Identifying and redressing shadows in connection with digital watermarking and fingerprinting
First Claim
1. A method comprising:
- identifying a shadow cast by a smartphone or camera on a subject being imaged; and
using a programmed electronic processor, redressing the shadow in connection with;
i) reading a digital watermark from imagery captured of the subject, or ii) calculating a fingerprint from the imagery captured of the subject, in which said redressing the shadow comprises disregarding image content associated with the shadow when reading the digital watermark or calculating a fingerprint.
1 Assignment
0 Petitions
Accused Products
Abstract
The present disclosure relates generally to cell phones and cameras, and to shadow detection in images captured by such cell phones and cameras. One claim recites a method comprising: identifying a shadow cast by a camera on a subject being imaged; and using a programmed electronic processor, redressing the shadow in connection with: i) reading a digital watermark from imagery captured of the subject, or ii) calculating a fingerprint from the imagery captured of the subject. Another claim recites a method comprising: identifying a shadow cast by a cell phone on a subject being imaged by a camera included in the cell phone; and using a programmed electronic processor, determining a proximity of the camera to the subject based on an analysis of the shadow. Of course, other claims and combinations are provided too.
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Citations
21 Claims
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1. A method comprising:
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identifying a shadow cast by a smartphone or camera on a subject being imaged; and using a programmed electronic processor, redressing the shadow in connection with;
i) reading a digital watermark from imagery captured of the subject, or ii) calculating a fingerprint from the imagery captured of the subject, in which said redressing the shadow comprises disregarding image content associated with the shadow when reading the digital watermark or calculating a fingerprint. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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identifying a shadow cast by a smartphone or camera on a subject being imaged, in which said identifying locates candidate edges, and in which candidate edges once identified in image data are matched against a series of reference templates, in which candidate edges once identified in image data are matched against a series of reference templates; and using a programmed electronic processor, redressing the shadow in connection with;
i) reading a digital watermark from imagery captured of the subject, or ii) calculating a fingerprint from the imagery captured of the subject. - View Dependent Claims (10)
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11. A method comprising:
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identifying a shadow cast by a smartphone or camera on a subject being imaged, in which said act of identifying a shadow compares an image frame captured without a strobe flash with an image frame captured with a strobe flash to identify the shadow; and using a programmed electronic processor, redressing the shadow in connection with;
i) reading a digital watermark from imagery captured of the subject, or ii) calculating a fingerprint from the imagery captured of the subject.
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12. A method comprising:
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identifying a shadow cast by a smartphone or camera on a subject being imaged; and using a programmed electronic processor, redressing the shadow in connection with;
i) reading a digital watermark from imagery captured of the subject, or ii) calculating a fingerprint from the imagery captured of the subject, in which said act of redressing the shadow comprises ranking candidate pixel or image regions for submission to a watermark detector or to a fingerprint analyzer, and in which shadowed regions are ranked relatively lower than un-shadowed regions.
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13. A method comprising:
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identifying a shadow cast by a smartphone or camera on a subject being imaged; and using a programmed electronic processor, redressing the shadow in connection with;
i) reading a digital watermark from imagery captured of the subject, or ii) calculating a fingerprint from the imagery captured of the subject, in which said act of redressing the shadow comprises discerning information about two lighting sources.
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14. A cell phone comprising:
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a camera for capturing imagery; memory for buffering captured imagery; and an electronic processor programmed for; identifying a shadow cast by the cell phone on a subject being imaged by said camera; and redressing the shadow in connection with;
i) reading a digital watermark from imagery captured of the subject, or ii) calculating a fingerprint from the imagery captured of the subject, in which said redressing the shadow comprises disregarding image content associated with the shadow when reading the digital watermark or calculating a fingerprint. - View Dependent Claims (15)
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16. A cell phone comprising:
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a camera for capturing imagery; memory for buffering captured imagery; and an electronic processor programmed for; identifying a shadow cast by the cell phone on a subject being imaged by said camera, in which said identifying locates candidate edges, in which candidate edges once identified in image data are matched against a series of reference templates; and redressing the shadow in connection with;
i) reading a digital watermark from imagery captured of the subject, or ii) calculating a fingerprint from the imagery captured of the subject. - View Dependent Claims (17)
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18. A cell phone comprising:
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a camera for capturing imagery; memory for buffering captured imagery; and an electronic processor programmed for; identifying a shadow cast by the cell phone on a subject being imaged by said camera, in which said identifying a shadow compares an image frame captured without a strobe flash with an image frame captured with a strobe flash to identify the shadow; and redressing the shadow in connection with;
i) reading a digital watermark from imagery captured of the subject, or ii) calculating a fingerprint from the imagery captured of the subject.
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19. A cell phone comprising:
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a camera for capturing imagery; memory for buffering captured imagery; and an electronic processor programmed for; identifying a shadow cast by the cell phone on a subject being imaged by said camera, in which said identifying a shadow analyzes an apparent position of the subject relative to a suspected shadow over two or more image frames; and redressing the shadow in connection with;
i) reading a digital watermark from imagery captured of the subject, or ii) calculating a fingerprint from the imagery captured of the subject.
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20. A cell phone comprising:
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a camera for capturing imagery; memory for buffering captured imagery; and an electronic processor programmed for; identifying a shadow cast by the cell phone on a subject being imaged by said camera; and redressing the shadow in connection with;
i) reading a digital watermark from imagery captured of the subject, or ii) calculating a fingerprint from the imagery captured of the subject, in which said redressing the shadow comprises ranking candidate pixel or image regions for submission to a watermark detector or to a fingerprint analyzer, and in which shadowed regions are ranked relatively lower than un-shadowed regions.
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21. A cell phone comprising:
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a camera for capturing imagery; memory for buffering captured imagery; and an electronic processor programmed for; identifying a shadow cast by the cell phone on a subject being imaged by said camera; and redressing the shadow in connection with;
i) reading a digital watermark from imagery captured of the subject, or ii) calculating a fingerprint from the imagery captured of the subject, in which said redressing the shadow comprises discerning information about two lighting sources.
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Specification