B4J Question [SOLVED] Tesseract API - a $120 opotunity

jroriz · Jan 14, 2019

Hi.

I have a budget of $ 120.00 for the first that can translate

this
http://tess4j.sourceforge.net/docs/docs-0.4/net/sourceforge/tess4j/Tesseract.html

into a B4J (for windows) function like
OCR(img as b4xbitmap) as string ' returns the text inside img

I know it can be done with JNA, but i dont have a clue...

It needs to read a byte array, not an image file on disk.

Daestrum · Jan 15, 2019

Try this it can read from an image file or a byte buffer.

jTesseract.bas is the source for the library.

pic1.png is what I used for testing it.

xulihang · Jan 15, 2019

As this is a desktop app, we can also simply run tesseract's commandline program. I made a pdf to text tool this way.

jroriz · Jan 15, 2019

Daestrum said:
Try this it can read from an image file or a byte buffer.

jTesseract.bas is the source for the library.

pic1.png is what I used for testing it.

Error when i try to compile:

B4J Version: 7.00
Java Version: 8
Parsing code. (0.21s)
Building folders structure. (0.02s)
Compiling code. (0.24s)
Compiling layouts code. (0.00s)
Organizing libraries. (0.00s)
Compiling generated Java code. Error
Cannot find: c:\temp\tess4j\commons-beanutils-1.9.2.jar

jroriz · Jan 15, 2019

xulihang said:
As this is a desktop app, we can also simply run tesseract's commandline program. I made a pdf to text tool this way.

But i have to read a byte array, exactly what @Daestrum did.
I think command line reads only image files.

Daestrum · Jan 15, 2019

Sorry these are the extra jar files tesseract requires ( I just placed them in c:/temp/tess4j to stop my extralibs getting too large.

B4X:

commons-beanutils-1.9.2.jar     
commons-collections-3.2.1.jar
commons-io-2.6.jar             
commons-logging-1.2.jar
fontbox-2.0.12.jar             
ghost4j-1.0.1.jar
itext-2.1.7.jar                 
jai-imageio-core-1.4.0.jar
jbig2-imageio-3.0.2.jar         
jboss-logging-3.1.4.GA.jar
jboss-vfs-3.2.14.Final.jar     
jcl-over-slf4j-1.7.25.jar
jna-5.1.0.jar                   
jul-to-slf4j-1.7.25.jar
lept4j-1.10.0.jar               
log4j-1.2.17.jar
log4j-over-slf4j-1.7.25.jar     
logback-classic-1.2.3.jar
logback-core-1.2.3.jar         
pdfbox-2.0.12.jar               
pdfbox-debugger-2.0.12.jar
pdfbox-tools-2.0.12.jar         
slf4j-api-1.7.25.jar
tess4j-4.3.1.jar               
xmlgraphics-commons-1.4.jar

jroriz · Jan 15, 2019

Daestrum said:

Sorry these are the extra jar files tesseract requires ( I just placed them in c:/temp/tess4j to stop my extralibs getting too large.

B4X:

commons-beanutils-1.9.2.jar    
commons-collections-3.2.1.jar
commons-io-2.6.jar            
commons-logging-1.2.jar
fontbox-2.0.12.jar            
ghost4j-1.0.1.jar
itext-2.1.7.jar                
jai-imageio-core-1.4.0.jar
jbig2-imageio-3.0.2.jar        
jboss-logging-3.1.4.GA.jar
jboss-vfs-3.2.14.Final.jar    
jcl-over-slf4j-1.7.25.jar
jna-5.1.0.jar                  
jul-to-slf4j-1.7.25.jar
lept4j-1.10.0.jar              
log4j-1.2.17.jar
log4j-over-slf4j-1.7.25.jar    
logback-classic-1.2.3.jar
logback-core-1.2.3.jar        
pdfbox-2.0.12.jar              
pdfbox-debugger-2.0.12.jar
pdfbox-tools-2.0.12.jar        
slf4j-api-1.7.25.jar
tess4j-4.3.1.jar              
xmlgraphics-commons-1.4.jar

Could you please attach them all?

