protected static function handleImg($id) {
        $img = new \Imagick(Config::get('CAPTCHA_PIC_PATH').$id);
        $img->swirlImage(mt_rand(15, 25));
        $img->motionBlurImage(1.5, 3, mt_rand(0, 360));
        $img->adaptiveResizeImage(Config::get('CAPTCHA_WIDTH'), Config::get('CAPTCHA_HEIGHT'), false);
        $img->addNoiseImage(\Imagick::NOISE_GAUSSIAN, \Imagick::CHANNEL_ALL);
        $img->writeImage(Config::get('CAPTCHA_PIC_PATH').$id);
    }