Image signature extraction device
AssigneeNEC Corporation
InventorsKota Iwamoto, Ryoma Oami
Life of this patent
Estimating the term…
Abstract
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.
Claims27
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.
An image signature extraction method, comprising:
- acquiring a first extraction region and a second extraction region associated with each dimension, among a plurality of dimensions;
- calculating a first region feature associated with the first extraction region and a second region feature associated with the second extraction region;
- calculating a difference value between the first region feature and the second region feature;
- determining a threshold for quantization boundary based on a predetermined percentile rank in a distribution of the difference values of the plurality of dimensions;
- and
- quantizing the difference value of each of the dimensions based on the threshold.
A non-transitory computer-readable medium storing a program comprising instructions for causing a computer to function as:
- a calculation unit that acquires a first and a second extraction regions 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 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.
Dependencies are inferred from the claim text.