Image signature extraction device

摘要

The image signature extraction device includes an extraction unit and a generation unit. The extraction unit extracts region features from respective sub-regions in an image in accordance with a plurality of pairs of sub-regions in the image, the pairs of sub-regions including at least one pair of sub-regions in which both a combination of shapes of two sub-regions of the pair and a relative position between the two sub-regions of the pair differ from those of at least one of other pairs of sub-regions. The generation unit generates, based on the extracted region features of the respective sub-regions, an image signature to be used for identifying the image.

主权项

1. An image signature extraction device, comprising:
a calculation unit that acquires a first extraction region and a second extraction region associated with each dimension, among a plurality of dimensions, calculates a first region feature associated with the first extraction region and a second region feature associated with the second extraction region, and calculates a difference value between the first region feature and the second region feature; a determination unit that determines a threshold for a quantization boundary based on a predetermined percentile rank in a distribution of the difference values of the plurality of dimensions; and a quantization unit that quantizes the difference value of each of the dimensions based on the threshold.