Real-time image correction for interactive environment

In recent years, projectors are undergoing a transformation as they evolve from static output devices to portable, or communication systems. However, the projection images appear distorted unless the projector is precisely aligned to the projection screen. Generally many projection-based systems are corrected for oblique projection distortion using calibration methods (e.g., warping function). Computing a warping function uses fiducials or a special pattern projected to the screen. These methods are unable to automatically calibrate in real-time especially when a projector is moving. In this paper, we proposed an automatic calibration system in real-time. Our system makes up of a function to correct images that are only based on the degree angle of a mirror set up in front of the projector without attaching fiducials to the screen. Therefore the system can be used to display regardless of screen condition in parallelepiped room. This operation process is very simple and fast. Therefore our system provides a function of correcting movies during the movement of the projector (27.3fps). An advantage of the proposed method is the system can be easily applied to ubiquitous computing like interactive presentation or game.