【摘要】 对基于投影条纹图像的三维轮廓成像术中的图像预处理方法进行了分析和研究。针对条纹图像在条纹方向数据同性、对滤波窗口形状、大小和方向比较敏感的特点,提出了方向自适应滤波方法。该方法首先运用重心法计算条纹的方向,并根据直线拟合的线性相关度调整滤波窗口的大小,以取得更为准确的条纹方向。然后调整滤波窗口的方向,使之与光栅条纹的方向一致,最后再根据滤波效果优化窗口在长宽方向的参数,使之充分利用光栅条纹图像在条纹方向上的数据同性的特点,有效避免了条纹法线方向的数据变化对滤波带来的影响。实验结果表明,该方法比其他常规的单一方向的矩形、圆形窗等滤波方法具有更好的滤波效果。更多还原

【Abstract】 A novel method of directional adaptive filter for fringe image is proposed based on the investigation of pretreatment method of fringe image on three-dimensional pattern profilometry technique.For a fringe image filter,the direction and the size of filter window are quite sensitive characteristics.The gray values of the stripe image change periodically in the normal direction,and keep almost the same values in the stripe direction.The fringe direction is calculated by gravity method.The size of data window is automatically adjusted according to the linear dependency to get the correct direction.The length and the width of the filter window are optimized based on the filtering result checking.By this algorithm,it can get the correct stripe direction and the right size parameters of the filter windows,as a result to get the qualified filtered image.This method is verified by the experiments.更多还原