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Enhanced OCR

Posted: Tue Apr 09, 2019 7:27 pm
by MarkusRei

enhanced OCR:

1. did not recognizes the Currency symbol € "Euro" (you find it in *every* invoice in europe)
2. The uppercase letter of the german Umlaut "Ö" is recognized not very often
3. European write the digit "1" always with an upstroke, but the engine often show "1" when slash /., uppercase i, lowercase L, and so on
4. it seems the german dictionary prevents good results. Original word was "öffentlich" ocr makes it to "ordentlich" a complet different word, different characters.

Please improve

Re: Enhanced OCR

Posted: Tue Apr 09, 2019 8:59 pm
by Paul - Tracker Supp
Hi Markus, and welcome to the Tracker Forums.

Thank you for that post. We would indeed like to investigate this. Can you please send us your document for testing please? If it is too large for the forum, you can email it to

If it is even too large for that you can upload it to


Re: Enhanced OCR

Posted: Wed May 29, 2019 12:23 am
by substorm
Just to add to Markus' comments, as shown below, I am also getting pretty poor OCR results even with the latest "Enhanced" version.
I have also attached the same file as PDF for your team to test on your end.
(59.29 KiB) Downloaded 16 times


Re: Enhanced OCR

Posted: Wed May 29, 2019 5:22 pm
by TrackerSupp-Daniel
Hello Substorm,

Thank you for the examples, Looking this over it seems that roughly 95% of the text came out correctly, and after some investigation and testing I found a few reasons for that.

First and foremost, the quality of the image. Note that Optical Character Recognition (OCR) relies heavily on the quality of the image and operates best in the 300-600 dpi range (which most modern scanners are capable of performing). This image is only 143 dpi, with that considered, these results are phenominal.

The second reason is the scan accuracy, the higher the accuracy of a scan, the more likely that artifacts and errors will appear in "imprefect" documents. for one that is below the optimal dpi range, you will almost always want to use the "low accuracy" mode when performing OCR, to achieve the best possible results. Doing this certainly did further improve the character recognition, leaving only one very minor mistake in that the $ in the first column was seen as a capital S.
As you can see, the remainder of the text does indeed match the original.

Finally, regarding the title bar (Apple, book, big, etc.), Note that the Editor currently only fully supports Black on White text during scanning (others can work in many cases, but are not yet fully supported). This is why much of that row was missed, and the portions that were performed changed slightly in appearance. Once again, having a higher quality image would improve this situation significantly.

Kind regards,

Re: Enhanced OCR

Posted: Thu May 30, 2019 6:42 pm
by substorm
Hi Daniel.

Sorry, I don't think I've used the right word by saying "poor". Instead, I should have said that there is some room for improvement, especially with symbols like $ and colored backgrounds. Comparing to the old version of your OCR, this enhanced release is definitely a big jump forward. Hoping to see it one day take the podium by beating Abbyy.


Re: Enhanced OCR

Posted: Thu May 30, 2019 6:53 pm
by TrackerSupp-Daniel
Hello substorm,

We too hope that we can see that kind of improvement in the future. There are always teething trouble with new features like this, and we are certainly doing our best to resolve them as we go. We highly appreciate feedback like this, and will certainly make use of this file for future testing as we work on those features.

Kind regards,