Thinning Operator

Building the Cantata Workspace


To build a workspace to experiment with the thinning operator:
  1. Select and Display the image $MMACH/viff/thinthick.xv using the operators User Defined, Expand and Display Image. Expand is used to make the pixels look larger as the original image is very small.

  2. Build the two Structuring Elements A and B using two 3x3 Str.El. operators.

  3. Use operators Sup-Gen. and Subtraction (mmach)

Exercises

  1. Repeat the same experiment but thinning pixels with have the left and right pixels equal to one.

  2. Repeat the same experiment by thinning pixels shich are end points of one pixel thin objects. In this experiment use the image supgen.xv. (Hint: use the operator Rotate Str. El.)

  3. Are the thinning operators used in this experiment and in the above exercice homotopic?

  4. Repeat the same experiment to thin the pixels that are in the corner, but using a homotopic thinning operator using a 4-connectedness topology. (Hint: use the operator Rotate Str. El.)