Face detection device, face pose detection device, partial image extraction device, and methods for said devices
First Claim
Patent Images
1. A face detection device comprising:
- a face learning dictionary for holding learned information for identification between a facial image and a non-facial image;
an image input unit operable to input a subject image;
an edge image extraction unit operable to extract an edge image from said subject image;
a partial image extraction unit operable to extract, based on said edge image, partial images that are candidates to contain facial images from said subject image;
a face/non-face identification unit operable to reference said learning dictionary and identifies whether or not each extracted partial image contains a facial image,wherein the partial image extraction unit is configured to determine a contour that joins upper end parts of the edge image and further configured to extract partial images from the subject image based on peaks and valleys of the contour.
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Abstract
A face detection device includes a face learning dictionary, which holds learned information for identification between a facial image and a non-facial image. An image input unit inputs a subject image. An edge image extraction unit extracts an edge image from the subject image. A partial image extraction unit, based on the edge image, extracts partial images that are candidates to contain facial images from the subject image. A face/non-face identification unit references the learning dictionary to identify whether or not each extracted partial image contains a facial image. Face detection of high precision, which reflects learned results, is performed.
70 Citations
23 Claims
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1. A face detection device comprising:
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a face learning dictionary for holding learned information for identification between a facial image and a non-facial image; an image input unit operable to input a subject image; an edge image extraction unit operable to extract an edge image from said subject image; a partial image extraction unit operable to extract, based on said edge image, partial images that are candidates to contain facial images from said subject image; a face/non-face identification unit operable to reference said learning dictionary and identifies whether or not each extracted partial image contains a facial image, wherein the partial image extraction unit is configured to determine a contour that joins upper end parts of the edge image and further configured to extract partial images from the subject image based on peaks and valleys of the contour. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 22)
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9. A face pose detection device comprising:
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a face learning dictionary, which holds learned information for identification between a facial image and a non-facial image; an image input unit operable to input a subject image; an edge image extraction unit operable to extract an edge image from said subject image; a partial image extraction unit operable to extract, based on said edge image, partial images that are candidates to contain facial images from said subject image; a face pose learning dictionary, which holds learned information on a plurality of predefined face poses according to each face pose; an evaluation function value calculation unit operable to calculate evaluation function values for all predefined face poses based on said learned information on said face poses and said extracted partial images; and a face pose calculation unit operable to determine said face pose based on said plurality of evaluation function values that have been calculated, including a face pose that is intermediate among said predefined face poses, wherein the partial image extraction unit is configured to determine a contour that joins upper end parts of the edge image and further configured to extract partial images from the subject image based on peaks and valleys of the contour. - View Dependent Claims (10)
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11. A partial image extraction device comprising:
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an image input unit operable to input a subject image; an edge image extraction unit operable to extract an edge image from said subject image; a partial image extraction operable to extract, based on said edge image, partial images that are considered to contain facial images from said subject image; and said partial image extraction unit is configured to determine a contour that joins upper end parts of the edge image and further configured to extract partial images from said subject image based on peaks and valleys of the contour.
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12. A face detection method comprising:
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inputting a subject image; extracting an edge image is extracted from said subject image; based on said edge image, extracting partial images from said subject image that are candidates to contain facial images; referencing a face learning dictionary that holds learned information for identification between a facial image and a non-facial image to determine whether or not each extracted partial image contains a facial image; determining a contour that joins upper end parts of said edge image; and extracting partial images from said subject image based on peaks and valleys of said contour. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 23)
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20. A face pose detection method comprising the steps of:
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inputting a subject image; extracting an edge image from said subject image; determining a contour that joins upper end parts of said edge image; extracting partial images from said edge image that are candidates to contain facial images based on peaks and valleys of said contour; calculating an evaluation function value, which includes referencing a face pose learning dictionary, which holds learned information on a plurality of predefined face poses according to each face pose; the step of calculating includes calculating said evaluation function values for all predefined face poses based on said learned information on said face poses and said extracted partial images; and calculating a face pose, based on said plurality of evaluation function values that have been calculated, said face pose, including determining a face pose that is intermediate among said predefined face poses. - View Dependent Claims (21)
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Specification