public function getImageCount($pageNumber)
    {


        $strURI = Product::$baseProductUri . '/pdf/' . $this->getFileName() . '/pages/' . $pageNumber . '/images';

        $signedURI = Utils::sign($strURI);

        $responseStream = Utils::processCommand($signedURI, 'GET', '', '');

        $json = json_decode($responseStream);

        return count($json->Images->List);
    }