G PHYSICS
G06 COMPUTING OR CALCULATING; COUNTING
G06V IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
30/00 Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
G06V30/40 Document-oriented image-based pattern recognition
G06V30/41 Analysis of document content
G06V30/414 Extracting the geometrical structure, e.g. layout tree; Block segmentation, e.g. bounding boxes for graphics or text