Image projection system, projector, and method for controlling image projection system

1. An image projection system comprising:

a processor;

a first projector; and

a second projector,

wherein the first projector includes

a first light modulator that projects a first image on a projection surface, and

a first image sensor that captures an image of an area including the first image projected by the first light modulator,

the second projector includes

a second light modulator that projects a second image on the projection surface, and

a second image sensor that captures an image of an area including the second image projected by the second light modulator, and

the processor is programmed to

determine an overlap area based on the image captured by the first image sensor and the image captured by the second image sensor,

set a blend area that includes the overlap area and is equal to or larger than the overlap area,

determine a first luminance distribution of the first image from the image captured by the first image sensor,

determine a second luminance distribution of the second image from the image captured by the second image sensor,

determine a plurality of post-blending luminance distributions based on the first luminance distribution and the second luminance distribution, and

determine first luminance adjustment information to adjust luminance of the first image, and second luminance adjustment information to adjust luminance of the second image, based on (i) the blend area, (ii) an ideal luminance distribution, and (iii) one of the plurality of post-blending luminance distributions.

2. The image projection system according to claim 1 , wherein the processor is programmed to determine the first luminance adjustment information and the second luminance adjustment information representing a luminance change corresponding to the overlap area.

3. The image projection system according to claim 1 ,

wherein the first projector adjusts the luminance of the first image projected by the first light modulator based on the first luminance adjustment information, and

the second projector adjusts the luminance of the second image projected by the second light modulator based on the second luminance adjustment information.

4. The image projection system according to claim 1 , wherein the first projector includes the processor.

5. The image projection system according to claim 1 , wherein the blend area is larger than the overlap area.

6. A projector connected to an external projector, the projector comprising:

a light modulator that projects a first image;

an image sensor that captures an image of an area including the first image projected by the light modulator;

a communication interface that acquires a captured image produced by the external projector and containing an area including a second image projected by the external projector; and

a processor programmed to

determine an overlap area based on the image captured by the image sensor and the captured image acquired by the communication interface,

set a blend area that includes the overlap area and is equal to or larger than the overlap area,

determine a first luminance distribution of the first image from the image captured by the first image sensor,

determine a second luminance distribution of the second image from the image captured by the second image sensor,

determine a plurality of post-blending luminance distributions based on the first luminance distribution and the second luminance distribution, and

determine first luminance adjustment information to adjust luminance of the first image, and second luminance adjustment information to adjust luminance of the second image, based on (i) the blend area, (ii) an ideal luminance distribution, and (iii) one of the plurality of post-blending luminance distributions.

7. The projector according to claim 6 , wherein the processor is further programmed to output the second luminance adjustment information to the external projector.

8. The projector according to claim 6 , wherein the blend area is larger than the overlap area.

9. A method for controlling an image projection system including a first projector and a second projector, the method comprising:

causing the first projector to project a first image and causing the second projector to project a second image;

causing the first projector to capture an image of an area including the first image projected by the first projector;

causing the second projector to capture an image of an area including the second image projected by the second projector;

determining an overlap area based on the image captured by the first projector and the image captured by the second projector,

setting a blend area that includes the overlap area and is equal to or larger than the overlap area,

determining a first luminance distribution of the first image from the image captured by the first image sensor,

determining a second luminance distribution of the second image from the image captured by the second image sensor,

determining a plurality of post-blending luminance distributions based on the first luminance distribution and the second luminance distribution, and

determining first luminance adjustment information to adjust luminance of the first image, and second luminance adjustment information to adjust luminance of the second image, based on (i) the blend area, (ii) an ideal luminance distribution, and (iii) one of the plurality of post-blending luminance distributions.

10. The image projection system according to claim 1 , wherein the processor is further programmed to output the second luminance adjustment information to the second projector.

11. The method of claim 9 , wherein

the first projector determines the overlap area,

the first projector sets the blend area,

the first projector determines the first luminance adjustment information and the second luminance adjustment information, and

the first projector outputs the second luminance adjustment information to the second projector.

12. The method of claim 9 , wherein the blend area is larger than the overlap area.