Auto straightening images
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ben-cyanfish
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My scanning software (Brother 6940CW) doesn't seem to support this automatically. Have you given any thought to adding an automatic deskew feature? Not trivial I realize but useful.
Are there any open source tools that can straighten scanned pages (of text)?
Try ScanTailor: http://scantailor.org/
I have just implemented the first working alpha version of an auto-deskew feature for Naps2 in a fork on my github. Algo does already work quite fine. Planning on making it available for auto-application on new scans and in the command line version, before issuing my final PR for it being integrated into the main Naps2 version.
I do so look forward to auto-deskew. For whatever reason, my Brother MFC-9970CDW printer/scanner/copier puts in about 1.5 degrees of skew when scanning through its document feeder. Its document feeder has the ability to scan both sides of a page simultaneously, and when it does, scans of the top and bottom sides of a page have the same skew magnitude of about 1.5 degrees but in opposite rotational directions.
Hi, when do we get the deskew function? It is also so important to me,
Peter. Would love to hear an update on your change.
This has been implemented in NAPS2 5.4.0. You can do it manually from the Rotate menu, or set it on your profile under Advanced.
This is great news. Is there any way to control how how agressively the deskew works? I have some pages that are all about 0.7 degrees skewed. This is visible to my eye as they contain lots of tables with vertical line borders but I can imagine that the algorithm is perhaps tuned for more extreme cases than this.
Last edit: Tony Jones 2017-11-08
I opened a ticket as there are issues when trying to deskew. I imported 192 jpegs I'd exported out of naps and tried to deskew them. Several issues.
https://sourceforge.net/p/naps2/tickets/364/