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Method of image transformation in a display device

  • US 4,484,347 A
  • Filed: 02/16/1982
  • Issued: 11/20/1984
  • Est. Priority Date: 02/23/1981
  • Status: Expired due to Fees
First Claim
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1. A method for transforming a first image into a second image having a different scale, location or orientation to obtain an intensity distribution in the second image according to the intensities at discrete positions of the first image which is provided in a matrix manner, comprising:

  • a first step of calculating a first position in said first image from an arbitrarily-selected second position in the second image on the basis of a selected transformation factor;

    a second step of determining a group of the four mutually-nearest discrete positions in the first image which are nearest to the calculated first position;

    a third step of determining an intensity weight factor for each of the respective four discrete positions based on the intensity at a respective discrete position and the two distances along column and row directions of the matrix between the calculated first position and the one of the four discrete positions diagonally opposing the respective discrete position and on the basis of the intensity distribution of the four discrete positions; and

    a fourth step of determining the intensity at the second position by adding the intensity weight factors determined for the respective four discrete positions.

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