运用余弦变换的三维物体面形轮廓术

Automated Profilometry of 3-D Diffuse Objects byUsing Cosine Transformation

首次提出通过对投影到物体表面的变形光栅图进行余弦变换以获得物体表面高度分布的方法，实验证实此方法比传统的傅里叶交换法有更高精度和更快处理速度，且易实现全场的自动处理。

A new method of automatitally reconstructing the 3-D surface of an objectfrom the deformed grating pettern is proposed. The method can automatically andaccurately obtain phase value at every pixel point without assigning fringe orders by usinga discrete cosine transform algorithm. It is flee from the errors caused by the higherharmonic components and the variation of light level. Theoretical analysis andexperimental verification are presented.