@Michal Muller The OCR API does not have a parameter to pass to ignore values from the result. The only option available is to detect orientation.
The result also depends on the image, It would easy to provide advice if the image could be shared?
I would also suggest to try the read API which is much more accurate in reading any printed or handwritten text in images which runs asynchronously. So, the result needs to be retrieved using the operation id of the actual read call. With this sample image the response seems to detect lines with accuracy which seems to be on expected lines as per image. I hope this helps.