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Imagick::deskewImage — Removes skew from the image
$threshold
)This method can be used to remove skew from for example scanned images where the paper was not properly placed on the scanning surface. 此方法在Imagick基于ImageMagick 6.4.5以上版本编译时可用。
thresholdDeskew threshold
Example #1 Imagick::deskewImage()
<?php
function deskewImage($threshold) {
$imagick = new \Imagick(realpath("images/NYTimes-Page1-11-11-1918.jpg"));
$deskewImagick = clone $imagick;
//This is the only thing required for deskewing.
$deskewImagick->deskewImage($threshold);
//The rest of this example is to make the result obvious - because
//otherwise the result is not obvious.
$trim = 9;
$deskewImagick->cropImage($deskewImagick->getImageWidth() - $trim, $deskewImagick->getImageHeight(), $trim, 0);
$imagick->cropImage($imagick->getImageWidth() - $trim, $imagick->getImageHeight(), $trim, 0);
$deskewImagick->resizeimage($deskewImagick->getImageWidth() / 2, $deskewImagick->getImageHeight() / 2, \Imagick::FILTER_LANCZOS, 1);
$imagick->resizeimage($imagick->getImageWidth() / 2, $imagick->getImageHeight() / 2, \Imagick::FILTER_LANCZOS, 1);
$newCanvas = new \Imagick();
$newCanvas->newimage($imagick->getImageWidth() + $deskewImagick->getImageWidth() + 20, $imagick->getImageHeight(), 'red', 'jpg');
$newCanvas->compositeimage($imagick, \Imagick::COMPOSITE_COPY, 5, 0);
$newCanvas->compositeimage($deskewImagick, \Imagick::COMPOSITE_COPY, $imagick->getImageWidth() + 10, 0);
header("Content-Type: image/jpg");
echo $newCanvas->getImageBlob();
}
?>