Image projection system able to emphasize or cancel objects drawn on a surface

An image projection method comprising the steps of:

• projecting a projected image onto a projection surface;
• detecting a drawn image drawn on said projection surface while the projected image is being projected in said projecting step;
• and
• in the case where said drawn image is detected, specifying from said projected image which is projected onto the projection surface a part including at least a drawn image part overlapping said detected drawn image, and modifying the specified part of said projected image, on the basis of the detected drawn image, so as to emphasize said drawn image, wherein said modifying step includes an emphasizing compensation step of specifying a target part including the drawn image part in which said projected image being projected onto said projection surface and said detected drawn image overlap each other and a periphery of the drawn image part, and modifying said target part so as to emphasize said drawn image.

An image projection program embodied on a non-transitory computer readable medium, the program causing a computer to perform the steps of:

• projecting a projected image onto a projection surface;
• detecting a drawn image drawn on said projection surface while the projected image is being projected in said projecting step;
• and
• in the case where said drawn image is detected, specifying from said projected image which is projected onto the projection surface a part including at least a drawn image part overlapping said detected drawn image, and modifying the specified part of said projected image, on the basis of the detected drawn image, so as to emphasize said drawn image, wherein said specifying includes an emphasizing compensation which specifies a target part including the drawn image part in which said projected image being projected onto said projection surface and said detected drawn image overlap each other and a periphery of the drawn image part, and modifies said target part so as to emphasize said drawn image.