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Depth information for auto focus using two pictures and two-dimensional Gaussian scale space theory

  • US 7,929,801 B2
  • Filed: 08/15/2005
  • Issued: 04/19/2011
  • Est. Priority Date: 08/15/2005
  • Status: Expired due to Fees
First Claim
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1. A computerized method comprising:

  • generating two two-dimensional scale space representations from two different pictures of a three dimensional spatial scene, wherein the three dimensional spatial scene comprises a plurality of objects at different distances, each of the two-dimensional scale space representations comprises a plurality of pictures, and each of the plurality of pictures included in the respective scale space representation has a resolution that is the same as a resolution of a different picture corresponding to one of the two-dimensional scale space representation;

    computing, with an imaging system, a relative blur between the two different pictures using the two two-dimensional scale space representations, wherein the computing the relative blur further includes matching, based on blur comparisons, each block from a first picture of the two pictures to a closest corresponding block in the two-dimensional scale space representation corresponding to the second picture of the two pictures; and

    computing a picture depth map based on the relative blur, wherein an entry in the picture depth map has a corresponding entry in a blur map and the picture depth map is subsequently used to determine values for the different distances of the plurality of objects.

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