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<?php |
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namespace stojg\crop; |
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/** |
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* CropBalanced |
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* |
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* This class calculates the most interesting point in the image by: |
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* |
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* 1. Dividing the image into four equally squares |
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* 2. Find the most energetic point per square |
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* 3. Finding the images weighted mean interest point |
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* |
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* @todo Refactor to make cleaner |
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* @todo Rename the class to something more sensible |
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*/ |
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class CropBalanced extends Crop |
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{ |
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/** |
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* get special offset for class |
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* |
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* @param \Imagick $original |
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* @param int $targetWidth |
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* @param int $targetHeight |
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* @return array |
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*/ |
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protected function getSpecialOffset(\Imagick $original, $targetWidth, $targetHeight) |
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{ |
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return $this->getRandomEdgeOffset($original, $targetWidth, $targetHeight); |
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} |
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/** |
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* |
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* @param \Imagick $original |
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* @param int $targetWidth |
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* @param int $targetHeight |
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* @return array |
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*/ |
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protected function getRandomEdgeOffset(\Imagick $original, $targetWidth, $targetHeight) |
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{ |
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$measureImage = clone($original); |
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// Enhance edges with radius 1 |
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$measureImage->edgeimage(1); |
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// Turn image into a grayscale |
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$measureImage->modulateImage(100, 0, 100); |
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// Turn everything darker than this to pitch black |
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$measureImage->blackThresholdImage("#070707"); |
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// Get the calculated offset for cropping |
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return $this->getOffsetBalancedForImage($measureImage, $targetWidth, $targetHeight); |
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} |
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/** |
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* |
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* @param int $targetWidth |
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* @param int $targetHeight |
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* @return array |
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* @todo refactor so it follows DRY |
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*/ |
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public function getOffsetBalanced($targetWidth, $targetHeight) |
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{ |
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return $this->getOffsetBalancedForImage($this->originalImage, $targetWidth, $targetHeight); |
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} |
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/** |
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* @param \Imagick $image |
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* @param $targetWidth |
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* @param $targetHeight |
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* @return array |
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* @throws \Exception |
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*/ |
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private function getOffsetBalancedForImage(\Imagick $image, $targetWidth, $targetHeight) |
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{ |
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$size = $image->getImageGeometry(); |
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$points = array(); |
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$halfWidth = ceil($size['width']/2); |
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$halfHeight = ceil($size['height']/2); |
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// First quadrant |
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$clone = clone($image); |
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$clone->cropimage($halfWidth, $halfHeight, 0, 0); |
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$point = $this->getHighestEnergyPoint($clone); |
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$points[] = array('x' => $point['x'], 'y' => $point['y'], 'sum' => $point['sum']); |
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// Second quadrant |
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$clone = clone($image); |
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$clone->cropimage($halfWidth, $halfHeight, $halfWidth, 0); |
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$point = $this->getHighestEnergyPoint($clone); |
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$points[] = array('x' => $point['x']+$halfWidth, 'y' => $point['y'], 'sum' => $point['sum']); |
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// Third quadrant |
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$clone = clone($image); |
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$clone->cropimage($halfWidth, $halfHeight, 0, $halfHeight); |
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$point = $this->getHighestEnergyPoint($clone); |
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$points[] = array('x' => $point['x'], 'y' => $point['y']+$halfHeight, 'sum' => $point['sum']); |
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// Fourth quadrant |
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$clone = clone($image); |
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$clone->cropimage($halfWidth, $halfHeight, $halfWidth, $halfHeight); |
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$point = $point = $this->getHighestEnergyPoint($clone); |
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$points[] = array('x' => $point['x']+$halfWidth, 'y' => $point['y']+$halfHeight, 'sum' => $point['sum']); |
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// get the totalt sum value so we can find out a mean center point |
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$totalWeight = array_reduce( |
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$points, |
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function ($result, $array) { |
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return $result + $array['sum']; |
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} |
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); |
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$centerX = 0; |
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$centerY = 0; |
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// If we found a center point, made the calculations to found the coords |
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if ($totalWeight) { |
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// Calulate the mean weighted center x and y |
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$totalPoints = count($points); |
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for ($idx=0; $idx < $totalPoints; $idx++) { |
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$centerX += $points[$idx]['x'] * ($points[$idx]['sum'] / $totalWeight); |
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$centerY += $points[$idx]['y'] * ($points[$idx]['sum'] / $totalWeight); |
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} |
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} |
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// From the weighted center point to the topleft corner of the crop would be |
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$topleftX = max(0, ($centerX - $targetWidth / 2)); |
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$topleftY = max(0, ($centerY - $targetHeight / 2)); |
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// If we don't have enough width for the crop, back up $topleftX until |
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// we can make the image meet $targetWidth |
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if ($topleftX + $targetWidth > $size['width']) { |
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$topleftX -= ($topleftX+$targetWidth) - $size['width']; |
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} |
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// If we don't have enough height for the crop, back up $topleftY until |
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// we can make the image meet $targetHeight |
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if ($topleftY+$targetHeight > $size['height']) { |
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$topleftY -= ($topleftY+$targetHeight) - $size['height']; |
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} |
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return array('x'=>$topleftX, 'y'=>$topleftY); |
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} |
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/** |
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* By doing random sampling from the image, find the most energetic point on the passed in |
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* image |
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* |
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* @param \Imagick $image |
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* @return array |
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*/ |
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protected function getHighestEnergyPoint(\Imagick $image) |
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{ |
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$size = $image->getImageGeometry(); |
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// It's more performant doing random pixel uplook via GD |
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$im = imagecreatefromstring($image->getImageBlob()); |
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if ($im === false) { |
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$msg = 'GD failed to create image from string'; |
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throw new \Exception($msg); |
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} |
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$xcenter = 0; |
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$ycenter = 0; |
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$sum = 0; |
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// Only sample 1/50 of all the pixels in the image |
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$sampleSize = round($size['height']*$size['width'])/50; |
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for ($k=0; $k<$sampleSize; $k++) { |
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$i = mt_rand(0, $size['width']-1); |
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$j = mt_rand(0, $size['height']-1); |
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$rgb = imagecolorat($im, $i, $j); |
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$r = ($rgb >> 16) & 0xFF; |
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$g = ($rgb >> 8) & 0xFF; |
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$b = $rgb & 0xFF; |
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$val = $this->rgb2bw($r, $g, $b); |
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$sum += $val; |
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$xcenter += ($i+1)*$val; |
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$ycenter += ($j+1)*$val; |
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} |
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if ($sum) { |
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$xcenter /= $sum; |
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$ycenter /= $sum; |
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} |
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$point = array('x' => $xcenter, 'y' => $ycenter, 'sum' => $sum/round($size['height']*$size['width'])); |
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return $point; |
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} |
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} |
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stojg /
crop
