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| 1 | <?php |
| 2 | /** |
| 3 | * Jingga |
| 4 | * |
| 5 | * PHP Version 8.1 |
| 6 | * |
| 7 | * @package phpOMS\Image |
| 8 | * @copyright Dennis Eichhorn |
| 9 | * @license OMS License 2.0 |
| 10 | * @version 1.0.0 |
| 11 | * @link https://jingga.app |
| 12 | */ |
| 13 | declare(strict_types=1); |
| 14 | |
| 15 | namespace phpOMS\Image; |
| 16 | |
| 17 | /** |
| 18 | * Skew image |
| 19 | * |
| 20 | * @package phpOMS\Image |
| 21 | * @license OMS License 2.0 |
| 22 | * @link https://jingga.app |
| 23 | * @since 1.0.0 |
| 24 | */ |
| 25 | final class Skew |
| 26 | { |
| 27 | /** |
| 28 | * Automatically rotate image based on projection profile |
| 29 | * |
| 30 | * @param string $inPath Binary input image (black/white) |
| 31 | * @param string $outPath Output image |
| 32 | * @param int $maxDegree Max degree to consider for rotation |
| 33 | * @param array $start Start coordinates for analysis (e.g. ignore top/border of image) |
| 34 | * @param array $end End coordinates for analysis (e.g. ignore bottom/border of image) |
| 35 | */ |
| 36 | public static function autoRotate(string $inPath, string $outPath, int $maxDegree = 45, array $start = [], array $end = []) : void |
| 37 | { |
| 38 | $im = null; |
| 39 | if (\strripos($inPath, 'png') !== false) { |
| 40 | $im = \imagecreatefrompng($inPath); |
| 41 | } elseif (\strripos($inPath, 'jpg') !== false || \strripos($inPath, 'jpeg') !== false) { |
| 42 | $im = \imagecreatefromjpeg($inPath); |
| 43 | } else { |
| 44 | $im = \imagecreatefromgif($inPath); |
| 45 | } |
| 46 | |
| 47 | if ($im === false) { |
| 48 | return; |
| 49 | } |
| 50 | |
| 51 | $dim = [\imagesx($im), \imagesy($im)]; |
| 52 | |
| 53 | $start = [\max(0, $start[0] ?? 0), \max(0, $start[1] ?? 0)]; |
| 54 | $end = [\min($dim[0], $end[0] ?? $dim[0]), \min($dim[1], $end[1] ?? $dim[1])]; |
| 55 | |
| 56 | // Pixelmatrix [width][height] |
| 57 | // This is important since it makes the hist calculation further down easier |
| 58 | $imMatrix = [[]]; |
| 59 | |
| 60 | $avg = 0; |
| 61 | |
| 62 | for ($i = $start[0]; $i < $end[0]; ++$i) { |
| 63 | for ($j = $start[1]; $j < $end[1]; ++$j) { |
| 64 | $imMatrix[$j - $start[1]][$i - $start[0]] = \imagecolorat($im, $i, $j) < 0.5 ? 1 : 0; |
| 65 | $avg += $imMatrix[$j - $start[1]][$i - $start[0]]; |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | $avg /= $start[1] - $end[1]; |
| 70 | |
| 71 | $dimImMatrix = [\count($imMatrix), \count($imMatrix[0])]; |
| 72 | $bestScore = 0; |
| 73 | $bestDegree = 0; |
| 74 | |
| 75 | for ($i = -$maxDegree; $i < $maxDegree; ++$i) { |
| 76 | if ($i === 0) { |
| 77 | continue; |
| 78 | } |
| 79 | |
| 80 | $rotated = self::rotatePixelMatrix($imMatrix, $dimImMatrix, $i); |
| 81 | $hist = []; |
| 82 | |
| 83 | for ($j = 0; $j < $dimImMatrix[0]; ++$j) { |
| 84 | $hist[$j] = \array_sum($rotated[$j]); |
| 85 | |
| 86 | // cleanup for score function |
| 87 | // we want to see how many lines are above avg. and how much they are above avg. |
| 88 | // a different score function may not need this line |
| 89 | $hist[$j] = $hist[$j] > $avg ? $hist[$j] : 0; |
| 90 | } |
| 91 | |
| 92 | $score = \array_sum($hist); |
| 93 | if ($bestScore < $score) { |
| 94 | $bestScore = $score; |
