Patent ID: 11893818
Assignee: ABBYY DEVELOPMENT INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A method, comprising:
receiving, by a processing device, a first set of document images;
extracting a plurality of keypoint regions from each document image of the first set of document images;
calculating local descriptors for each keypoint region of the extracted keypoint regions;
clustering the local descriptors such that each center of a cluster of local descriptors corresponds to a respective visual word;
generating a codebook containing a set of visual words;
optimizing the codebook by maximizing mutual information (MI) between a target field of a second set of document images and at least one visual word of the set of visual words; and
detecting, using the codebook, one or more fields in a document image.