Mona's Histogram:

Letter's Histogram:

ACDC's Histogram (YES!):

histogram

threshold

contrast

Answer to the rest of HW3:

1 a.  1/9  1/9  1/9

      1/9  1/9  1/9

        1/9  1/9  1/9

  b.  convolution

  c.  Yes. The convolution result will produce pixels with noise reaped.

  d.   0 -1 -1

      -1  1  1

         1  1  0

2  12.5/d = (12.5+80/72)/(d+0.5)

   d = 5.625 inches