Tomographic image reconstruction using training images

详细信息    查看全文

• 作者：Sara Soltani^a ; ^{sara.soltani@fingerprints.com" class="auth_mail" title="E-mail the corresponding author} ; Martin S. Andersen^b ; ^{mskan@dtu.dk" class="auth_mail" title="E-mail the corresponding author} ; Per Christian Hansen^b ; ^{pcha@dtu.dk" class="auth_mail" title="E-mail the corresponding author}
• 关键词：primary ; 65F22 ; secondary ; 65K10
• 刊名：Journal of Computational and Applied Mathematics
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：313
• 期：Complete
• 页码：243-258
• 全文大小：4579 K

文摘

We describe and examine an algorithm for tomographic image reconstruction where prior knowledge about the solution is available in the form of training images. We first construct a non-negative dictionary based on prototype elements from the training images; this problem is formulated within the framework of sparse learning as a regularized non-negative matrix factorization. Incorporating the dictionary as a prior in a convex reconstruction problem, we then find an approximate solution with a sparse representation in the dictionary. The dictionary is applied to non-overlapping patches of the image, which reduces the computational complexity compared to previous formulations. Computational experiments clarify the choice and interplay of the model parameters and the regularization parameters, and we show that in few-projection low-dose settings our algorithm is competitive with total variation regularization and tends to include more texture and more correct edges.