一种适应多几何面投影的校正算法

Adaptive Calibration Algorithm for Multi-geometric Projection

为实现投影仪在多种常见投影面上的自适应投影,提高几何校正效率,提出了一种多几何面函数自适应校正算法。利用特征点自动拟合出曲幕函数,通过自动筛选该函数对应像素映射关系,并计算投影图片像素偏移量;再按修正程度对投影幕进行切割;最后利用切割纹理顶点坐标校正前后坐标关系实现几何校正。实验结果表明,算法可以简单快速地完成柱面、球面、墙角等常见曲面,以及投影仪非正投影等情况下的几何畸变校正,具有良好的实际应用价值。

In order to realize the adaptive projection of the projector on a variety of common projection planes and improve the efficiency of geometric correction,a multi-geometric function for adaptive correction algorithm is proposed. The algorithm uses the feature points to auto-matically fit out the curvilinear function. By automatically filtering the function corresponding to the pixel mapping relationship and calculating the projection pixel offset,the projection screen is cut according to the degree of correction,and finally the coordinates of the vertex are corrected by cutting the texture relationship to achieve geometric correction. The experimental results show that the proposed algorithm can achieve the practical application value of geometric distortion correction,such as cylindrical surface,spherical surface,common surface and projector non-projection,simply and quickly.