Imagick::forwardFourierTransformImage

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Imagick::forwardFourierTransformImage — Description

Description

public void Imagick::forwardFourierTransformimage ( bool $magnitude )

Implements the discrete Fourier transform (DFT) of the image either as a magnitude / phase or real / imaginary image pair.

Parameters

magnitude

If true, return as magnitude / phase pair otherwise a real / imaginary image pair.

Return Values

Examples

Example #1 Imagick::forwardFourierTransformImage()

<?php
//Utility function for forwardTransformImage
function createMask() {
    $draw = new \ImagickDraw(

    $draw->setStrokeOpacity(0
    $draw->setStrokeColor('rgb(255, 255, 255)'
    $draw->setFillColor('rgb(255, 255, 255)'

    //Draw a circle on the y-axis, with it's centre
    //at x, y that touches the origin
    $draw->circle(250, 250, 220, 250

    $imagick = new \Imagick(
    $imagick->newImage(512, 512, "black"
    $imagick->drawImage($draw
    $imagick->gaussianBlurImage(20, 20
    $imagick->autoLevelImage(

    return $imagick;
}


function forwardFourierTransformImage($imagePath) {
    $imagick = new \Imagick(realpath($imagePath)
    $imagick->resizeimage(512, 512, \Imagick::FILTER_LANCZOS, 1

    $mask = createMask(
    $imagick->forwardFourierTransformImage(true

    @$imagick->setimageindex(0
    $magnitude = $imagick->getimage(

    @$imagick->setimageindex(1
    $imagickPhase = $imagick->getimage(

    if (true) {
        $imagickPhase->compositeImage($mask, \Imagick::COMPOSITE_MULTIPLY, 0, 0
    }

    if (false) {
        $output = clone $imagickPhase;
        $output->setimageformat('png'
        header("Content-Type: image/png"
        echo $output->getImageBlob(
    }

    $magnitude->inverseFourierTransformImage($imagickPhase, true

    $magnitude->setimageformat('png'
    header("Content-Type: image/png"
    echo $magnitude->getImageBlob(
}

?>

← Imagick::flopImage

Imagick::frameImage →

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Licensed under the Creative Commons Attribution License v3.0 or later.

https://secure.php.net/manual/en/imagick.forwardfouriertransformimage.php