Well, sometimes we find image only answers which answers the question and hence obviously we should not delete them as NAA (Not An Answer). These are mostly cases of posting image from a scanned book. Now talking about accepting it, we should certainly ask/recommend OP to provide the content in the form of text or convert it into text.
So, whenever you find image only posted as an answer, add commentask OP to convert it into the text. You may also help OP with conversion process you mentioned in the question e.g Google or Tesseract. BesidesBesides it, also ask OP to add some explanation to the answer since sometimes simply quoting the verse doesn't properly clear what asked in the question. So, it would be useful for a answer to have some explanation to be a good.
You may also flag such answer as low quality so-that it can be drawn into the low quality review queue and reviewers can improve it.