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Method and system for correcting projective distortions with elimination steps on multiple levels

  • US 8,811,751 B1
  • Filed: 12/20/2013
  • Issued: 08/19/2014
  • Est. Priority Date: 12/20/2013
  • Status: Active Grant
First Claim
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1. A method for projective correction of an image containing at least one text portion that is distorted by perspective, the method comprising the steps of:

  • image binarization, wherein said image is binarized;

    connected component analysis, wherein pixel blobs are detected in said at least one text portion of said binarized image and wherein for each of said pixel blobs a position determining pixel is selected on a pixel blob baseline of the pixel blob, said position determining pixel defining the position of the pixel blob in the binarized image;

    horizontal vanishing point determination, comprising the steps of;

    estimating text baselines by means of said position determining pixels of said pixel blobs, identifying horizontal vanishing point candidates from said estimated text baselines, and determining a horizontal vanishing point of said at least one text portion by means of said horizontal vanishing point candidates;

    vertical vanishing point determination, wherein a vertical vanishing point is determined for said at least one text portion on the basis of vertical features thereof;

    and projective correction, wherein said perspective in said image is corrected on the basis of said horizontal and vertical vanishing points;

    wherein said horizontal vanishing point determination comprises a first elimination step on the level of said position determining pixels, a second elimination step on the level of text baselines and a third elimination step on the level of horizontal vanishing point candidates.

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