Patent ID: 8242973

Claim:
An image signal processing apparatus that receives an input of a first input image signal and a second input image signal and generates first and second projection image signals for projecting projection images from a first projector and a second projector so as to be superimposed on a screen, the image signal processing apparatus comprising: a storage unit that stores, for each projection position on the screen, a first intensity ratio between projected light from the first projector and projected light from the second projector when viewing from a first viewing position and a second intensity ratio between projected light from the first projector and projected light from the second projector when viewing from a second viewing position that differs from the first viewing position; an intensity correcting unit that adds the first input image signal and the second input image signal in proportions set for generating the first projection image signal according to the first intensity ratio and the second intensity ratio stored in the storage unit for each projection position, and adds the first input image signal and the second input image signal in proportions set for generating the second projection image signal according to the first intensity ratio and the second intensity ratio stored in the storage unit for each projection position; and an output unit that supplies the first projection image signal generated by addition by the intensity correcting unit to the first projector and supplies the second projection image signal generated by addition by the intensity correcting unit to the second projector.