Image Segmentation

EDGE DETECTION, LINKING, AND BOUNDARY DETECTION

• 3 x 3 gradient masks may be used to detect edges; however, their outputs are almost always discontinuous and need to be linked.

• Two principal properties that may be used to establish the similarity of edge pixels from gradient images are:

  • The strength of the gradient at the pixel - a pixel (x', y') in a neighborhood of (x, y) is similar in gradient magnitude to the pixel (x,y) (T is a threshold).
  • The direction of the gradient at the pixel - a pixel (x', y') in a neighborhood of (x, y) is similar in gradient direction to the pixel (x,y) if

(A is threshold).

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