Fig. 3
From: An automated method for stem diameter measurement based on laser module and deep learning
Diagram of circular structural elements in the spot detection algorithm (SDA) and their variation in the coordinate system. The gray is uneven light, the yellow represents the spot and the black is the disturbing factor. a The original image and its coordinate system. b The original image and coordinate system after opening operation. c Cropped image and coordinate system. d Spot position image and coordinate system