I'm a med student looking for an app that allows OCR of large (~50 page +) pdfs at once. I have thousands of pdfs and I love the ability of searching through all the documents at once with a words search in iannotate. Unfortunately some of the pdfs that I have, the text is not recognized. Is there any way to do this? I know I can take screen shots of each page and then use scanner apps that have OCR, but this is incredibly time consuming. any tips?