Interactive projection system, projector thereof, and control method thereof

A projector, the projector having a built-in operating system, the operating system having a plurality of applications with corresponding graphical user interfaces, the projector comprising:

• a projecting module, for projecting a projected image being present of the operating system onto a screen;
• an image capturing module, for capturing an image generated by projecting a light spot onto the screen, wherein the light spot is generated by a pointing device;
• and
• a processing module, for obtaining a coordinate of the light spot according to the image generated by projecting the light spot onto the screen, and determining whether the light spot has stayed on the graphical user interface associated with an application of the plurality of applications on the projected image, so as to execute the application corresponding to the light spot.

A control method for controlling a projector, comprising:

• projecting a projected image being present of an operating system built-in to the projector onto a screen, wherein the operating system comprises a plurality of applications with corresponding graphical user interfaces;
• capturing an image generating by projecting the light spot onto the screen, wherein the light spot is generated by a pointing device;
• determining whether the light spot has stayed on the graphical user interface associated with an application of the plurality of applications;
• and
• executing the application corresponding to the light spot, if the light spot has stayed on the graphical user interface associated with the application of the plurality of applications.