Imagick::adaptiveThresholdImage
(PECL imagick 2, PECL imagick 3)
Imagick::adaptiveThresholdImage — Selects a threshold for each pixel based on a range of intensity
Beschreibung
public Imagick::adaptiveThresholdImage(int
$width, int $height, int $offset): boolSelects an individual threshold for each pixel based on the range of intensity values in its local neighborhood. This allows for thresholding of an image whose global intensity histogram doesn't contain distinctive peaks.
Parameter-Liste
-
width -
Width of the local neighborhood.
-
height -
Height of the local neighborhood.
-
offset -
The mean offset
Rückgabewerte
Liefert true bei Erfolg.
Beispiele
Beispiel #1 Imagick::adaptiveThresholdImage()
<?php
function adaptiveThresholdImage($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();
}
?>
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