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

 

[cloner7801]

I get error when I run project

b4i_main.m:53:13: error: no visible @interface for 'iTesseract' declares the selector 'Initialize::::::'
[self._iocr Initialize:self.bi :[self.__c True] :@"iOCR" :(NSArray*)((_datalist).object) :[[self.__c File] DirDocuments] :@"deu"];
~~~~~~~~~~ ^~~~~~~~~~
1 error generated.


Error: ** BUILD FAILED **


The following build commands failed:
    CompileC build/B4iProject.build/Release-iphoneos/B4iProject.build/Objects-normal/armv7/b4i_main.o B4iProject/b4i_main.m normal armv7 objective-c com.apple.compilers.llvm.clang.1_0.compiler
(1 failure)

 

[JanPRO]

Hi,
you are using hosted builder, right?

I just saw that Erel didn't upload the newest version 1.01 to the builder, so ( @Erel ) uploading the new version should solve the issue ...

Jan

 

[cloner7801]

Hi,
you are using hosted builder, right?

I just saw that Erel didn't upload the newest version 1.01 to the builder, so ( @Erel ) uploading the new version should solve the issue ...

Jan

Yes , I use hosted builder

@Erel , please upload new version

 

[tufanv]

@Erel yes is it possible that you can upload the new verison ? it does not work here..

 

[Erel]

I've uploaded the library files (without the framework).

 

[tufanv]

Hi,
you are using hosted builder, right?

I just saw that Erel didn't upload the newest version 1.01 to the builder, so ( @Erel ) uploading the new version should solve the issue ...

Jan

Dear Jan,

I deleted all other trainedata and just downloaded and added tur.trainedata to files folder.
Than changed the line to
Dim DataList As List = Array As String("tur.traineddata")

but my phone still can recognie the german poem. How is it possible ?

 

[JanPRO]

You have to change also the Initialize line.
However you are right, the result with the turkish traineddata is quite good.

I don't know how the recognition process works, but one reason might be the fact, that turkish and german characters are nearly the same ...

Jan

 

[tufanv]

I understand Thanks Jan !

 

[tufanv]

You have to change also the Initialize line.
However you are right, the result with the turkish traineddata is quite good.

I don't know how the recognition process works, but one reason might be the fact, that turkish and german characters are nearly the same ...

Jan

one more question. Turkish has only trainedata file while english has many files. Does it increase the accuruacy or what is the difference ?

 

[JanPRO]

Does it increase the accuruacy

Yes, when you have more language files, you can also choose EngineModeCubeOnly as EngineMode which is more accurate, but slower.

Jan

 

[tufanv]

Ah understood Thanks. So maybe as Turkish file could read German, We can use English cube for Turkish =)

 

[tufanv]

Dear Jan,

One last question: In the url you specified , I only found traineddata file for turkish. Later i searched theinternet and found this link :https://github.com/tesseract-ocr/langdata/tree/master/tur

it says it is for 3.04 and the file extensions are very different than you use. Is it a newer one or what is it ? I tried to add them to files but it did not make any difference becaue only teserractonly engine mode is available ..

Yes, when you have more language files, you can also choose EngineModeCubeOnly as EngineMode which is more accurate, but slower.

Jan

 

[JanPRO]

Hi,

it says it is for 3.04

The library is a wrapper for Tesseract 3.03.

Jan

 

[tufanv]

Hi,

The library is a wrapper for Tesseract 3.03.

Jan

Ah, so i wont be able to use them. Ok Thanks very much for info.

 

[fbritop]

Not sure if this library is still at the hosted builder, but at init it breaks with:

-----
Available EngineModes for your language:
- EngineModeTesseractOnly
-----
Tesseract destination path: /var/mobile/Containers/Data/Application/A37035F3-9B0C-4B57-A17D-13FE8E37D69A/Library/Caches/var/mobile/Containers/Data/Application/A37035F3-9B0C-4B57-A17D-13FE8E37D69A/Documents/tessdata
SignalHandler 6
Error occurred on line: 104 (aadminnotificationsvisits)
Signal - 6
Stack Trace: (
    "0   LlaveMovil.com       SignalHandler + 120",
    "1   libsystem_platform.dylib            0x00000001befd29ec <redacted> + 40",
    "2   libsystem_pthread.dylib             0x00000001befd8094 <redacted> + 380",
    "3   libsystem_c.dylib    abort + 140",
    "4   LlaveMovil.com       _Z19ExtractBlobFeaturesRK19FEATURE_DEFS_STRUCTRK6DENORMS4_RK20INT_FX_RESULT_STRUCTP5TBLOB + 0",
    "5   LlaveMovil.com       _ZN9tesseract15TessdataManager4InitEPKci + 204",
    "6   LlaveMovil.com       _ZN9tesseract9Tesseract24init_tesseract_lang_dataEPKcS2_S2_NS_13OcrEngineModeEPPciPK13GenericVectorI6STRINGESA_b + 208",
    "7   LlaveMovil.com       _ZN9tesseract9Tesseract23init_tesseract_internalEPKcS2_S2_NS_13OcrEngineModeEPPciPK13GenericVectorI6STRINGESA_b + 48",
    "8   LlaveMovil.com       _ZN9tesseract9Tesseract14init_tesseractEPKcS2_S2_NS_13OcrEngineModeEPPciPK13GenericVectorI6STRINGESA_b + 376",
    "9   LlaveMovil.com       _ZN9tesseract11TessBaseAPI4InitEPKcS2_NS_13OcrEngineModeEPPciPK13GenericVectorI6STRINGESA_b + 276"
)

 

[Erel]

I've uploaded the library to the new builders.

If using a local builder then you need to modify the h file and change #import "iCore.h" to #import <iCore/iCore.h>

And the framework should be copied to the Libs/Extra folder

 

[gglaz]

I've uploaded the library to the new builders.

If using a local builder then you need to modify the h file and change #import "iCore.h" to #import <iCore/iCore.h>

And the framework should be copied to the Libs/Extra folder

Thank you, it works with the Hosted Builder.
With the Local Builder, I get the error: "ld: library 'iTesseract' not found
clang: error: linker command failed with exit code 1 (use -v to see invocation)".

In itesseract.h, I adjusted the iCore import to <iCore/iCore.h>. I copy TesseractOCR.framework to the Libs/Extra folder. Is there a missing reference in the XML, or what have I done wrong?

Best regards

 

[Erel]

Are you sure that you copied the .h and .a files to the Libs folder?

 

[gglaz]

Are you sure that you copied the .h and .a files to the Libs folder?

Thank you very much, I actually forgot to include libiTesseract.a in the libs folder.