Face detection method, device and program
First Claim
1. A face detection method comprising:
- a face candidate extracting step for extracting face image candidates by changing position, inclination and orientation of a face to be detected in an inputted image, calculating, for each of the position, inclination and orientation of the face to be detected, an indicator value indicating a probability of a partial image at the position being a face image containing a face having the inclination and the orientation, and extracting all the partial images having the indicator values not less than a first threshold value as face image candidates; and
a discriminating step for discriminating whether or not the face image candidates are true face images,wherein, when a predetermined evaluation value indicating reliability of a certain face image candidate, among the face image candidates, having a predetermined inclination and a first orientation of the face is not less than a predetermined threshold value, the discriminating step discriminates another face image candidate, among the face image candidates, having substantially the same inclination as the predetermined inclination and a second orientation of the face as being a true face image.
1 Assignment
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Accused Products
Abstract
To detect faces contained in an image with changing position, inclination and orientation of a face to be detected, an indicator value for each position, inclination and orientation is calculated, which indicates probability of a partial image at the position being a face image having the inclination and the orientation. Then, the partial images having the indicator values not less than a first threshold are extracted as candidates. When a predetermined evaluation value indicating reliability of a certain candidate having a predetermined inclination and a first orientation is not less than a predetermined threshold value, another candidate having the predetermined inclination and a second orientation is discriminated as being a true face. When the candidates having the indicator values not less than a second threshold are discriminated as being true faces, the second threshold is lowered for another candidate having the predetermined inclination and a second orientation for discrimination.
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Citations
26 Claims
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1. A face detection method comprising:
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a face candidate extracting step for extracting face image candidates by changing position, inclination and orientation of a face to be detected in an inputted image, calculating, for each of the position, inclination and orientation of the face to be detected, an indicator value indicating a probability of a partial image at the position being a face image containing a face having the inclination and the orientation, and extracting all the partial images having the indicator values not less than a first threshold value as face image candidates; and a discriminating step for discriminating whether or not the face image candidates are true face images, wherein, when a predetermined evaluation value indicating reliability of a certain face image candidate, among the face image candidates, having a predetermined inclination and a first orientation of the face is not less than a predetermined threshold value, the discriminating step discriminates another face image candidate, among the face image candidates, having substantially the same inclination as the predetermined inclination and a second orientation of the face as being a true face image. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A face detection method comprising:
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a face candidate extracting step for extracting face candidates by changing position, inclination and orientation of a face to be detected in an inputted image, calculating, for each of the position, inclination and orientation of the face to be detected, an indicator value indicating a probability of a partial image at the position being a face image containing a face having the inclination and the orientation, and extracting all the partial images having the indicator values not less than a first threshold value as face image candidates; and a discriminating step for discriminating whether or not the face image candidates are true face images, wherein the discriminating step discriminates the face image candidates having the calculated indicator values not less than a second threshold value as being true face images from all the other extracted face image candidates, and when a predetermined evaluation value indicating reliability of a certain face image candidate, among the face image candidates, having a predetermined inclination and a first orientation of the face is not less than a predetermined threshold value, the discriminating step lowers the second threshold value for discrimination of another face image candidate, among the face image candidates, having substantially the same inclination as the predetermined inclination and a second orientation of the face. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A face detection device comprising:
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a face candidate extracting means for extracting face image candidates by changing position, inclination and orientation of a face to be detected in an inputted image, calculating, for each of the position, inclination and orientation of the face to be detected, an indicator value indicating a probability of a partial image at the position being a face image containing a face having the inclination and the orientation, and extracting all the partial images having the indicator values not less than a first threshold value as face image candidates; and a discriminating means for discriminating whether or not the face image candidates are true face images, wherein, when a predetermined evaluation value indicating reliability of a certain face image candidate, among the face image candidates, having a predetermined inclination and a first orientation of the face is not less than a predetermined threshold value, the discriminating means discriminates another face image candidate, among the face image candidates, having substantially the same inclination as the predetermined inclination and a second orientation of the face as being a true face image. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A face detection device comprising:
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a face candidate extracting means for extracting face image candidates by changing position, inclination and orientation of a face to be detected in an inputted image, calculating, for each of the position, inclination and orientation of the face to be detected, an indicator value indicating a probability of a partial image at the position being a face image containing a face having the inclination and the orientation, and extracting all the partial images having the indicator values not less than a first threshold value as face image candidates; and a discriminating means for discriminating whether or not the face image candidates are true face images, wherein the discriminating means discriminates the face image candidates having the calculated indicator values not less than a second threshold value as being true face images from all the other extracted face image candidates, and when a predetermined evaluation value indicating reliability of a certain face image candidate, among the face image candidates, having a predetermined inclination and a first orientation of the face is not less than a predetermined threshold value, the discriminating means lowers the second threshold value for discrimination of another face image candidate, among the face image candidates, having substantially the same inclination as the predetermined inclination and a second orientation of the face. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A program for causing a computer to operate as a face detection device by causing the computer to operate as:
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a face candidate extracting means for extracting face image candidates by changing position, inclination and orientation of a face to be detected in an inputted image, calculating, for each of the position, inclination and orientation of the face to be detected, an indicator value indicating a probability of a partial image at the position being a face image containing a face having the inclination and the orientation, and extracting all the partial images having the indicator values not less than a first threshold value as face image candidates; and a discriminating means for discriminating whether or not the face image candidates are true face images, wherein, when a predetermined evaluation value indicating reliability of a certain face image candidate, among the face image candidates, having a predetermined inclination and a first orientation of the face is not less than a predetermined threshold value, the discriminating means discriminates another face image candidate, among the face image candidates, having substantially the same inclination as the predetermined inclination and a second orientation of the face as being a true face image.
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26. A program for causing a computer to operate as a face detection device by causing the computer to operate as:
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a face candidate extracting means for extracting face image candidates by changing position, inclination and orientation of a face to be detected in an inputted image, calculating, for each of the position, inclination and orientation of the face to be detected, an indicator value indicating a probability of a partial image at the position being a face image containing a face having the inclination and the orientation, and extracting all the partial images having the indicator values not less than a first threshold value as face image candidates; and a discriminating means for discriminating whether or not the face image candidates are true face images, wherein the discriminating means discriminates the face image candidates having the calculated indicator values not less than a second threshold value as being true face images from all the other extracted face image candidates, and when a predetermined evaluation value indicating reliability of a certain face image candidate, among the face image candidates, having a predetermined inclination and a first orientation of the face is not less than a predetermined threshold value, the discriminating means lowers the second threshold value for discrimination of another face image candidate, among the face image candidates, having substantially the same inclination as the predetermined inclination and a second orientation of the face.
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Specification