Recently, wide view-angle image projection in our accessible environments like a general room is focused as next generation IPT. Image projection onto arbitrary shaped surfaces of the room causes geometrical distortions. and some correction techniques with structured-light pattern projection are often used for that. However, such environment is surrounded with the surfaces as a screen, and complex indirect reflection disturbs precise recognition of the projected patterns. And then, the accuracy of the geometrical correction is greatly deteriorated. Therefore, in this research, we propose a technique for reducing the effects of the indirect reflected light by subdividing the projected patterns, and achieving high accuracy geometrical correction in such general rooms. This technique greatly contributes to making a general room into an immersive projection environment.
