Imagick::adaptiveThresholdImage
(PECL imagick 2.0.0)
Imagick::adaptiveThresholdImage — Selects a threshold for each pixel based on a range of intensity
說明
bool Imagick::adaptiveThresholdImage
( int
$width
, int $height
, int $offset
)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.
參數
-
width -
Width of the local neighborhood.
-
height -
Height of the local neighborhood.
-
offset -
The mean offset
回傳值
成功時回傳 TRUE。
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