>> image_edge_test
03-Feb-2019 14:07:36

IMAGE_EDGE_TEST:
  MATLAB version.
  Test IMAGE_EDGE.

IMAGE_EDGE
  MATLAB version
  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.

03-Feb-2019 14:08:08
>>