Shape-based feature extraction in content-based image retrieval is an important research area at present. An algorithm is presented, based on shape features, to enhance the set of features useful in a leaf identification system.
Lakshmi, B. V. & Mohan, V. (2017). Plant leaf image detection method using a midpoint circle algorithm for shape-based feature extraction. Journal of Modern Applied Statistical Methods, 16(1), 461-480. doi: 10.22237/jmasm/1493598420