Tesseract convert image to gibberish

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Dusayanta Prasad

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Feb 25, 2018, 2:44:42 PM2/25/18
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I am try to convert the below image using Tesseract in linux using the following command:

tesseract img.jpg out -l eng

and i am getting the result like this



Please help me out.


Zdenko Podobny

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Feb 25, 2018, 2:46:38 PM2/25/18
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Zdenko

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ShreeDevi Kumar

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Feb 25, 2018, 4:18:32 PM2/25/18
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which version of tesseract are you using?

See attached results with Tesseract 4 and eng from tessdata_fast



ShreeDevi
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भजन - कीर्तन - आरती @ http://bhajans.ramparivar.com

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eng-skewed.txt

Greg Dunkel

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Feb 26, 2018, 1:57:02 AM2/26/18
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Probably the scan is at too low dpi.  Also slightly skewed.

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Dusayanta Prasad

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Feb 26, 2018, 7:15:16 PM2/26/18
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Can you please send me the link for Tesseract 4?
Tell me the method you used to perform the OCR


On Sunday, February 25, 2018 at 9:48:32 PM UTC+5:30, shree wrote:
which version of tesseract are you using?

See attached results with Tesseract 4 and eng from tessdata_fast



ShreeDevi
____________________________________________________________
भजन - कीर्तन - आरती @ http://bhajans.ramparivar.com

On Sun, Feb 25, 2018 at 8:16 PM, Zdenko Podobny <zde...@gmail.com> wrote:
2018-02-25 11:38 GMT+01:00 Dusayanta Prasad <dusayan...@gmail.com>:

I am try to convert the below image using Tesseract in linux using the following command:

tesseract img.jpg out -l eng

and i am getting the result like this



Please help me out.


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Dusayanta Prasad

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Feb 26, 2018, 7:44:20 PM2/26/18
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I am using tesseract in ubuntu command line, the version is 
tesseract 3.04.01
 leptonica-1.73
  libgif 5.1.2 : libjpeg 8d (libjpeg-turbo 1.4.2) : libpng 1.2.54 : libtiff 4.0.6 : zlib 1.2.8 : libwebp 0.4.4 : libopenjp2 2.1.0

Regarding the part of gibberish text, i had to convert the image to .tif format . Then i used tesseract with the .tif image as:
tesseract img.tif outtif
The text generated in my case has notable difference from yours. Your one's has a good accuracy. Please tell me how did u achieved so.
Have a look at the text file attachment

On Sunday, February 25, 2018 at 9:48:32 PM UTC+5:30, shree wrote:
which version of tesseract are you using?

See attached results with Tesseract 4 and eng from tessdata_fast



ShreeDevi
____________________________________________________________
भजन - कीर्तन - आरती @ http://bhajans.ramparivar.com

On Sun, Feb 25, 2018 at 8:16 PM, Zdenko Podobny <zde...@gmail.com> wrote:
2018-02-25 11:38 GMT+01:00 Dusayanta Prasad <dusayan...@gmail.com>:

I am try to convert the below image using Tesseract in linux using the following command:

tesseract img.jpg out -l eng

and i am getting the result like this



Please help me out.


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outtif.txt

ShreeDevi Kumar

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Feb 27, 2018, 4:25:18 AM2/27/18
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You can download latest version of tesseract-ocr and appropriate traineddata from 


I ran tesseract via command line with default values.


You may need to remove the existing old version, before installing new.

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Dusayanta Prasad

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Mar 3, 2018, 9:39:50 AM3/3/18
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What if i build Leptonica and Tesseract from source following the method on GitHub??

shree

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Mar 3, 2018, 10:08:07 AM3/3/18
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Sure, if you are comfortable building software on Linux. You have to make sure you have all the dependencies etc.

Dusayanta Prasad

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Mar 3, 2018, 10:29:41 AM3/3/18
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Please tell me one more thing. Before feeding the image to tesseract do you perform any kind of pre-processing like binarising the image  or something like that?
I didn't get the same result as yours even after trying Tesseract 4 with eng tessdata_best.
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Dusayanta Prasad

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Mar 3, 2018, 12:27:11 PM3/3/18
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Please help with this:

dusayanta@dusayanta:~/tessy$ tesseract -v
tesseract 4.00.00dev-731-gb9b08c7
 leptonica-1.75.3
  libjpeg 8d (libjpeg-turbo 1.4.2) : libpng 1.2.54 : libtiff 4.0.6 : zlib 1.2.8

 Found AVX
 Found SSE


dusayanta@dusayanta:~/tessy$ tesseract book.tif book -l eng
Error opening data file /home/dusayanta/tesseract/tessdata/eng.traineddata
Please make sure the TESSDATA_PREFIX environment variable is set to your "tessdata" directory.
Failed loading language 'eng'
Tesseract couldn't load any languages!
Could not initialize tesseract.
dusayanta@dusayanta:~/tessy$ cd ..
dusayanta@dusayanta:~$ ls tesseract/tessdata/
configs  eng.traineddata  eng.user-patterns  eng.user-words  Makefile.am  Makefile.in  pdf.ttf  tessconfigs

dusayanta@dusayanta:~$ printenv
XDG_VTNR=7
XDG_SESSION_ID=c2
CLUTTER_IM_MODULE=xim
XDG_GREETER_DATA_DIR=/var/lib/lightdm-data/dusayanta
SESSION=ubuntu
GPG_AGENT_INFO=/home/dusayanta/.gnupg/S.gpg-agent:0:1
SHELL=/bin/bash
TERM=xterm-256color
VTE_VERSION=4205
QT_LINUX_ACCESSIBILITY_ALWAYS_ON=1
TESSDATA_PREFIX=/home/dusayanta/tesseract/tessdata/
WINDOWID=75497482
UPSTART_SESSION=unix:abstract=/com/ubuntu/upstart-session/1000/1099
GNOME_KEYRING_CONTROL=
GTK_MODULES=gail:atk-bridge:unity-gtk-module
USER=dusayanta

ShreeDevi Kumar

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Mar 3, 2018, 12:28:38 PM3/3/18
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No, I had not pre-processed the iame.

I used tessdata_fast NOT tessdata_best.​

ShreeDevi
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भजन - कीर्तन - आरती @ http://bhajans.ramparivar.com

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ShreeDevi Kumar

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Mar 3, 2018, 12:53:03 PM3/3/18
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ls -l  /home/dusayanta/tesseract/tessdata/eng.traineddata

combine_tessdata -d /home/dusayanta/tesseract/tessdata/eng.traineddata


ShreeDevi
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भजन - कीर्तन - आरती @ http://bhajans.ramparivar.com

ShreeDevi Kumar

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Mar 3, 2018, 12:55:40 PM3/3/18
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Also check 

tesseract --list-langs

ShreeDevi
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भजन - कीर्तन - आरती @ http://bhajans.ramparivar.com

ShreeDevi Kumar

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Mar 3, 2018, 12:56:58 PM3/3/18
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The exact directory will depend both on the type of training data, and your Linux distribtion. Possibilities are /usr/share/tesseract-ocr/tessdata or /usr/share/tessdata or /usr/share/tesseract-ocr/4.00/tessdata.

ShreeDevi
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भजन - कीर्तन - आरती @ http://bhajans.ramparivar.com

Dusayanta Prasad

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Mar 3, 2018, 5:57:33 PM3/3/18
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Which produces the better result- tessdata_fast or tessdata_best?
Also check 

tesseract --list-langs
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ShreeDevi Kumar

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Mar 3, 2018, 6:15:20 PM3/3/18
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Recommendation from Ray is to use tessdata_fast



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