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  1. function sobel(image, width, height) {
  2.   var temp = new Array(image.length / 4);
  3.   function get_index(_x, _y) {
  4.     return (width * _y + _x) * 4;
  5.   }
  6.   // モノクロにする
  7.   for (var i = 0; i < image.length; i += 4) {
  8.     image[i] = Math.floor((image[i] + image[i+1] + image[i+2]) / 3);
  9.   }
  10.   for (var y = 1; y < height - 1; y++) {
  11.     var index = width * y * 4;
  12.     for (var x = 1; x < width - 1; x++) {
  13.       var ghs = image[ index + (x - 1 - width) * 4 ] * -1
  14.               + image[ index + (x + 1 - width) * 4 ]
  15.               + image[ index + (x - 1)         * 4 ] * -2
  16.               + image[ index + (x + 1)         * 4 ] *  2
  17.               + image[ index + (x - 1 + width) * 4 ] * -1
  18.               + image[ index + (x + 1 + width) * 4 ];
  19.       var gvs = image[ index + (x - 1 - width) * 4 ] * -1
  20.               + image[ index + (x     - width) * 4 ] * -2
  21.               + image[ index + (x + 1 - width) * 4 ] * -1
  22.               + image[ index + (x - 1 + width) * 4 ]
  23.               + image[ index + (x     + width) * 4 ] * 2
  24.               + image[ index + (x + 1 + width) * 4 ];
  25.       var g = Math.floor(Math.sqrt(ghs * ghs + gvs * gvs));
  26.       index = get_index(x, y) / 4;
  27.       temp[ index ] = 255 - g;
  28.     }
  29.   }
  30.   for (var i = 0; i < image.length; i += 4) {
  31.     image[i] = image[i+1] = image[i+2] = temp[i / 4];
  32.   }
  33. }
  34.  
  35. function gaussian3x3(image, width, height) {
  36.   var temp = new Array(image.length);
  37.   function get_index(_x, _y) {
  38.     return (width * _y + _x) * 4;
  39.   }
  40.   function filter(_x, _y, _i) {
  41.     return (
  42.         image[ get_index(_x-1, _y-1) + _i ]
  43.       + image[ get_index(_x  , _y-1) + _i ] * 2
  44.       + image[ get_index(_x+1, _y-1) + _i ]
  45.       + image[ get_index(_x-1, _y  ) + _i ] * 2
  46.       + image[ get_index(_x  , _y  ) + _i ] * 4
  47.       + image[ get_index(_x-1, _y  ) + _i ] * 2
  48.       + image[ get_index(_x-1, _y+1) + _i ]
  49.       + image[ get_index(_x  , _y+1) + _i ] * 2
  50.       + image[ get_index(_x+1, _y+1) + _i ]
  51.     ) / 16;
  52.   }
  53.   for (var i = 0; i < image.length; i += 4) {
  54.     temp[i    ] = image[i    ];
  55.     temp[i + 1] = image[i + 1];
  56.     temp[i + 2] = image[i + 2];
  57.   }
  58.   for (var y = 1; y < height - 1; y++) {
  59.     for (var x = 1; x < width - 1; x++) {
  60.       var index = get_index(x, y);
  61.       temp[index    ] = filter(x, y, 0);
  62.       temp[index + 1] = filter(x, y, 1);
  63.       temp[index + 2] = filter(x, y, 2);
  64.     }
  65.   }
  66.   for (var i = 0; i < image.length; i += 4) {
  67.     image[i  ] = temp[i  ];
  68.     image[i+1] = temp[i+1];
  69.     image[i+2] = temp[i+2];
  70.   }
  71. }
  72.  
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https://ideone.com/522Yt
language:
JavaScript (rhino 1.7.9)
created:
12 years ago
visibility:
public

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