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Hi, I'm writing a script that scans images for numberplate edges in different angles. The below script works and picks up the edges in ~2 seconds. I'm curious if I can improve this to find the edges even faster. real 0m1.917s user 0m1.767s sys 0m0.125s <?php require __DIR__ . '/../vendor/autoload.php'; use Imagine\Image\Palette\Color\ColorInterface; use Imagine\Image\PointInterface; use Imagine\Image\ImageInterface; use Imagine\Image\Point; $topLeft = $bottomLeft = [99999, 0]; $topRight = $bottomRight = [0, 99999]; $gatherer = function (ColorInterface $color, PointInterface $point, ImageInterface $image) use (&$topLeft, &$topRight, &$bottomLeft, &$bottomRight) { if ($color->getAlpha() == 0) { return; } $x = $point->getX(); $y = $point->getY(); $top = $image->getColorAt(new Point($x, $y - 1))->isOpaque(); $bottom = $image->getColorAt(new Point($x, $y + 1))->isOpaque(); $left = $image->getColorAt(new Point($x - 1, $y))->isOpaque(); $right = $image->getColorAt(new Point($x + 1, $y))->isOpaque(); if (!$top && !$left && $bottom && $right && $x < $topLeft[0]) { $topLeft = [$x, $y]; } if (!$top && !$right && $bottom && $left && $x > $topRight[0]) { $topRight = [$x, $y]; } if (!$bottom && !$left && $top && $right && $x < $bottomLeft[0]) { $bottomLeft = [$x, $y]; } if (!$bottom && !$right && $top && $left && $x > $bottomRight[0]) { $bottomRight = [$x, $y]; } }; //$img = (new \Imagine\Gd\Imagine())->open(__DIR__ . '/numberplate-test.png'); $img = (new \Imagine\Gd\Imagine())->open(__DIR__ . '/numberplate-test2.png'); for ($top = 640; $top < 900; $top++) { for ($left = 340; $left < 1580; $left++) { $point = new Point($left, $top); $gatherer($img->getColorAt($point), $point, $img); } } var_dump($topLeft, $topRight, $bottomLeft, $bottomRight);