Will this automatically center and apply perspective transforms to pictures taken with phone cameras?
Not at the moment. I'm guessing this information is available in the EXIF properties?
No. It requires opencv and image processing
Show HN: Open Paperless – Scan, index, and archive paper documents
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Re: Show HN: Open Paperless – Scan, index, and archive paper documents
#12Will this automatically center and apply perspective transforms to pictures taken with phone cameras?
Not at the moment. I'm guessing this information is available in the EXIF properties?
It's a little bit more tricky than that. What the EXIF might tell you is the camera calibration parameters like focal length, distortion, perspective center, etc. That can be used to fix systematic errors in images like pincushion/barrel distortion.
To unwarp photos that were taken at odd angles you need to do some image processing. The mathematics aren't particularly difficult, it's a homography transform in most cases (rectangles). The problem is robustly detecting the page.
Dropbox has some nice write-ups on this: https://blogs.dropbox.com/tech/2016/08/fast-document-rectifi...
Re: Show HN: Open Paperless – Scan, index, and archive paper documents
#13Earlier quoted context omitted.
Not at the moment. I'm guessing this information is available in the EXIF properties?
It's a little bit more tricky than that. What the EXIF might tell you is the camera calibration parameters like focal length, distortion, perspective center, etc. That can be used to fix systematic errors in images like pincushion/barrel distortion. To unwarp photos that were taken at odd angles you need to do some image processing. The mathematics aren't particularly difficult, it's a homography transform in most ca…
Thanks for the link. That blew my mind! I wish it could be added would, my phone would replace my scanner instantly.
Re: Show HN: Open Paperless – Scan, index, and archive paper documents
#14Earlier quoted context omitted.
It's a little bit more tricky than that. What the EXIF might tell you is the camera calibration parameters like focal length, distortion, perspective center, etc. That can be used to fix systematic errors in images like pincushion/barrel distortion. To unwarp photos that were taken at odd angles you need to do some image processing. The mathematics aren't particularly difficult, it's a homography transform in most ca…
Thanks for the link. That blew my mind! I wish it could be added would, my phone would replace my scanner instantly.
Also see this for more implementation details: https://www.pyimagesearch.com/2014/09/01/build-kick-ass-mobi...
This could be done server side if you're already doing ocr.
Re: Show HN: Open Paperless – Scan, index, and archive paper documents
#15Will this automatically center and apply perspective transforms to pictures taken with phone cameras?
Not at the moment. I'm guessing this information is available in the EXIF properties?
The most complicated implementation I've seen has been Office Lens, which also corrects distortion and does edge detection.
Re: Show HN: Open Paperless – Scan, index, and archive paper documents
#16Earlier quoted context omitted.
Thanks for the link. That blew my mind! I wish it could be added would, my phone would replace my scanner instantly.
Also see this for more implementation details: https://www.pyimagesearch.com/2014/09/01/build-kick-ass-mobi... This could be done server side if you're already doing ocr.
Wow this looks awesome, thank you!
Re: Show HN: Open Paperless – Scan, index, and archive paper documents
#17I’ve been looking at “document management” software both open source and commercial for a very long time. Every one of them sucks. Are they powerful? Maybe. But their interfaces suck. Dependencies are out of control. Managing the app and it’s dependecnies are insanely time consuming. You want a product that scales, has a decent UI and the only way to get that is to make it simple. Also I require the “library” file to be stored on a network server not locally. The only app I have found to do these things is CDfinder. Everything else takes to much work to install, upgrade and maintain. Not to mention being too complex to reasonably manage, tag and search your photos, documents and digital data.
Re: Show HN: Open Paperless – Scan, index, and archive paper documents
#18Let's put this in a room with [The Screenless Office]( https://news.ycombinator.com/item?id=15960056 ) and see what happens.
Is that the one where you scan a barcode and they mail you a printout of a web page ?
Re: Show HN: Open Paperless – Scan, index, and archive paper documents
#19Something I've wanted that might be possible is software that takes in a video of me flipping the pages of a notebook and converts that to a PDF of the notebook.
Re: Show HN: Open Paperless – Scan, index, and archive paper documents
#20I have a question Is there a service anyone knows about which will print your email and send it with tracking of receipt or signature, so you can prove what was physically sent? Or you mail it to them and they open your mail, scan it and forward it on with signature required, with your address as the return address? Because righy now you can only prove that the ENVELOPE was received, not what was in it.
you can just ask your recipeint to send you some uuid on the letter after they receive it. i have no idea what problem you are trying to solve though.