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Digital image processing method for local determination of the center and the width of objects in the form of contrasting bands on a background

  • US 5,768,405 A
  • Filed: 09/26/1996
  • Issued: 06/16/1998
  • Est. Priority Date: 07/22/1993
  • Status: Expired due to Fees
First Claim
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1. A method for the processing of a digital image, comprising the representation of objects in the form of contrasting bands of substantially uniform intensity on a substantially uniform background, which method comprises a tracking procedure for the identification of pixels situated on the central lines of the objects, characterized in that said tracking procedure comprises a first filtering operation which is executed by applying to the digital image a set of N bi-dimensional, recursive, oriented, selective low-pass filters, to produce a set of N respective filtered images, N being an integer greater than 2, each filter having a lozenge-shaped base and a major principal axis, the major principal axes of the filters being angularly spaced apart 180°

  • /N, said set of filters being applied in such a manner that each filter is passed on points of said digital image along lines and columns parallel and perpendicular to the major principal axis of its base, in causal and anticausal directions, to produce the respective filtered image, the existence and direction of each band-shaped object segment in the digital image being determined from said set of filtered images.

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