In this paper, an approach is described for recognizing and locating partially hidden objects in an image. In the approach, templates are formed from the edge contours of the objects sought. Segments of each template are matched to segments of the edge contours of the image. A Bayesian approach is used to decide the probability an object has been located given that matches occur.
J. L. Turney,
T. N. Mudge,
R. A. Volz,
"Recognizing Partially Hidden Objects", Proc. SPIE 0521, Intelligent Robots and Computer Vision, (17 January 1985); doi: 10.1117/12.946169; https://doi.org/10.1117/12.946169