Patent ID: 9361535
Filing Date: 2016-06-07
CPC Classification: G06K,G08G

Claim Text:
1. A method for reading license plate numbers by means of optical character recognition (OCR) in a road network, comprising: in a first OCR reading process, recording a first image of a license plate number at a first location in the road network, OCR-reading a first license plate character string in the first image recording, and storing a first OCR data set including the first license plate number image recording, the first license plate number character string and at least one first confidence measure of the first OCR reading process, as a stored OCR data set in a database; in a second OCR reading process, recording a second image of a license plate number at a second location in the road network, OCR-reading a second license plate number character string in the second image recording, and generating a second OCR data set including the second license plate number image recording, the second license plate number character string and at least one second confidence measure of the second OCR reading process, as a current OCR data set; and, if at least one confidence measure of the current OCR data set falls below a first minimum confidence value, selecting at least one stored OCR data set from the database, the license plate number image recording of which selected stored OCR data set has a similarity that exceeds a minimum similarity value and/or has the greatest respective similarity to the license plate number image recording of the current OCR data set, and using the at least one selected OCR data set for improving the license plate number character string of the current OCR data set.