G PHYSICS
G06 COMPUTING; CALCULATING OR COUNTING
G06V IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
G06V10/00 Arrangements for image or video recognition or understanding
G06V10/20 Image preprocessing
G06V10/26 Segmentation of patterns in the image field; Cutting or merging of image elements to establish the pattern region, e.g. clustering-based techniques; Detection of occlusion