Hi Abirami,
Decipher's really just designed for extracting written data from documents, not so much determining the image quality or comparing documents.
We have had a look at way to determine image quality, but you would face a challenge with PDF's as the dpi does not necessarily indicate a high quality image.
You may need to think outside the box on this one, as it certainly sound like an interesting use case.
Thanks
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Ben Lyons
Product Consultant
Blue Prism
UK
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Ben Lyons
Principal Product Specialist - Decipher
SS&C Blue Prism
UK based