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Frog: OCR Tool for Linux

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Re: Frog: OCR Tool for Linux

#21

Post by cinntaile »

spi wrote: post #16
lasagna_coder wrote: post #13

Earlier quoted context omitted.

What are these projects are you referring to? AFAIK Tesseract is sponsored by Google, from what I understand it is state of the art, ie it is Google OCR. Searching for OCR with OpenCV only reveals using OpenCV with Tesseract, not rolling its own OCR, OpenCV being used to preprocess images to optimise them for Tesseract. Maybe I'm missing something, so I'm interested if you can point me in the right direction.

Google OCR is definitely not the same as Tesseract, although it's true that Tesseract is maintained by Google. Google OCR has definitely much higher accuracy and is significantly faster (basically always taking 1s for inference, while Tesseract can easily take 10s or more for dense pages). Source: I work in developing a competing OCR service and we keep an eye on competition (e.g. aside from Google, solutions by Azur…

I don't get how it's a competing product if it's not available externally? What field is it if you can answer that?

Re: Frog: OCR Tool for Linux

#22

Post by rjzzleep »

tmerse wrote: post #19
rjzzleep wrote: post #10

This looks like a nice app. I was looking for something like this a while back until I noticed that there are "one" liners that can you can setup for a hotkey: #!/usr/bin/env bash langs=(eng ara fas chi_sim chi_tra deu ell fin heb hun jpn kor nld rus tur) lang=$(printf '%s\n' "${langs[@]}" | dmenu "$@") maim -us | tesseract --dpi 145 -l eng+${lang} - - | xsel -bi

Nice! Didn't know about maim. This looks better than what I currently use (found it somewhere on the internet). #!/bin/bash SRC_IMG=$(mktemp -u /tmp/ocr_XXXXXXXXX.png) scrot --select "$SRC_IMG" -q 100 mogrify -modulate 100,0 -resize 400% "$SRC_IMG" tesseract "$SRC_IMG" "$SRC_IMG" &> /dev/null OCR_RESULT=$(cat "$SRC_IMG.txt") echo "$OCR_RESULT" notify-send "$OCR_RESULT" xsel -bi

I mean don't scrot and maim do the same? It can write to stdout as well. Is the resize really worth it?

Re: Frog: OCR Tool for Linux

#23

Post by [deleted] »

recuter wrote: post #20
spi wrote: post #16

Earlier quoted context omitted.

Google OCR is definitely not the same as Tesseract, although it's true that Tesseract is maintained by Google. Google OCR has definitely much higher accuracy and is significantly faster (basically always taking 1s for inference, while Tesseract can easily take 10s or more for dense pages). Source: I work in developing a competing OCR service and we keep an eye on competition (e.g. aside from Google, solutions by Azur…

> Source: I work in developing a competing OCR service and we keep an eye on competition (e.g. aside from Google, solutions by Azure, Amazon, Abbyy, Nuance, Cloudmersive, etc., as well as our internal product of course, which is not available externally), and they are (almost) all significantly better on Tesseract. Great. How do you quantify it and keep track? Is there an industry standard benchmark? Would you consid…

[deleted]

Re: Frog: OCR Tool for Linux

#24

Post by ce4 »

recuter wrote: post #2

Appears to be a nice wrapper around Tesseract: https://github.com/tesseract-ocr/tessdata https://en.wikipedia.org/wiki/Tesseract_(software) The demo of course works perfectly on a Mac as this is already built into Ventura. If you haven't experienced it yet ye olde ctrl-f now seamlessly sneaks a peak into images on the page for example, surprisingly useful. In November 2020, Brewster Kahle from the Internet Archive pr…

I use https://kebekus.gitlab.io/scantools for scanning, it builds on top of tesseract and works great for pdf enhancements

Re: Frog: OCR Tool for Linux

#25

Post by rjzzleep »

spi wrote: post #16
lasagna_coder wrote: post #13

Earlier quoted context omitted.

What are these projects are you referring to? AFAIK Tesseract is sponsored by Google, from what I understand it is state of the art, ie it is Google OCR. Searching for OCR with OpenCV only reveals using OpenCV with Tesseract, not rolling its own OCR, OpenCV being used to preprocess images to optimise them for Tesseract. Maybe I'm missing something, so I'm interested if you can point me in the right direction.

Google OCR is definitely not the same as Tesseract, although it's true that Tesseract is maintained by Google. Google OCR has definitely much higher accuracy and is significantly faster (basically always taking 1s for inference, while Tesseract can easily take 10s or more for dense pages). Source: I work in developing a competing OCR service and we keep an eye on competition (e.g. aside from Google, solutions by Azur…

> The only domain where Tesseract is competitive is for perfect "black text on white paper", it gives pretty poor performance when dealing with colored, distorted text, or even strong page structure effects (tables, etc.).

I wouldn't be surprised if their data set is bigger than the stock tesseract, but part of the OCR process is to preprocess the images.

Re: Frog: OCR Tool for Linux

#26

Post by mavu »

I probably shouldn't but I dislike using libraries for the main part of your project and then not even mentioning that you are using them.

Seems dishonest to me, but maybe I'm just too strict.

Re: Frog: OCR Tool for Linux

#27

Post by rjzzleep »

ce4 wrote: post #24
recuter wrote: post #2

Appears to be a nice wrapper around Tesseract: https://github.com/tesseract-ocr/tessdata https://en.wikipedia.org/wiki/Tesseract_(software) The demo of course works perfectly on a Mac as this is already built into Ventura. If you haven't experienced it yet ye olde ctrl-f now seamlessly sneaks a peak into images on the page for example, surprisingly useful. In November 2020, Brewster Kahle from the Internet Archive pr…

I use https://kebekus.gitlab.io/scantools for scanning, it builds on top of tesseract and works great for pdf enhancements

You might be interested in https://github.com/ocrmypdf/OCRmyPDF then.

It does quite some preprocessing on the PDF pages before passing it on to tesseract.

Re: Frog: OCR Tool for Linux

#28

Post by seltzered_ »

Oh nice. There hasn't been a good ocr screenshot tool with Wayland support yet so look forward to trying this. IIRC there's been..

Linux: dpScreenOCR - x11 only last I checked in and now Frog

MacOS: screenotate, prizmo

Windows: screenotate

I don't get all the nitpick comments. OCR tools like this are extremely useful when dealing with excerpting text from certain websites (slack) or taking class notes from video.

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