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

Claim 7:
8. A system, comprising:
a memory,
a processor coupled to the memory, the processor configured to:
receive a first set of document images;
extract a plurality of keypoint regions from each document image of the first set of document images;
calculate local descriptors for each keypoint region of the extracted keypoint regions;
cluster the local descriptors such that each center of a cluster of local descriptors corresponds to a respective visual word;
generate a codebook containing a set of visual words; and
optimize 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
detect, using the codebook, one or more fields in a document image.