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System and method for image edge detection using discrete cosine transforms

  • US 5,719,958 A
  • Filed: 05/15/1995
  • Issued: 02/17/1998
  • Est. Priority Date: 11/30/1993
  • Status: Expired due to Term
First Claim
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1. An image edge detection system comprising:

  • an image acquisition device for acquiring and converting an image into an image signal;

    a first memory for receiving and storing said image signal;

    a raster to block converter for segmenting said image signal into segments of predefined size;

    a transformation section for transforming said segmented image signal into discrete cosine transform (DCT) coefficients, taking an inverse discrete cosine transform (IDCT) of the DCT coefficients, and differentiating the IDCT coefficients to generate a differentiated signal;

    a block to raster converter for converting the differentiated signal into raster format then sending the converted differentiated signal to said first memory;

    a threshold comparator for binarizing said converted differentiated signal by comparing said converted differentiated signal with a predetermined threshold value;

    an output device for outputting, from said first memory, said binarized converted differentiated signal representing an edge detected image; and

    a controller for controlling said system in accordance with predetermined instructions from a central processing unit.

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