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Show HN: OpenScan – open-source document scanner app

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Re: Show HN: OpenScan – open-source document scanner app

#11

Post by adontz »

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.

Re: Show HN: OpenScan – open-source document scanner app

#12

Post by vzaliva »

It is nice start, but cropping function is pretty much not working. When scanning with the phone the page is rarely properly alighned ans cropping step should be automatic (like with CamScan). Even if performing it manually under perfect conditions (white page on back background) it fails to detect page boundaries. Screenshot: https://www.dropbox.com/s/cpvdidugiy7n3lk/Screenshot_2021010...

Re: Show HN: OpenScan – open-source document scanner app

#13

Post by _odey »

I've used OpenNoteScan before:

* https://f-droid.org/en/packages/com.todobom.opennotescanner/

* https://github.com/allgood/OpenNoteScanner

It works OK but it looks a bit old, and you need to install OpenCV Manager separately, outside of F-Droid for it to work.

I can deal with it, but there's no way I could ever be able to convince anybody else, especially non-tech people to use it.

This one looks like a winner in terms of UX, so I'll be using it from now on, Thank you for creating it!

Re: Show HN: OpenScan – open-source document scanner app

#14

Post by jabberwcky »

Quick take: this is staying on my phone, great effort :)

Notes:

- Doesn't keep flash permanently on (like CamScanner)

- Skew correction looks maybe worse quality (than CamScanner)

- Totally fine for at least 80% of the things I'd use CamScanner for. Super well done!

Re: Show HN: OpenScan – open-source document scanner app

#15

Post by solarkraft »

adontz wrote: post #11

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... f…

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.

Re: Show HN: OpenScan – open-source document scanner app

#16

Post by pinusc »

My first instinct is to compare this to OpenNoteScanner, the only other quasi-functioning FOSS note scanning app.

The UI here is significantly more polished and better. The only thing OpenNoteScanner does better is that it starts in camera mode, and therefore the workflow is a bit faster.

However, feature-wise this is seriously lacking. I would not consider using this until it can automatically crop and correct perspective distortion.

Also the default filters are seriously lacking. Either make them smarter or give the user more control (e.g. for B/W allow setting the threshold, even for decently-lit documents I get poor results with random black areas)

You can do both by integrating with OpenCV. No idea how easy it is to integrate it with flutter though...

Anyways, good job! I'll keep following the project and might consider contributing if you ever start working on these features.

Re: Show HN: OpenScan – open-source document scanner app

#19

Post by mighty3xodus »

pinusc wrote: post #16

My first instinct is to compare this to OpenNoteScanner, the only other quasi-functioning FOSS note scanning app. The UI here is significantly more polished and better. The only thing OpenNoteScanner does better is that it starts in camera mode, and therefore the workflow is a bit faster. However, feature-wise this is seriously lacking. I would not consider using this until it can automatically crop and correct persp…

Thank you for the suggestions! I will for sure take it into consideration.

The scanner itself is from another open source project, the only one which was a viable option. I'll have to look into OpenNoteScanner's scanner if I were to improve mine. Seems people are happy with the edge detection it offers.

Thank you :)

Re: Show HN: OpenScan – open-source document scanner app

#20

Post by hawski »

adontz wrote: post #11

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... f…

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.
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