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
G06V30/10 Character recognition
G06V30/18 Extraction of features or characteristics of the image
G06V30/1801 Detecting partial patterns, e.g. edges or contours, or configurations, e.g. loops, corners, strokes or intersections
G06V30/18019 by matching or filtering
G06V30/18038 Biologically-inspired filters, e.g. difference of Gaussians [DoG], Gabor filters
G06V30/18048 with interaction between the responses of different filters, e.g. cortical complex cells