Background extraction in a video picture
First Claim
1. A method for object extraction in a video picture, comprising the steps of:
- a. illuminating a first object with light having a first wavelength spectrum;
b. illuminating a second object with the first wavelength spectrum light and a light having a second wavelength spectrum, the first and second wavelength spectra being different;
c. taking a video image of the first and second objects using a first wavelength spectrum light sensor and a second wavelength spectrum light sensor;
d. using an output of the second wavelength spectrum light sensor as a mask, extracting from the video image of the first wavelength light spectrum sensor one of the first and the second objects and retaining the other one of the first and the second objects;
e. providing a third video image.; and
f. after the step of extracting, combining a video image of the retained object and the third video image.
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Accused Products
Abstract
A novel video object extraction has a first object 12, such as a foreground object, illuminated with visible light 16 and a second object 14, such as a background object, illuminated with a combination of infrared 18 and visible light 16. A novel camera system observes the scene. The novel camera system includes an infrared light camera 24 and a visible light camera 20. The infrared light camera output 24 contains bright images of the second object 14, with relatively little brightness of the first object 12. The signal from this infrared light camera 20, once thresholded, serves as a key to remove the second object 14 from the video image captured by the visible light camera 20.
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Citations
24 Claims
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1. A method for object extraction in a video picture, comprising the steps of:
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a. illuminating a first object with light having a first wavelength spectrum; b. illuminating a second object with the first wavelength spectrum light and a light having a second wavelength spectrum, the first and second wavelength spectra being different; c. taking a video image of the first and second objects using a first wavelength spectrum light sensor and a second wavelength spectrum light sensor; d. using an output of the second wavelength spectrum light sensor as a mask, extracting from the video image of the first wavelength light spectrum sensor one of the first and the second objects and retaining the other one of the first and the second objects; e. providing a third video image.; and f. after the step of extracting, combining a video image of the retained object and the third video image. - View Dependent Claims (9)
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2. A method for object extraction in a video picture, comprising the steps of:
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a. illuminating a first object with light having a first wavelength spectrum; b. illuminating a second object with the first wavelength spectrum light and a light having a second wavelength spectrum, the first and second wavelength spectra being different; c. taking a video image of the first and second objects using a first wavelength spectrum light sensor and a second wavelength spectrum light sensor; d. using an output of the second wavelength spectrum light sensor as a mask, extracting from the video image of the first wavelength light spectrum sensor one of the first and the second objects and retaining the other one of the first and the second objects;
the method further comprising after the step of taking a video image of the first and second objects using the second wavelength spectrum light sensor;e. thresholding the output of the second wavelength spectrum light sensor; and f. using the thresholded output as the mask. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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10. A video object extraction system, comprising:
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a. a first wavelength spectrum light sensor configured to take a video image of a scene including an object; b. a second wavelength light spectrum source configured to illuminate the object; c. a second wavelength spectrum light sensor configured to take a video image of the scene including the object; d. a comparator connected to receive an output of the second wavelength spectrum light sensor and to output a mask signal corresponding to detection of second wavelength spectrum light in the scene; and e. a video gate connected to receive the mask signal and an output of the first wavelength spectrum light sensor and to selectively connect the output of the first wavelength spectrum light sensor to an output of the video gate in response to the mask signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification