“…Then, an expectation-maximization (EM) algorithm is applied to perform this ML optimization. Many algorithms were proposed to extend the CPD method [ 1 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 ]. These algorithms can be summarized as follows: - Selecting a suitable non-rigid transformation function: In the CPD method, only one non-rigid transformation function is considered.
…”