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Method for automatically comparing content of images for classification into events

  • US 6,351,556 B1
  • Filed: 11/20/1998
  • Issued: 02/26/2002
  • Est. Priority Date: 11/20/1998
  • Status: Expired due to Term
First Claim
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1. A method for comparing image content of first and second images, the method comprising the steps of:

  • (a) extracting a portion of both the first and second images both of which portions are determined to include a main subject area of each image;

    (b) dividing the main subject area of the images into a plurality of blocks;

    (c) computing a color histogram for one block in each image;

    (d) computing a histogram intersection value between the block of the first image and the block of the second image;

    (e) determining a first threshold value for the computed histogram intersection value that determines similarity between the block in the first image and the block in the second image; and

    (f) shifting the first image in a predetermined direction if there is not a similarity between the first and second images and redetermining the similarity between the images in step (c)-(e) for blocks that are shifted with respect to each other.

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