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Imagick::adaptiveThresholdImage

PHP function Edit on GitHub ✎

(PECL imagick 2, PECL imagick 3)

Selects a threshold for each pixel based on a range of intensity

Description

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.

Parameters

width: Width of the local neighborhood.
height: Height of the local neighborhood.
offset: The mean offset

Return Values

Success

Examples

Imagick::adaptiveThresholdImage()

php

<?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();
}

?>

Source: reference/imagick/imagick/adaptivethresholdimage.xml · from the official PHP manual (php/doc-en)