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13-May-2025 14:54:50

image_edge_test():
  MATLAB/Octave version 9.11.0.2358333 (R2021b) Update 7
  Test image_edge().

IMAGE_EDGE
  MATLAB/Octave version 9.11.0.2358333 (R2021b) Update 7
  Demonstrate the NEWS stencil for edge detection
  in images.

  Reading "coins.ascii.pgm".

Figure 1:
 This is the original gray scale image.

Figure 2:
  We have added a border of 1-pixel thickness.
  Now all the pixels in the original picture 
  have a 3x3 pixel neighborhood.

Figure 3:
  We computed the value of E for each pixel,
  and scaled it to [0,255].

Figure 4:
  We zeroed all the pixels with a value of E
  less than the threshold of 50
  so the edges show up better.

Figure 5:
  Black lines on white background are MUCH easier
  to read.

Figure 6:
  This is actually an RGB "color" image.
  This way, we can show the detected edges in red.

IMAGE_EDGE:
  Normal end of execution.

image_edge_test():
  Normal end of execution.

13-May-2025 14:55:26