Abstract: A correction method for solving the problem of incorrect stereo parallax due to inaccurate setting of projectors is proposed.According to the method for the creation and the display of stereoscopic images,several ways for constructing economical CAVE stereo display system are investigated.These ways include active stereo mode,active-to-passive stereo mode and direct passive mode.To generate a pair of distortion free stereo images on the screen with multi-channel stereo display system,we copy the synthesized images of the two eyes from the frame buffer to the texture buffer.Then we construct a B-spline surface for each eye by calculating the control points according to the re-projection information.The stereo images saved in the texture buffer are then mapped to the B-spline surface of each eye respectively.Thus,the geometric distortion of the stereo images can be resolved in a controllable way.The position and smoothness of each image can be further calibrated by adjusting the position of the control points and the order of the respective B-spline surface.Experimental data show that our calibration approach is effective and put little overhead to the real-time rendering of virtual scenes.