Images 1 through 4 are the same examples given in problem description

Images 5 through 8 are the bit-flipped versions of the first four


Image 9 to 22:  Checkerboard patterns with alternating orientations.
                   All regions are 50% other than leaves.


Image 23: Tests the accurate evaluation of the threshold for the
      overall region.  There are 2088 zeros out of 4096 which is
      50.9765%, so this does not meet the top-level threshold

Image 24:  bit-flipped version of Image 23

Image 25: Tests the accurate evaluation of the threshold for the
      overall region.  There are 2089 zeros out of 4096 which is
      51.0009765%, so this should meet the top-level threshold

Image 26:  bit-flipped version of Image 25

Image 27: Tests the accurate evaluation of the threshold for the
      overall region.  There are 3031 zeros out of 4096 which is
      73.999023%, so this does not meet the top-level threshold

Image 28:  bit-flipped version of Image 27

Image 29: Tests the accurate evaluation of the threshold for the
      overall region.  There are 3032 zeros out of 4096 which is
      74.0234%, so this should meet the top-level threshold

Image 30:  bit-flipped version of Image 29

Image 31 the accurate evaluation of the threshold for the
      overall region.  There are 552 zeros out of 1024, which is
      53.90625%, so this does not meet the top-level threshold

Image 32-flipped version of Image 31

Image 33 the accurate evaluation of the threshold for the
      overall region.  There are 553 zeros out of 1024, which is
      54.00390625%, so this meets the top-level threshold

Image 34:  bit-flipped version of Image 33

Image 35. Width 64 image that composes four quadrants from Images 31
     to 34 Top-level percentage is 50%, and then subquadrants should
     be treated as with those earlier cases.

Image 36: Tests the accurate evaluation of the threshold for the
      overall region.  There are 727 zeros out of 1024, which is
      70.99609%, so this does not meet the top-level threshold

Image 37-flipped version of Image 36

Image 38 the accurate evaluation of the threshold for the
      overall region.  There are 728 zeros out of 1024, which is
      71.09375%, so this meets the top-level threshold

Image 39-flipped version of Image 38

Image 40: width 64 image that composes four quadrants from Images 36
     to 39.  Top-level percentage is 50%, and then subquadrants should be
     treated as with those earlier cases.