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Method and device for binary segmentation of a signal representing a digital image with a threshold obtained using a histogram

  • US 5,832,111 A
  • Filed: 07/30/1996
  • Issued: 11/03/1998
  • Est. Priority Date: 12/21/1990
  • Status: Expired due to Fees
First Claim
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1. A method of binary segmentation of a video image which includes at least one target object and at least one noise element against a common background;

  • said image being represented by a video signal corresponding to grey levels of respective pixels therein, a target object having pixel grey levels which differ from the pixel grey levels of the background and of noise elements;

    said method comprising the steps of;

    (a) thresholding the video signal at respective grey threshold levels so as to derive for each threshold level a digital signal representing a binary segmented image corresponding to that threshold level;

    (b) determining from each of the digital signals, by labelling, a count of the number of objects in the corresponding binary segmented image, and storing the respective counts applicable to the respective binary segmented images;

    (c) forming a histogram of the stored counts as a function of the respective threshold levels;

    (d) automatically determining from said histogram a segmentation threshold applicable to said video image for distinguishing target objects from background and noise elements therein; and

    (e) applying said segmentation threshold to said video signal to derive a binary segmented video signal representing a binary segmented form of said video image in which target objects are distinguished from background and noise elements therein.

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