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(PECL imagick 2, PECL imagick 3)
Imagick::adaptiveThresholdImage — Selects a threshold for each pixel based on a range of intensity
$width, int $height, int $offset): bool
Selects an individual threshold for each pixel based on the range of intensity values in its local neighborhood. This allows for thresholding of an image whose global intensity histogram doesn't contain distinctive peaks.
width
Width of the local neighborhood.
height
Height of the local neighborhood.
offset
The mean offset
成功时返回 true。
示例 #1 Imagick::adaptiveThresholdImage()
<?php
function adaptiveThresholdImage($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();
}
?>
