickup device, based on the first number of pixels and a second number of pixels, which is a number of pixels of a third part corresponding to the second part of the projection image included in the picked-up image.

2 . The control method according to claim 1 , wherein the projection image is a first image having only a first color and is the first image different from the one or plurality of stripe patterns.

3 . The control method according to claim 2 , wherein the first image included in the picked-up image includes a plurality of sides forming an outline of the first image and included in the picked-up image, and

the third part is a first side, which is a shortest side of the plurality of sides.

4 . The control method according to claim 3 , wherein the first image includes a first corner, a second corner different from the first corner, and a side passing through the first corner and the second corner and forming the outline of the first image,

the third part is the side, and

the control method comprises:

determining whether the first corner and the second corner are included in the picked-up image; and

changing a size of the first image in such a way that both the first corner and the second corner are included in the picked-up image, when it is determined that the first corner or the second corner is included in the picked-up image.

5 . The control method according to claim 1 , wherein the projection image includes the one or plurality of stripe patterns, and

the first part includes the bright part or the dark part.

6 . The control method according to claim 1 , further comprising:

displaying a first message, when a stripe pattern of the bright part or the dark part having a smallest width of the plurality of stripe patterns is defined as a first stripe pattern and the minimum width is smaller than a width of the bright part or the dark part of the first stripe pattern.

7 . The control method according to claim 6 , further comprising:

changing a content of the first message according to the minimum width.

8 . The control method according to claim 1 , wherein a number of the plurality of stripe patterns projected from the projection device is changed according to a result of determining the minimum width.

9 . A projection system comprising:

a projection device that includes a light modulator including a plurality of pixels and that projects one or a plurality of stripe patterns including a bright part and a dark part onto a projection target; and

an image pickup device that picks up an image of the one or the plurality of stripe patterns projected on the projection target, wherein

the light modulator draws a drawn image including a first part having a first number of pixels,

the projection device projects the drawn image as a projection image onto the projection target,

the image pickup device picks up the projection image including a second part corresponding to the first part and thus acquires a picked-up image, and

a minimum width of the bright part or the dark part detectable by the image pickup device is determined, based on the first number of pixels and a second number of pixels, which is a number of pixels of a third part corresponding to the second part of the projection image included in the picked-up image.

10 . A non-transitory computer-readable storage medium storing a program, the program causing a processor installed in a projection device that includes a light modulator including a plurality of pixels and that projects one or a plurality of stripe patterns including a bright part and a dark part onto a projection target, to execute:

causing the light modulator to draw a drawn image including a first part having a first number of pixels;

projecting the drawn image as a projection image onto the projection target;

acquiring, from an image pickup device, a picked-up image formed by picking up the projection image including a second part corresponding to the first part; and

determining a minimum width of the bright part or the dark part detectable by the image pickup device, based on the first number of pixels and a second number of pixels, which is a number of pixels of a third part corresponding to the second part of the projection image included in the picked-up image.