Imagick::adaptiveThresholdImage

(PECL imagick 2.0.0)

Imagick::adaptiveThresholdImage — Selects a threshold for each pixel based on a range of intensity

Beschreibung

Imagick::adaptiveThresholdImage ( int $width , int $height , int $offset ) : bool

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.

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();
}

?>