PHP | Imagick adaptiveThresholdImage() Function

The Imagick::adaptiveThresholdImage() function is an inbuilt function in PHP which is used to select a threshold for each pixel based on intensity values in its local neighborhood. This function allows to thresholding of an image whose global intensity histogram doesn’t contain distinctive peaks.

Syntax:

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

Parameters: This function accepts three parameters as mentioned above and described below:

• $width: This parameter is used to set the width of local neighborhood.
• $height: This parameter is used to set the height of local neighborhood.
• $offset: This parameter is used to set mean offset.

Return Value: This function returns TRUE on success.

Below program illustrate the Imagick::adaptiveThresholdImage() function in PHP:

Original Image:

Program:

<?php

// require_once('path/to/vendor/autoload.php');

header('Content-type: image/png');

$image = new Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-9.png');

$image->adaptiveThresholdImage(1024, 73, 0.625);

echo $image;
?>

Output:

Reference: http://php.net/manual/en/imagick.adaptivethresholdimage.php