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1. (US20170017852) DETECTING DEVICE, DETECTING METHOD, AND RECORDING MEDIUM
注意: このテキストは、OCR 処理によってテキスト化されたものです。法的な用途には PDF 版をご利用ください。

Claims

1. A detecting device, comprising:
an image acquirer acquiring images in multiple different wavelength ranges of reflected light of light emitted at a person; and
a determiner determining whether luminances of a face region in the images acquired by the image acquirer satisfy specific relations different from relations exhibited by skin.
2. The detecting device according to claim 1, wherein
the determiner determines that the person is wearing a disguise when the specific relations are satisfied.
3. The detecting device according to claim 2, wherein
the image acquirer acquires multiple images in different wavelength ranges within an infrared band, and
the determiner determines that the specific relations are satisfied when a waveform presented by distribution of the luminances of the face region in the images is concave.
4. The detecting device according to claim 1, wherein
the image acquirer acquires images in wavelength ranges around 1166 nm, around 1190 nm, and around 1214 nm separately, and
the determiner determines that the specific relations are satisfied when the luminance of the face region in the image in the wavelength range around 1190 nm is lower than the luminances of the face region in the images in the wavelength ranges around 1166 nm and around 1214 nm by a given rate.
5. The detecting device according to claim 1, wherein
the image acquirer acquires images in wavelength ranges around 1166 nm, around 1190 nm, and around 1214 nm, and
the determiner determines that the specific relations are satisfied when the luminance of the face region in the image in the wavelength range around 1190 nm is lower than the luminances of the face region in the images in the wavelength ranges around 1166 nm and around 1214 nm by a given rate and the luminance within the face region in the image in the wavelength range around 1214 nm is higher than the luminance of the face region in the image in the wavelength range around 1166 nm by a given rate.
6. The detecting device according to claim 1, further comprising:
a face detector detecting a face region of the person from the images acquired by the image acquirer,
wherein the determiner determines whether the luminances of the face region detected by the face detector satisfy the specific relations.
7. The detecting device according to claim 6, wherein
the face detector detects a characteristic region from the face region, and
the determiner determines whether the luminances of the characteristic region in the images detected by the face detector satisfy specific relations.
8. The detecting device according to claim 7, wherein
the face detector detects at least one of a forehead region, right cheek region, and left cheek region as the characteristic region.
9. The detecting device according to claim 1, wherein
the image acquirer acquires the images in multiple different wavelength ranges by splitting reflected light of the light emitted at the person.
10. The detecting device according to claim 1, wherein
the image acquirer comprises:
multiple image capturers provided at different positions for each of the specific wavelength ranges and capturing images in corresponding wavelength ranges; and
an image corrector acquiring images in which the images captured by the multiple image capturers are corrected as if the person was photographed at one and the same point.
11. The detecting device according to claim 1, wherein
the determiner further comprises a notifier giving notice of the specific relations being satisfied when determined so.
12. The detecting device according to claim 1, wherein
the light emitted at the person is infrared light emitted from a halogen light source.
13. The detecting device according to claim 2, wherein
the disguise is a disguise with a silicone disguising mask.
14. A detecting method, comprising:
an image acquisition step of acquiring images in multiple different wavelength ranges of reflected light of light emitted at a person; and
a determination step of determining whether luminances of a face region in the images acquired in the image acquisition step satisfy specific relations different from relations exhibited by skin.
15. A non-transitory recording medium saving a program that allows a computer to function as:
a determiner determining whether luminances of a face region in images of a person captured in multiple different wavelength ranges satisfy specific relations different from relations exhibited by skin.