Manually call Haar features / LBP

Hi, Is it possible to manually call the haar feature / local binary pattern function at a specific scale once ? I know of detectMultiScale but it does the haar feature in a sliding window manner at multiple scales. Given an image id like to call the function on it once **if** I know the scale instead of evaluating it at different scales and positions. Also, how do I see the score for the haar features at the current window ? Thanks