三维颅骨特征点的自动标定

提出了颅骨特征点的全自动标定方法，该方法利用分区统计可变模型及模型相似性匹配的方法来标定颅骨特征点。首先，对颅骨分区样本进行统计建模；利用统计模型的形变控制生成基准模型和生成模型，并建立基准模型和生成模型间的映射关系。然后，定义了模型之间相似性。最后，利用模型相似度和映射关系，间接得到待测模型的特征点。实验结果表明：该方法定位眼眶模型特征点的位置平均误差值为3.232 5 pixel；当距离阈值为10 pixel（模型大小的3%）时，有90%的特征点的位置准确率达到100%。与现有方法相比，本文方法标定的颅骨特征点的准确度和精确度都更高，并且可以标定颅骨模型平滑区域的特征点。

Abstract

A fully automatic skull feature point extraction method was proposed, which extracts the skull feature points by a partitioned statistical deformable model and a model similarity matching method.First, the statistic models of skull partition were constructed, and a benchmark model and a series of generated models were built by statistical model deformation.Then the mapping relationship between models was established and the model similarity was defined.Finally, the feature points of the model to be measured were indirectly obtained with the model similarity and the projection relationship.Experimental results indicate that the location average error of the feature points for an eye socket model is about 3.232 5 pixels.When the distance threshold is 10 pixels (3% of the size of the model), the location accuracy for 90% of the feature points achieves 100%.The method proposed has higher accuracy and exaction for skull feature point extraction as compared with traditional methods， and can extract the feature points of smooth regions for skull models.

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冯筠, 陈雨, 仝鑫龙, 贺小伟, 周明全. 三维颅骨特征点的自动标定[J]. 光学精密工程, 2014, 22(5): 1388. FENG Jun, CHEN Yu, TONG Xin-long, HE Xiao-wei, ZHOU Ming-quan. Automatic feature point extraction for three-dimensional skull[J]. Optics and Precision Engineering, 2014, 22(5): 1388.

三维颅骨特征点的自动标定

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