Imagick::forwardFourierTransformImage

Implements the discrete Fourier transform (DFT)

&reftitle.description; public `bool` `Imagick::forwardFourierTransformimage` `bool` `magnitude`

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

&reftitle.parameters;

`magnitude`

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

&reftitle.returnvalues;

&imagick.return.success;

&reftitle.examples;

### `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();
    }

    ?>