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Apparatus and method for generating depth image

  • US 9,310,488 B2
  • Filed: 04/20/2011
  • Issued: 04/12/2016
  • Est. Priority Date: 09/17/2010
  • Status: Active Grant
First Claim
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1. An apparatus for generating a depth image, the apparatus comprising:

  • an optical modulator which optically modulates reflective light which is reflected light from an object to which light modulated using a first pseudorandom (PN) sequence is irradiated, by use of second PN-sequences, each of which has a same PN sequence as the first PN-sequence, but the second PN-sequences having N different time shifts;

    an optical sensor which senses the optically modulated reflective light; and

    a depth image process unit which samples N intensity images from the optically modulated reflective light sensed by the optical sensor and generates a depth image of the object using the sampled N intensity images,wherein the depth image process unit individually determines respective depth extraction errors of each of a plurality of depths when the plurality of depths are determined according to a plurality of times of flight of light that are predicted using the N sampled intensity images, and selects a depth of the plurality of depths having a smallest error deviation estimate of the errors as a final depth of the depth image,wherein the depth image process unit calculates a time of flight of light that is irradiated from a light source and reaches the optical sensor based on the N sampled intensity images, andwherein when N is a number that is equal to or greater than 3, the depth image process unit determines whether an intensity image IM havin a minimum intensity among the three or more sampled intensity images is a first captured intensity image I1 or a thirdly captured intensity image I3, and calculates a depth according to the determination result.

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