Facial expression recognition apparatus, image sensing apparatus, facial expression recognition method, and computer-readable storage medium
First Claim
Patent Images
1. An apparatus comprising:
- an image input unit configured to input an image;
a face detection unit configured to detect a face image of a person from the image input by said image input unit;
a first calculation unit configured to calculate a first expression evaluation value corresponding to a first facial expression for the detected face based on the face image detected by said face detection unit;
a second calculation unit configured to calculate a second expression evaluation value corresponding to a second facial expression for the detected face based on the face image detected by said face detection unit, wherein the second facial expression is different from the first facial expression;
an updating unit configured to update, based on the first expression value, a relationship between the second expression value and a threshold value for determining a facial expression of a person; and
a judgment unit configured to judge whether the detected face shows the second facial expression or not based on the relationship between the second expression value and the threshold value which is updated by said updating unit.
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Abstract
A facial expression recognition apparatus (10) detects a face image of a person from an input image, calculates a facial expression evaluation value corresponding to each facial expression from the detected face image, updates, based on the face image, the relationship between the calculated facial expression evaluation value and a threshold for determining a facial expression set for the facial expression evaluation value, and determines the facial expression of the face image based on the updated relationship between the facial expression evaluation value and the threshold for determining a facial expression.
10 Citations
17 Claims
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1. An apparatus comprising:
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an image input unit configured to input an image; a face detection unit configured to detect a face image of a person from the image input by said image input unit; a first calculation unit configured to calculate a first expression evaluation value corresponding to a first facial expression for the detected face based on the face image detected by said face detection unit; a second calculation unit configured to calculate a second expression evaluation value corresponding to a second facial expression for the detected face based on the face image detected by said face detection unit, wherein the second facial expression is different from the first facial expression; an updating unit configured to update, based on the first expression value, a relationship between the second expression value and a threshold value for determining a facial expression of a person; and a judgment unit configured to judge whether the detected face shows the second facial expression or not based on the relationship between the second expression value and the threshold value which is updated by said updating unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 17)
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11. An apparatus comprising:
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an image input unit configured to input an image; a face detection unit configured to detect a face image of a person from the image input by said image input unit; a first calculation unit configured to calculate a first expression evaluation value corresponding to a first facial expression for the detected face based on the face image detected by said face detection unit; a second calculation unit configured to calculate a second expression evaluation value corresponding to a second facial expression for the detected face based on the face image detected by said face detection unit, wherein the second facial expression is different from the first facial expression; a facial expression history obtaining unit configured to obtain a facial expression history; an updating unit configured to update a relationship between the second expression value and a threshold value for determining a facial expression of a person, wherein said updating unit updates the relationship between the second expression value and the threshold value based on the obtained facial expression history; and a judgment unit configured to judge whether the detected face shows the second facial expression or not based on the relationship between the second expression value and the threshold value which is updated by said updating unit.
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12. An apparatus comprising:
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an image input unit configured to input an image; a face detection unit configured to detect a face image of a person from the image input by said image input unit; a first calculation unit configured to calculate a first expression evaluation value corresponding to a first facial expression for the detected face based on the face image detected by said face detection unit; a second calculation unit configured to calculate a second expression evaluation value corresponding to a second facial expression for the detected face based on the face image detected by said face detection unit, wherein the second facial expression is different from the first facial expression; an age estimation unit configured to estimate an age of a person whose face is detected by said face detection unit; an updating unit configured to update a relationship between the second expression value and a threshold value for determining a facial expression of a person, wherein said updating unit updates the relationship between the second expression value and the threshold value based on the age estimated by said age estimation unit; and a judgment unit configured to judge whether the detected face shows the second facial expression or not based on the relationship between the second expression value and the threshold value which is updated by said updating unit.
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13. An apparatus comprising:
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an image input unit configured to input an image; a face detection unit configured to detect a face image of a person from the image input by said image input unit; a first calculation unit configured to calculate a first expression evaluation value corresponding to a first facial expression for the detected face based on the face image detected by said face detection unit; a second calculation unit configured to calculate a second expression evaluation value corresponding to a second facial expression for the detected face based on the face image detected by said face detection unit, wherein the second facial expression is different from the first facial expression; a sex estimation unit configured to estimate a sex of a person whose face is detected by said face detection unit; an updating unit configured to update a relationship between the second expression value and a threshold value for determining a facial expression of a person, wherein said updating unit updates the relationship between the second expression value and the threshold value based on the sex estimated by said sex estimation unit; and a judgment unit configured to judge whether the detected face shows the second facial expression or not based on the relationship between the second expression value and the threshold value which is updated by said updating unit.
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14. A method comprising:
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an image input step of inputting an image; a face detection step of detecting a face image of a person from the image input in the image input step; a first calculation step of calculating a first expression evaluation value corresponding to a first facial expression for the detected face based on the face image detected in the face detection step; a second calculation step of calculating a second expression value corresponding to a second facial expression for the detected face based on the face image detected in the face detection step, wherein the second facial expression is different from the first facial expression; an updating step of updating, based on the first expression value, a relationship between the second expression value and a threshold value for determining a facial expression of a person; and a judgment step of judging whether the detected face shows the second facial expression or not based on the relationship between the second expression value and the threshold value which is updated in the updating step. - View Dependent Claims (15, 16)
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Specification