Digital camera with face detection function for facilitating exposure compensation
First Claim
Patent Images
1. A digital camera comprising:
- a face detection means for detecting a face from an input image signal defining a subject being photographed, the face detection means extracting a facial region including the face of the subject and an upper body region of the subject;
an automatic exposure detection means for calculating a brightness appraisal amount according to a facial region brightness and an upper body region brightness; and
a processing means for calculating an exposure amount to adjust the input image signal according to the brightness appraisal amount.
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Abstract
A camera is provided that includes a face detection means, an AE&AWB detection circuit, and a processor. The face detection means detects a face from an input image signal and extracts a facial region comprising the face and an upper body region. The AE&AWB detection circuit calculates a brightness appraisal amount on the basis of brightness of the facial region and the upper body region extracted by the face detection circuit. The processor calculates an exposure amount on the basis of the brightness appraisal amount calculated by the AE&AWB detection circuit.
29 Citations
18 Claims
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1. A digital camera comprising:
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a face detection means for detecting a face from an input image signal defining a subject being photographed, the face detection means extracting a facial region including the face of the subject and an upper body region of the subject; an automatic exposure detection means for calculating a brightness appraisal amount according to a facial region brightness and an upper body region brightness; and a processing means for calculating an exposure amount to adjust the input image signal according to the brightness appraisal amount. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A digital camera comprising:
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a flash; a face detection module that detects a face from an input image signal and defines an upper body region of a human subject and a facial region of the human subject; an automatic exposure detection module that calculates a brightness appraisal amount according to a brightness of the facial region and a brightness of the upper body region; and a processor in communication with the face detection module and the automatic exposure detection module, wherein the processor adjusts at least one of a flash intensity, a flash duration, a white balance of the input image signal and an exposure of the input image signal based on the brightness appraisal amount. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for compensating exposure of a photographic image of a human subject captured by a digital camera with a face detecting means, the method comprising:
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processing the photographic image to detect a face of the human subject; defining a face region; defining an upper body region; extracting first attributes relative to the face region; extracting second attributes relative to the upper body region; determining an average brightness of the face region relative to the first attributes; determining an average brightness of the upper body region relative to the second attributes; calculating a brightness appraisal amount according to the average brightness of the face region and the average brightness of the upper body region; adjusting at least one of an exposure or light intensity or duration of the photographing image according to the brightness appraisal amount; determining at least a gain for the red component and a gain for the blue component of each pixel; adjusting a white balance of the photographing image according to the gain for the red component and the gain for the blue component of each pixel. - View Dependent Claims (16, 17, 18)
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Specification