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US 12,183,112 B2Granted
Detecting device, detecting method, and recording medium
AssigneeNEC Corporation
InventorsLeiming Su, Mamoru Inoue, Kenta Aino, Hiroaki Morita
Life of this patent
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Abstract
A light source (11) of a disguising mask detecting device (1) emits light at a person who is a subject. A camera (12) acquires images in multiple different wavelength ranges of reflected light of the light emitted at the person. A face detector (172) detects a face region of the person from the images acquired by the camera (12). A determiner (173) determines that the person is wearing a disguising mask when luminances of the face region in the images satisfy specific relations different from relations exhibited by skin.
Claims3
A detecting device comprising:
- at least one memory configured to store instructions;
- and
- at least one processor configured to execute the instructions to perform:
- acquiring a first image of a person in a first wavelength ranges;
- acquiring a second image of the person in a second wavelength ranges being different from the first wavelength ranges;
- calculating a plurality of determination scores based on the first image and the second image;
- calculating a final score based on the plurality of determination scores;
- and
- when the final score is equal to or higher than a threshold, determining that the person is wearing a disguising mask,
- wherein the at least one processor is further configured to execute the instructions to perform:
- acquiring multiple images in different wavelength ranges including the first wavelength ranges and the second wavelength ranges within an infrared band, and
- determining that the person is wearing the disguising mask when a waveform presented by distribution of luminance of a plurality of pixels of face region in the multiple images is concave, and
- wherein the at least one processor is configured to execute the instructions to perform:
- acquiring images in wavelength ranges around 1166 nm, around 1190 nm, and around 1214 nm, and
- determining that the person is wearing the disguising mask when luminance of a plurality of pixels in the image in the wavelength range around 1190 nm is lower than luminance of a plurality of pixels in the images in the wavelength ranges around 1166 nm and around 1214 nm by a given rate and the luminance within the plurality of pixels in the image in the wavelength range around 1214 nm is higher than luminance of a plurality of pixels in the image in the wavelength range around 1166 nm by a given rate.
12 more elements
A detecting method comprising:
- acquiring a first image of a person in a first wavelength ranges;
- acquiring a second image of the person in a second wavelength ranges being different from the first wavelength ranges;
- calculating a plurality of determination scores based on the first image and the second image;
- calculating a final score based on the plurality of determination scores;
- and
- when the final score is equal to or higher than a threshold, determining that the person is wearing a disguising mask,
- wherein the detecting method further comprises:
- acquiring multiple images in different wavelength ranges including the first wavelength ranges and the second wavelength ranges within an infrared band, and
- determining that that the person is wearing the disguising mask when a waveform presented by distribution of luminance of a plurality of pixels of face region in the multiple images is concave, and
- wherein the detecting method further comprises:
- acquiring images in wavelength ranges around 1166 nm, around 1190 nm, and around 1214 nm, and
- determining that that the person is wearing the disguising mask when luminance of a plurality of pixels in the image in the wavelength range around 1190 nm is lower than luminance of a plurality of pixels in the images in the wavelength ranges around 1166 nm and around 1214 nm by a given rate and the luminance within the plurality of pixels in the image in the wavelength range around 1214 nm is higher than luminance of a plurality of pixels in the image in the wavelength range around 1166 nm by a given rate.
9 more elements
A non-transitory program recording medium that records a program causing a computer to execute processing of:
- acquiring a first image of a person in a first wavelength ranges;
- acquiring a second image of the person in a second wavelength ranges being different from the first wavelength ranges;
- calculating a plurality of determination scores based on the first image and the second image;
- calculating a final score based on the plurality of determination scores;
- and
- when the final score is equal to or higher than a threshold, determining that the person is wearing a disguising mask,
- wherein the program causes the computer to execute further processing of:
- acquiring multiple images in different wavelength ranges including the first wavelength ranges and the second wavelength ranges within an infrared band, and
- determining that that the person is wearing the disguising mask when a waveform presented by distribution of luminance of a plurality of pixels of face region in the multiple images is concave, and
- wherein the program causes the computer to execute further processing of:
- acquiring images in wavelength ranges around 1166 nm, around 1190 nm, and around 1214 nm, and
- determining that that the person is wearing the disguising mask when luminance of a plurality of pixels in the image in the wavelength range around 1190 nm is lower than luminance of a plurality of pixels in the images in the wavelength ranges around 1166 nm and around 1214 nm by a given rate and the luminance within the plurality of pixels in the image in the wavelength range around 1214 nm is higher than luminance of a plurality of pixels in the image in the wavelength range around 1166 nm by a given rate.
9 more elements
Dependencies are inferred from the claim text.