Illumination Detection Using Classifier Chains
First Claim
Patent Images
1. A face detection method, comprising:
- (a) acquiring a digital image(b) extracting a sub-window from said image(c) applying two or more shortened face detection classifier cascades, trained to be selectively sensitive to a characteristic of a face region,(d) based on the applying, determining a probability that a face with a certain form of the characteristic is present within the sub-window;
(e) based on the determining, applying an extended face detection classifier cascade trained for sensitivity to said form of said characteristic;
(f) providing a final determination that a face exists within the image sub-window; and
(g) repeating steps (b)-(e) one or more times for one or more further sub-windows from the image or one or more further characteristics, or both.
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Abstract
A face illumination normalization method includes acquiring a digital image including a face that appears to be illuminated unevenly. One or more uneven illumination classifier programs are applied to the face data to determine the presence of the face within the digital image and/or the uneven illumination condition of the face. The uneven illumination condition may be corrected to thereby generate a corrected face image appearing to have more uniform illumination, for example, to enhance face recognition.
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Citations
36 Claims
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1. A face detection method, comprising:
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(a) acquiring a digital image (b) extracting a sub-window from said image (c) applying two or more shortened face detection classifier cascades, trained to be selectively sensitive to a characteristic of a face region, (d) based on the applying, determining a probability that a face with a certain form of the characteristic is present within the sub-window; (e) based on the determining, applying an extended face detection classifier cascade trained for sensitivity to said form of said characteristic; (f) providing a final determination that a face exists within the image sub-window; and (g) repeating steps (b)-(e) one or more times for one or more further sub-windows from the image or one or more further characteristics, or both. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An improved face detection method, comprising:
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(a) acquiring a digital image (b) extracting a sub-window from said image (c) applying two or more shortened face detection classifier cascades, trained to be selectively sensitive to directional facial illumination; (d) based on the applying, determining a probability that a face having a certain form of directional facial illumination is present within the sub-window; (e) based on the determining, applying an extended face detection classifier cascade trained for sensitivity to said form of directional face illumination; (f) providing a final determination that a face exists within the image sub-window (g) repeating steps (b)-(e) one or more times for one or more further sub-windows from the image or one or more further directional facial illuminations, or both - View Dependent Claims (9, 10, 11, 12)
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13. A digital image acquisition device including an optoelectronic system for acquiring a digital image, and a digital memory having stored therein processor-readable code for programming the processor to perform a face illumination normalization method, wherein the method comprises:
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(a) acquiring a digital image (b) extracting a sub-window from said image (c) applying two or more shortened face detection classifier cascades, trained to be selectively sensitive to a characteristic of a face region, (d) based on the applying, determining a probability that a face with a certain form of the characteristic is present within the sub-window; (e) based on the determining, applying an extended face detection classifier cascade trained for sensitivity to said form of said characteristic; (f) providing a final determination that a face exists within the image sub-window; and (g) repeating steps (b)-(e) one or more times for one or more further sub-windows from the image or one or more further characteristics, or both. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A digital image acquisition device including an optoelectronic system for acquiring a digital image, and a digital memory having stored therein processor-readable code for programming the processor to perform a face illumination normalization method, wherein the method comprises:
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(a) acquiring a digital image (b) extracting a sub-window from said image (c) applying two or more shortened face detection classifier cascades, trained to be selectively sensitive to directional facial illumination; (d) based on the applying, determining a probability that a face having a certain form of directional facial illumination is present within the sub-window; (e) based on the determining, applying an extended face detection classifier cascade trained for sensitivity to said form of directional face illumination; (f) providing a final determination that a face exists within the image sub-window (g) repeating steps (b)-(e) one or more times for one or more further sub-windows from the image or one or more further directional facial illuminations, or both - View Dependent Claims (21, 22, 23, 24)
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25. A digital memory having stored therein processor-readable code for programming the processor to perform a face illumination normalization method, wherein the method comprises:
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(a) acquiring a digital image (b) extracting a sub-window from said image (c) applying two or more shortened face detection classifier cascades, trained to be selectively sensitive to a characteristic of a face region, (d) based on the applying, determining a probability that a face with a certain form of the characteristic is present within the sub-window; (e) based on the determining, applying an extended face detection classifier cascade trained for sensitivity to said form of said characteristic; (f) providing a final determination that a face exists within the image sub-window; and (g) repeating steps (b)-(e) one or more times for one or more further sub-windows from the image or one or more further characteristics, or both. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32. A digital memory having stored therein processor-readable code for programming the processor to perform a face illumination normalization method, wherein the method comprises:
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(a) acquiring a digital image (b) extracting a sub-window from said image (c) applying two or more shortened face detection classifier cascades, trained to be selectively sensitive to directional facial illumination; (d) based on the applying, determining a probability that a face having a certain form of directional facial illumination is present within the sub-window; (e) based on the determining, applying an extended face detection classifier cascade trained for sensitivity to said form of directional face illumination; (f) providing a final determination that a face exists within the image sub-window (g) repeating steps (b)-(e) one or more times for one or more further sub-windows from the image or one or more further directional facial illuminations, or both - View Dependent Claims (33, 34, 35, 36)
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Specification