Imagick::subImageMatch

(PECL imagick 3 >= 3.3.0)

Imagick::subImageMatch — Searches for a subimage in the current image and returns a similarity image

Descrizione

public Imagick::subImageMatch(Imagick $Imagick, array &$offset = ?, float &$similarity = ?): Imagick

Searches for a subimage in the current image and returns a similarity image such that an exact match location is completely white and if none of the pixels match, black, otherwise some gray level in-between. You can also pass in the optional parameters bestMatch and similarity. After calling the function similarity will be set to the 'score' of the similarity between the subimage and the matching position in the larger image, bestMatch will contain an associative array with elements x, y, width, height that describe the matching region.

Elenco dei parametri

Imagick
offset
similarity: A new image that displays the amount of similarity at each pixel.

Valori restituiti

Esempi

Example #1 Imagick::subImageMatch()

<?php
function subImageMatch($imagePath) {
    $imagick = new \Imagick(realpath($imagePath));
    $imagick2 = clone $imagick;
    $imagick2->cropimage(40, 40, 250, 110);
    $imagick2->vignetteimage(0, 1, 3, 3);

    $similarity = null;
    $bestMatch = null;
    $comparison = $imagick->subImageMatch($imagick2, $bestMatch, $similarity);

    $comparison->setImageFormat('png');
    header("Content-Type: image/png");
    echo $imagick->getImageBlob();
}

?>

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User Contributed Notes 1 note

down

inipel at ya dot ru ¶

3 years ago

After $ im->cropImage method, $ im->subImageMatch doesn't work, before using $ im->subImageMatch, use $ im->setImagePage(0, 0, 0, 0);

The sequence is as follows:
$ im->cropImage();
$ im->setImagePage (0, 0, 0, 0);
$ im->subImageMatch()

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