A simple way to blur an image is to replace each pixel
with the average of it and its neighboring pixels.
The value of each pixel in the blurred image is computed
by adding the values of the 3x3 region centered at the
corresponding pixel of the original image, and dividing
by 9.
When computing the value of pixels on the border, the 3x3 region will
fall partially outside of the original image. Assume that
pixels outside of the original image are black.
For example, given the following original image:
the algorithm described above results in the following blurred image:
Write a method that will, given a blurred image, return the original image.
The original image will contain only black and white pixels.
All pixels on the top and bottom rows and left and right
columns of the original image will be black.
All values of the blurred image will therefore be: 0 (black), 1/9, 2/9,
3/9, 4/9, 5/9, 6/9, 7/9, 8/9, or 9/9 (white).
The blurred image will be given as a String[].
Each character in the blurred image will be a character between
'0' and '9', inclusive, giving the value of that pixel multiplied
by nine.
For example, the blurred image above would be given as:
{ "1233321000000000123332100000000000000000000",
"1244422233222332334343323322232112332223321",
"1255523344343443545343434434343233432334432",
"0033303455465775633011445546454355753457753",
"0033303333364543533011433336333364521346542",
"0033303455464532445343545546454355753446542",
"0022202344342200234343434434343233432323221",
"0011101233221100123332223322232112332211111" }
Return the original image as a String[].
For each pixel in the original image, return a '.'
if it is black and '#' if it is white.
For example, the original image for the example
above would be returned as:
{ "...........................................",
".#####...........#####.....................",
"...#...####.####.#...#.####.###..####.####.",
"...#...#..#.#..#.#.....#..#.#..#.#....#..#.",
"...#...#..#.####.#.....#..#.#..#.###..####.",
"...#...#..#.#....#...#.#..#.#..#.#....#.#..",
"...#...####.#....#####.####.###..####.#..#.",
"..........................................." }
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