| 95 | $bestDegree = $i; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | $im = \imagerotate($im, $bestDegree, 1); |
| 100 | if ($im === false) { |
| 101 | return; |
| 102 | } |
| 103 | |
| 104 | if (\strripos($outPath, 'png') !== false) { |
| 105 | \imagepng($im, $outPath); |
| 106 | } elseif (\strripos($outPath, 'jpg') !== false || \strripos($outPath, 'jpeg') !== false) { |
| 107 | \imagejpeg($im, $outPath); |
| 108 | } else { |
| 109 | \imagegif($im, $outPath); |
| 110 | } |
| 111 | |
| 112 | \imagedestroy($im); |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Rotate the pixel matrix by a certain degree |
| 117 | * |
| 118 | * @param array $pixel Pixel matrix (0 index = y, 1 index = x) |
| 119 | * @param array $dim Matrix dimension (0 index = y, 1 index = x) |
| 120 | * @param int $deg Degree to rotate |
| 121 | * |
| 122 | * @return array |
| 123 | * |
| 124 | * @since 1.0.0 |
| 125 | */ |
| 126 | public static function rotatePixelMatrix(array $pixel, array $dim, int $deg) : array |
| 127 | { |
| 128 | $rad = \deg2rad($deg); |
| 129 | |
| 130 | $sin = \sin(-$rad); |
| 131 | $cos = \cos(-$rad); |
| 132 | |
| 133 | $rotated = [[]]; |
| 134 | |
| 135 | $cXArr = []; |
| 136 | for ($j = 0; $j < $dim[1]; ++$j) { |
| 137 | $cXArr[] = $j - $dim[1] / 2.0; // center |
| 138 | } |
| 139 | |
| 140 | for ($i = 0; $i < $dim[0]; ++$i) { |
| 141 | $cY = $i - $dim[0] / 2.0; // center |
| 142 | |
| 143 | foreach ($cXArr as $j => $cX) { |
| 144 | $x = $cos * $cX + $sin * $cY + $dim[1] / 2.0; |
| 145 | $y = -$sin * $cX + $cos * $cY + $dim[0] / 2.0; |
| 146 | |
| 147 | $rotated[$i][$j] = self::getNearestValue($pixel, $dim, $x, $y); |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | return $rotated; |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Find the closes pixel based on floating points |
| 156 | * |
| 157 | * @param array $pixel Pixel matrix (0 index = y, 1 index = x) |
| 158 | * @param array $dim Matrix dimension (0 index = y, 1 index = x) |
| 159 | * @param float $x X coordinate |
| 160 | * @param float $y Y coordinate |
| 161 | * |
| 162 | * @return int |
| 163 | * |
| 164 | * @since 1.0.0 |
| 165 | */ |
| 166 | private static function getNearestValue(array $pixel, array $dim, float $x, float $y) : int |
| 167 | { |
| 168 | $xLow = ($x < 0) ? 0 : (($x > ($dim[1] - 1)) ? ($dim[1] - 1) : (int) $x); |
| 169 | $xHigh = ($xLow === $dim[1] - 1) ? $xLow : ($xLow + 1); |
| 170 | |
| 171 | $yLow = ($y < 0) ? 0 : (($y > ($dim[0] - 1)) ? ($dim[0] - 1) : (int) $y); |
| 172 | $yHigh = ($yLow === $dim[0] - 1) ? $yLow : ($yLow + 1); |
| 173 | |
| 174 | $points = [ |
| 175 | [$xLow, $yLow], |
| 176 | [$xLow, $yHigh], |
| 177 | [$xHigh, $yLow], |
| 178 | [$xHigh, $yHigh], |
| 179 | ]; |
| 180 | |
| 181 | $minDistance = \PHP_FLOAT_MAX; |
| 182 | $minValue = 0; |
| 183 | |
| 184 | foreach ($points as $point) { |
| 185 | $distance = ($point[0] - $x) * ($point[0] - $x) + ($point[1] - $y) * ($point[1] - $y); |
| 186 | |
| 187 | if ($distance < $minDistance) { |
| 188 | $minDistance = $distance; |
| 189 | |
| 190 | $minValue = $point[0] >= 0 && $point[0] < $dim[0] && $point[1] >= 0 && $point[1] < $dim[1] |
| 191 | ? $pixel[$point[1]][$point[0]] |
| 192 | : 0; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | return $minValue; |
| 197 | } |
| 198 | } |