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Pattern detection in two dimensional signals

  • US 4,797,941 A
  • Filed: 07/01/1986
  • Issued: 01/10/1989
  • Est. Priority Date: 07/02/1985
  • Status: Expired due to Fees
First Claim
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1. A method of detecting a pattern feature in a two-dimensional electrical signal applied to a coordinate array of storage cells comprising, in a preliminary step, storing a plurality of template words, each template word being a plurality of storage cell address words, individual ones of which are associated with the individual values of one coordinate direction of the array and represent address values in the other coordinate direction, of cell locations coincident with a template, defining the pattern feature, mapped onto the array, and operationally applying a two-dimensional signal to said array of storage cells, extracting a stored template word addressing simultaneously a set of cells, one at each value of said one coordinate direction, at address values of said other coordinate direction defined by the template word, reading the signal levels of the addressed cells, determining whether substantially all of the levels of the addressed cells are characteristic of the levels of a pattern feature template, and in response to a successful determination, providing an indication that the pattern feature has been detected in the two dimensional electrical signal.

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