public function getAspectRatio()
 {
     $ratio = parent::getAspectRatio();
     if (!empty($this->interfaceObj[0])) {
         list($width, $height) = explode('x', $this->interfaceObj[0]);
     }
     if (!empty($width) && !empty($height)) {
         $ratio = $width / $height;
     }
     return $ratio;
 }