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    <p>The simplest approach would be to use a single tool such a ABBYY FineReader, Omnipage etc to process the images in one batch without having to sort them out into scanned vs not scanned images. I believe FineReader converts the PDF's to images before performing OCR anyway.</p> <p>Using an OCR engine will give you features such as automatic deskew, page orientation detection, image thresholding, despeckling etc. These are features you would have to buy an image processng library for and program yourself and it could prove difficult to find an optimal set of parameters for your 10,000 PDF's.</p> <p>Using the automatic OCR approach will have other side effects depending on the input images and you would find you would get better results if you sorted the images and set optimal parameters for each type of images. For accuracy it would be much better to use a proper PDF text extraction routine to extract the PDF's that have perfect text.</p> <p>At the end of the day it will come down to time and money versus the quality of the results that you need. At the end of the day, a commercial OCR program will be the quickest and easiest solution. If you have clean text only documents then a cheap OCR program will work as well as an expensive solution. The more complex your documents, the more money you will need to spend to process them.</p> <p>I would try finding some demo / trial versions of commercial OCR engines and just see how they perform on your different document types before spending too much time and money.</p>
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