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Background extraction in a video picture

  • US 5,940,139 A
  • Filed: 10/01/1996
  • Issued: 08/17/1999
  • Est. Priority Date: 08/07/1996
  • Status: Expired due to Fees
First Claim
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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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