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Object recognition method and apparatus for determining the presence and shape of an object

  • US 5,263,098 A
  • Filed: 07/08/1991
  • Issued: 11/16/1993
  • Est. Priority Date: 07/06/1990
  • Status: Expired due to Fees
First Claim
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1. An object recognition apparatus which processes pixels positioned in a plurality of predetermined partial areas of an image containing an object to be recognized for determination whether the object is present or absent in each of the partial areas, comprising:

  • first means for preparing a histogram of densities of whole pixels for each partial area while the image is being scanned, wherein the first means includes a histogram memory which has addresses defined by the combinations of numbers indicating the partial areas and all possible densities of the pixels in the partial areas, the histogram memory being initialized before the preparation of the histogram is started so that data at each address represents a value of zero, and when, in each partial area, an actual density is obtained, data at the address determined by the combination of the number representing the partial area and the actual density is read out from the histogram memory and incremented by one and the so incremented data is stored in the histogram memory at the same address;

    second means for comparing the histogram obtained by the first means for each partial area with reference data; and

    third means for determining whether the object is present or absent in each partial area based on a comparison result obtained by the second means.

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