Individual identification system
AssigneeNEC Corporation
InventorsToru Takahashi, Kengo Makino, Rui Ishiyama
Life of this patent
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Abstract
An individual identification system includes an acquiring means and a determining means. The acquiring means is configured to acquire a matched image obtained by shooting part of a predetermined region of a matching target object. The determining means is configured to calculate a score representing a degree to which a partial image similar to the matched image exists in a registration image obtained by shooting a predetermined region of a registration target object, and determine based on the score whether or not the matching target object is identical to the registration target object.
Claims5
An individual identification system having a registration phase and an operation phase, the individual identification system comprising:
- a memory containing program instructions;
- and
- a processor coupled to the memory, wherein the processor is configured to execute the program instructions to:
- in the registration phrase:
- acquire a plurality of images obtained by shooting a plurality of mutually different faces of a registration target object, or a plurality of images obtained by shooting a plurality of subregions that are spatially away from each other on an identical face of the registration target object, as a plurality of first images of the registration target object;
- generate one composite image by pasting a plurality of a second images onto a background image in which a value of each pixel is a predetermined value, the plurality of the second images being the plurality of the first images or a plurality of Fourier-Mellin feature images obtained by performing Fourier-Mellin transform on the first images;
- store the generated composition image as a registration image;
- in the matching phase:
- acquire a matching image obtained by shooting part of a predetermined region of a matching target object;
- enlarge the matching image or a Fourier-Mellin feature image obtained by performing a Fourier-Mellin transform on the matching image to a same size as a size of the registration image;
- calculate a score representing a degree to which a partial image similar to the matched image exists in the registration image based on a synthesized frequency feature obtained by synthesizing a frequency feature of the enlarged matching image and a frequency feature of the registration image;
- and
- determine whether or not the matching target object is identical to the registration target object based on the score.
An individual identification method having a registration phase and an operation phase, the individual identification method performed by a computer and comprising:
- in the registration phrase:
- acquiring a plurality of images obtained by shooting a plurality of mutually different faces of a registration target object, or a plurality of images obtained by shooting a plurality of subregions that are spatially away from each other on an identical face of the registration target object, as a plurality of first images of the registration target object;
- generating one composite image by pasting a plurality of a second images onto a background image in which a value of each pixel is a predetermined value, the plurality of the second images being the plurality of the first images or a plurality of Fourier-Mellin feature images obtained by performing Fourier-Mellin transform on the first images;
- storing the generated composition image as a registration image;
- in the matching phase:
- acquiring a matching image obtained by shooting part of a predetermined region of a matching target object;
- enlarging the matching image or a Fourier-Mellin feature image obtained by performing a Fourier-Mellin transform on the matching image to a same size as a size of the registration image;
- calculating a score representing a degree to which a partial image similar to the matched image exists in the registration image based on a synthesized frequency feature obtained by synthesizing a frequency feature of the enlarged matching image and a frequency feature of the registration image;
- and
- determining whether or not the matching target object is identical to the registration target object based on the score.
A non-transitory computer-readable recording medium storing a program having a registration phase and an operation phase, the program executable by a computer to perform processing comprising:
- in the registration phrase:
- acquiring a plurality of images obtained by shooting a plurality of mutually different faces of a registration target object, or a plurality of images obtained by shooting a plurality of subregions that are spatially away from each other on an identical face of the registration target object, as a plurality of first images of the registration target object;
- generating one composite image by pasting a plurality of a second images onto a background image in which a value of each pixel is a predetermined value, the plurality of the second images being the plurality of the first images or a plurality of Fourier-Mellin feature images obtained by performing Fourier-Mellin transform on the first images;
- storing the generated composition image as a registration image;
- in the matching phase:
- acquiring a matching image obtained by shooting part of a predetermined region of a matching target object;
- enlarging the matching image or a Fourier-Mellin feature image obtained by performing a Fourier-Mellin transform on the matching image to a same size as a size of the registration image;
- calculating a score representing a degree to which a partial image similar to the matched image exists in the registration image based on a synthesized frequency feature obtained by synthesizing a frequency feature of the enlarged matching image and a frequency feature of the registration image;
- and
- determining whether or not the matching target object is identical to the registration target object based on the score.
Dependencies are inferred from the claim text.