B4i Library iTesseract- Simple OCR

Name: iTesseract

Version: 1.02

Description: iTesseract is a wrapper of the Tesseract IOS Framework and allows you to recognize text from images (OCR- optical character recognition).

License:

• Tesseract-OCR-iOS: https://github.com/gali8/Tesseract-OCR-iOS/blob/master/LICENSE.md (MIT License)
• Original Tesseract project, maintained by Google: https://github.com/tesseract-ocr/tesseract#introduction (Apache 2.0 license)

Notes/Tips:

• for the recognition you need language files. Download all files of your language here: https://github.com/tesseract-ocr/tessdata and put them into your "Files" folder (asset directory)
• not all EngineModes are available for all languages (see also the logs)
• rename ".lm" file extensions to ".yy", for example: eng.cube.lm ---> eng.cube.yy
  
• currently you can't cancel the recognition in the last 10% of the operation
• for a documentation use one of the B4X object browser: https://www.b4x.com/android/forum/t...j-api-documentation-b4x-object-browser.25682/ or https://www.b4x.com/android/forum/threads/b4x-help-viewer.46969

Download from Dropbox:

• Library.zip: http://bit.ly/2xs8ngq

• Example.zip: http://bit.ly/2pdEUTP

Please let me know if you need more features and feel free to ask questions

 

[imbault]

Thanks, looks interesting, but where is your lib?

 

[JanPRO]

Upps I added the link

 

[Erel]

Thank you for sharing. The library was uploaded to the hosted builders.

 

[joilts]

Thanks, it looks great.
One rookie question... I´m trying to run the example you posted on my iPad. This is the error code:

Error copying file: Error Domain=NSCocoaErrorDomain Code=260 "The operation couldn’t be completed. (Cocoa error 260.)" UserInfo=0x1577e470 {NSFilePath=/private/var/mobile/Containers/Data/Application/
91E112BB-83AE-4EF1-9C99-EC6613C81F66/tmp/virtual_assets/deu-frak.traineddata,
NSUnderlyingError=0x1577e3e0 "The operation couldn’t be completed. No such file or directory"}

Can you help me with this one? Do I have to copy files ? I saw your notes/tips but didn´t get what to do.

Thanks in advance,

 

[JanPRO]

I see this error too, probably it's a bug related to the new B4i or iOS version. I will fix it

 

[JanPRO]

No,
I don't know why, but deu-frak.traineddata was renamed to deu_frak.traineddata. So just replace

Dim DataList As List = Array As String("deu.traineddata","deu-frak.traineddata","osd.traineddata")

with

Dim DataList As List = Array As String("deu.traineddata","deu_frak.traineddata","osd.traineddata")

And it will work

 

[joilts]

Hi to all,

Have a new problem here, see if any of you can help.
I'm using this lib and it works very well in debug mode.
If a generate a "clean" release mode app, I get an error, about missing file or directory:

Available EngineModes for your language:
Error copying file: Error Domain=NSCocoaErrorDomain Code=260 "The file ?pla.trai
neddata? couldn?t be opened because there is no such file." UserInfo={NSFilePath
=/private/var/mobile/Containers/Data/Application/4EC62672-4723-49FB-98D4-FFC7DE7
3516C/tmp/virtual_assets/pla.traineddata, NSUnderlyingError=0x17f2a860 {Error Do
main=NSPOSIXErrorDomain Code=2 "No such file or directory"}}

Stack Trace: (
  CoreFoundation       <redacted> + 150
  libobjc.A.dylib      objc_exception_throw + 38
  CoreFoundation       <redacted> + 0
  SITCARGA             -[B4IFile Copy::::] + 716
  SITCARGA             -[iTesseract Initilize::::::] + 1212
  SITCARGA             -[b4i_anpr _initialize:::] + 648
  SITCARGA             -[b4i_associate_screen _lookforphoto:] + 1452
  SITCARGA             -[b4i_associate_screen _returnfromcrop:] + 198
  SITCARGA             -[b4i_crop_plate_screen _btassociar_click] + 1320
  CoreFoundation       <redacted> + 68
CoreFoundation       <redacted> + 292
SITCARGA             +[B4I runDynamicMethod:method:throwErrorIfMissing:args:] +

By "clean" I mean to uninstall the "debug mode app" and then install "release mode" app. If I do "release mode" installation without removing the "debug mode first", everything work fine. I don´t know if it´s related or just a coincidence.
I saw this thread "Directory in Special folder" and I think it´s related to this problem. I use remote host to compile my app as I do not have a Mac to do so. It may be a problem using this lib? Is there a way to solve this?
My concern is if this can happens to my app after upload to Apple Store.

Thank you all for your time.

 

[JanPRO]

Hi,
Do you have set DebugMode to False when you have initialized OCR?

Jan

(Off-Topic: I saw I have made a spelling mistake: "Initilize" )

 

[joilts]

Hi,
Do you have set DebugMode to False when you have initialized OCR?

Thanks for your time. Sorry for my mistake. Didn't notice this parameter in Initialize method.
All working now, ready to go.

 

[hanyelmehy]

Hi,
when try to BUILD i get this error message

Error: ** BUILD FAILED **


The following build commands failed:
    Lex eng.cube.lm
(1 failure)

 

[JanPRO]

Hi, currently I don't have much time for B4X, but I hope I will find some time to check this.

Jan

 

[JanPRO]

hanyelmehy, I hope it's not too late, but can you upload an example project?

Jan

 

[hanyelmehy]

hanyelmehy, I hope it's not too late, but can you upload an example project?

Jan

Hi,
Thank you for your answer ,i use same code you make ,the only change is language (i use English)

 

[JanPRO]

Hi,
be sure, you have put all english tesseract files in to the Files folder:

for the recognition you need language files. Download all files of your language here: https://github.com/tesseract-ocr/tessdata and put them into your "Files" folder (asset directory)

Jan

 

[hanyelmehy]

Hi,
be sure, you have put all english tesseract files in to the Files folder:


Jan

i include all files
please check

Dim DataList As List = Array As String("eng.cube.bigrams","eng.cube.fold","eng.cube.lm","eng.cube.nn","eng.cube.params","eng.cube.size","eng.cube.word-freq","eng.tesseract_cube.nn","eng.traineddata","osd.traineddata")
        iOCR.Initilize(True,"iOCR",DataList,File.DirDocuments,"eng")
        iOCR.MaximumRecognitionTime = 60
        iOCR.EngineMode=iOCR.EngineModeTesseractOnly

 

[JanPRO]

Mmhh, the DataList looks good.
Are you using the HostedBuilder?
Although it seems that your project is fine, please upload it (with the tesseract files) or a example which demonstrates the issue.

Jan

 

[hanyelmehy]

Mmhh, the DataList looks good.
Are you using the HostedBuilder?
Although it seems that your project is fine, please upload it (with the tesseract files) or a example which demonstrates the issue.

Jan

i use local builder
project with tesseract files well be big (i use same files in Original Tesseract project)
Note project work in debug mode ,error show when try to BUILD only
Thank you

 

[JanPRO]

Note project work in debug mode ,error show when try to BUILD only

Ahh ok, now I see the error too.
It's a bug in the library, I will fix it.

Jan

 

[JanPRO]

Update v. 1.01

Changes:

• the method Initilize was renamed to Initialize
• bug fix (thanks to hanyelmehy)

Very important: please rename ".lm" file extensions to ".yy", for example: eng.cube.lm ---> eng.cube.yy

You can find the new version in the start post.

Jan