US Patent 10346464 Cross-modiality image matching method

A computer-implementable method for determining a score for matching images includes extracting and determining. Features are extracted from each of a query image acquired in a first modality and a database image acquired in a second modality. A vector distance distribution is determined based on a codebook for the first modality for each of the query image and the database image represented by the extracted features. The method determines a set of distances between the vector distance distribution determined for the query image and the vector distance distribution determined for the database image. The score for matching the query image and the database image is determined based on the determined set of distances.