Hacker News Reader

Comment by adontz | Hacker News Reader

User Experience: This app does not open scan dialog immediately, annoying.

Features: This app does not fix perspective distortion.

Office Lens (https://play.google.com/store/apps/details?id=com.microsoft....) is so much better, I get rectangular image without any hints, to say nothing about manually selecting anything.

Office Lens really creates this https://play-lh.googleusercontent.com/AgErNUVn_Jg41jSQO2p2CF... from this https://play-lh.googleusercontent.com/yv6eUY6EyR8x2Hd6NB1SBW... and that is amazing.

View on HN

Office Lens is very good, but huge (> 100MB) and ... pretty proprietary and with some UX quirks. I'd greatly appreciate a FOSS version of it.

If it doesn't fix perspective distortion then in what sense is it a document scanner and not just a camera app?

(Disclaimer, I have not used the app)

Presumably it outputs multiple images combined as a pdf/word as opposed to just images.

I always wanted a tool to place a polygon (even just four corners) and ability to set an aspect ratio (custom or preset like 4:3, 16:9 and A-series) and have perspective fixed image or just move vertices around (just like you expect by having a textured polygon). I would like to have this tool as a part of GIMP and a standard around light image editing tools like many viewers are. Perspective correction tools are either designed for photography or I don't really know how to use them. When you have this you can add edge detection and you're almost done to do this automatically.

I made a simple GUI in python which essentially wraps OpenCV's getPerspectiveTransform/warpPerspective. It let's you select the four corners, chose an aspect ratio and do some simple postprocessing. I was working on edge detection, but it's not working well right now.

I will try to put it on github. EDIT: https://github.com/Dobatymo/dewarp Few years old and very unpolished though

I've been using the Adobe equivalent, and it seems to work pretty well. It's not quite as good as a flatbed scanner, but it does a good-enough job with nothing more than my existing phone.

Still, if there were a better one, I'd use it. Its interface is slightly clunky and it's only so-so with documents that have been folded. Is the MS one any better?

Tried both, Adobe Scan and Office Lens, and liked MS one more, because its default “auto” filter produced more legible documents (better contrast and brigthness) than the Adobe’s “auto”, IMO.

Thanks for the tip!

Reply on news.ycombinator.com