Contour Extraction based on Circular Hough Transform for Forest Canopy Digital Hemispherical Photography
Liangkuan Zhu, Liang Liu, Weipeng Jing, and Jianping Huang
Int J Performability Eng . 2018, (1): 48 -56 .  DOI: 10.23940/ijpe.18.01.p6.4856