Question

QF-Zone OCR not working for lower DPI

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Updated February 1, 2019

asked on January 29, 2019

Hello,

We have a customer who is using a QF Session that is accessed by more than one user.

If one of the users scan images in the Zone OCR works. We have noticed they are scanning at 300dpi.

Another user scans images and the Zone OCR fails. We see these documents are set at 200dpi.

Do we need to let the customer know that 300dpi is the standard and not to go below that or is there a way to tweak the Zone OCR to recognize both?

I did try changing the settings from Pixel to Percentage and that did not work.

Thanks for any feedback,

Jeff Curtis

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Replies

replied on January 30, 2019 • Show version history

If the resolution of the pages being scanned are not in your control, and the documents could be 200 or 300 dpi, then another option would be to reconfigure your Zone OCR process to have the zones based on percentage rather than pixels.

*Edit*

Sorry, I didn't realize you said that the zone OCR region to using "percent" did not work for you. Can you clarify what you mean by "did not work"? I have a simple QF session setup where this works for me in the basic case. Perhaps you can open a support case and provide a copy of your session and sample documents so further investigation can be done.

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replied on January 31, 2019

Unfortunately, it is just a fact of life that a 300 DPI image will have much more accurate OCR results than one that is 200 DPI.

You need to stress to your users that for the process to work, they need to scan at 300 DPI.

Am I saying that it can't/won't work at 200 DPI? No, but only that the OCR results on a 200 DPI image are often much less accurate than a 300 DPI image. Therefore, if you are relying on OCR as part of your process, you want to use an image resolution that will give you more accurate OCR results.

To show yourself the difference, (using just the LF Client Scanning) scan some pages at 200 DPI into one document and then scan the same pages at 300 DPI into another. Then OCR them both and compare the text layers.

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replied on February 1, 2019

Something to also keep in mind is retention laws. In some locales, in order for an electronic document to be considered a Record, there is a minimum DPI that you need to take into account.

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replied on January 30, 2019 • Show version history

I'd recommend that you make sure that all users are scanning at the same DPI, regardless of what you pick. That said, 300 DPI is standard for most printed materials in an office setting. It makes sense to also scan at that resolution.

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QF-Zone OCR not working for lower DPI

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