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Technique for classifying objects within an image

  • US 6,556,708 B1
  • Filed: 02/06/1998
  • Issued: 04/29/2003
  • Est. Priority Date: 02/06/1998
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method of image management comprising the steps of:

  • storing a plurality of source images;

    dividing the plurality of source images into a first subset of the plurality of source images and a second subset of the plurality of source images;

    selecting the first subset of the plurality of source images;

    forming a background image using the selected first subset of the plurality of source images;

    comparing a first source image included in the second subset of the plurality of source images with the formed background image, wherein the first source image is not included with the first subset of the plurality of images;

    responsive to comparing the first source image with the formed background image, identifying object images included in the first source image; and

    applying a differencing algorithm further comprises the steps of;

    computing a Y-mask image;

    computing a UV-mask image;

    comparing the Y-mask image and the UV-mask image; and

    computing a YUV mask image responsive to the step of comparing the Y-mask image and the UV-mask image;

    using a known position and orientation of a video camera that has captured the plurality of source images to determine first object characteristics of the object images identified;

    determining second object characteristics, the characteristics including size, shape and ratio of width to height;

    applying a filter to determine if at least one of the first object characteristics of the identified object images corresponds with one second object characteristic;

    selecting an identified object when the first object characteristic of the identified object image corresponds with the second object characteristic;

    tracking the identified object through a second source image wherein the second source image is included in the second subset of the plurality of source images; and

    updating the background image by including therein the first and the second source images less the identified object.

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