Abstract: The present disclosure relates to image recognition or image searching. More precisely, the present disclosure relates to pruning local descriptors extracted from an input image. The present disclosure proposes a system, method and device directed to the pruning of local descriptors extracted from image patches of an input image. The present disclosure prunes local descriptors assigned to a codebook cell, based on a relationship of the local descriptor and the assigned codebook cell. The present disclosure includes assigning a weight value for use in pruning based on the relationship of the local descriptor and the assigned codebook cell. This weight value is then used during the encoding of the local descriptors for use in image searching or image recognition.

Abstract: A method for retrieving at least one search image matching a query image commences by first extracting a set of search images. The query image is encoded into a query image feature vector and the search images are encoded into search image feature vectors using an optimized encoding process that makes use of learned encoding parameters. The Euclidean distances between the query image feature vector and the search image feature vectors are then computed. The search images are ranked based on the computed distances; and at least one highest-ranked search image is retrieved.