View full-text article in PMC Sensors (Basel). 2021 Apr 8;21(8):2608. doi: 10.3390/s21082608 Search in PMC Search in PubMed View in NLM Catalog Add to search Copyright and License information © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). PMC Copyright notice Algorithm 1 Multilevel registration 1:INPUT: Reference image (R) and test or moving image (M) 2:forlevel=minLevel⇒maxLeveldo 3: Mlevel⇒M 4: Rlevel⇒R 5: ylevel⇒argminJ(ylevel) 6: if Level⊣maxLevel then 7: yLevel+1⇐yLevel 8: end if 9:end for 10:y⇒ymaxLevel 11:OUTPUT: Transformation of y