Image processing device, image display system, image processing method, and program

A non-transitory computer readable storage medium storing a program for causing a computer to perform an image processing method of generating data for generating an overlap image by overlapping an image formed by an image forming device and an image projected by an image projection device, the image processing method comprising:

• acquiring variation information that identifies variations in a brightness of environment illumination from a first environment to a second environment
• setting, based on the variation information, environment reference illumination;
• generating, by separating a signal of input image data based on the set environment reference illumination, first image data for the image forming device and second image data for the image projection device;
• acquiring environment illumination information relating to environment illumination in generating the overlap image;
• and
• correcting the second image data based on the environment illumination information.

A computer-implemented method for generating data for generating an overlap image by overlapping an image formed by an image forming device and an image projected by an image projection device, the computer-implemented method comprising:

• acquiring variation information that identifies variations in a brightness of environment illumination from a first environment to a second environment;
• setting, based on the variation information, environment reference illumination;
• generating, by separating a signal of input image data based on the set environment reference illumination, first image data for the image forming device and second image data for the image projection device;
• acquiring environment illumination information relating to environment illumination in generating the overlap image;
• and
• correcting the second image data based on the environment illumination information.