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(PECL imagick 2.0.0)
Imagick::adaptiveThresholdImage — Selects a threshold for each pixel based on a range of intensity
$width
, int $height
, int $offset
)Selects an individual threshold for each pixel based on the range of intensity values in its local neighborhood. This allows for thresholding of an image whose global intensity histogram doesn't contain distinctive peaks.
width Width of the local neighborhood.
height Height of the local neighborhood.
offset The mean offset
成功时返回 TRUE 。
Example #1 Imagick::adaptiveThresholdImage()
<?php
function adaptiveThresholdImage ( $imagePath , $width , $height , $adaptiveOffset ) {
$imagick = new \ Imagick ( realpath ( $imagePath ));
$adaptiveOffsetQuantum = intval ( $adaptiveOffset * \ Imagick :: getQuantum ());
$imagick -> adaptiveThresholdImage ( $width , $height , $adaptiveOffsetQuantum );
header ( "Content-Type: image/jpg" );
echo $imagick -> getImageBlob ();
}
?>