The spherical gear is a new type of gear formed by attributing ring teeth on a spherical face.
球齿轮是在其球冠面上分布着一道道环形齿的一种新型齿轮。
A 3-d face model is constructed by the imaging theory and spherical harmonics, combining with the principle of 3-d projection and PCA.
根据3 -D数据的优势，利用图像成像原理和球面调和函数理论，结合3 - D投影原理和PC A技术建立了一个3 - D人脸模型。
Flat or spherical measuring face.
测头为平面还是球面。
Flat or spherical measuring face.
测头为平面还是球面。
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