Daestrum · Jan 15, 2019

Get them from here (then we don't use up Erels storage)
https://jar-download.com/artifact-search/tess4j

jroriz · Jan 15, 2019

Daestrum said:
Get them from here (then we don't use up Erels storage)
https://jar-download.com/artifact-search/tess4j

Now the error is gone.
But there is another one:

Code:

B4X:

    Dim t As jTesseract
    t.Initialize("C:\tess\tessdata")
    Dim c3po As AWTRobot
    Log(t.OcrFromBuffer(c3po.ScreenCaptureAsByteArray))

Raises the error:

jtesseract._ocrfrombuffer (java line: 72)
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at anywheresoftware.b4j.object.JavaObject.RunMethod(JavaObject.java:132)
at b4j.example.jtesseract._ocrfrombuffer(jtesseract.java:72)
at b4j.example.main$ResumableSub_Teste.resume(main.java:7700)
at b4j.example.main._teste(main.java:7672)
at b4j.example.main._mainform_mouseclicked(main.java:4286)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:91)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:78)
at anywheresoftware.b4j.objects.NodeWrapper$1.handle(NodeWrapper.java:93)
at anywheresoftware.b4j.objects.NodeWrapper$1.handle(NodeWrapper.java:1)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3470)
at javafx.scene.Scene$ClickGenerator.access$8100(Scene.java:3398)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3766)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:394)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$353(GlassViewEventHandler.java:432)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.UnsatisfiedLinkError: NÃ£o foi possÃvel encontrar o mÃ³dulo especificado.
at com.sun.jna.Native.open(Native Method)
at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:288)
at com.sun.jna.NativeLibrary.getInstance(NativeLibrary.java:427)
at com.sun.jna.Library$Handler.<init>(Library.java:179)
at com.sun.jna.Native.loadLibrary(Native.java:641)
at com.sun.jna.Native.loadLibrary(Native.java:625)
at net.sourceforge.tess4j.util.LoadLibs.getTessAPIInstance(LoadLibs.java:85)
at net.sourceforge.tess4j.TessAPI.<clinit>(TessAPI.java:42)
at net.sourceforge.tess4j.Tesseract.init(Tesseract.java:426)
at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:310)
at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:293)
at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:274)
at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:258)
at b4j.example.jtesseract.getImgTextFromBuffer(jtesseract.java:118)
... 47 more

Daestrum · Jan 15, 2019

Did you download the traineddata file for the language you want to use ?

In the tess4j folder there should be 25 jar files and one directory(tessdata)

jroriz · Jan 15, 2019

Daestrum said:
Did you download the traineddata file for the language you want to use ?

Thats what i have done so far:
- downloade tess4j, and extracted to c:\tess4j
- edited the jTesseract.xml, an changed c:\temp\tess4j for c:\tess4j, where i put the others jars.

Im using english for language.

Thats my C:\Tess4J\tessdata folder:

Daestrum · Jan 15, 2019

ok try this - it is using the jTesseract as a class module.

You will need to change the location of the jars in the main module.

jroriz · Jan 15, 2019

Daestrum said:
ok try this - it is using the jTesseract as a class module.

You will need to change the location of the jars in the main module.

Nope, same error.

Well, try downloading my project (your last project updated), and my tess4j folder: https://www.dropbox.com/sh/niwxbn1hjf813xr/AABXzShZ5_iAoJk4nPZOwXLMa?dl=0
(use the top right "download" option)

Daestrum · Jan 15, 2019

I loaded your b4j app - changed the path to the jars in the main module and it worked fine.

Daestrum · Jan 15, 2019

Note my tessdata folder only has eng.traineddata in it no other files at all.

jroriz · Jan 15, 2019

Daestrum said:
Note my tessdata folder only has eng.traineddata in it no other files at all.

Is there something special with file tess4j-3.4.8.jar wich is in the C:\Tess4J\dist folder. Shoud it be copied to any special place?
Did you "instaled" something? I simply downloaded and unziped the tess4j.

Daestrum · Jan 15, 2019

On the link I posted in post #8 I just downloaded the file (it was called jar_files.zip), unpacked it into my c:/temp/tess4j folder

jroriz · Jan 15, 2019

Daestrum said:
On the link I posted in post #8 I just downloaded the file (it was called jar_files.zip), unpacked it into my c:/temp/tess4j folder

I've done it all again and now it worked.
But it's issuing a warning, which I think slows down the OCR process.
"Warning: Parameter not found: enable_new_segsearch"

jroriz · Jan 15, 2019

Daestrum said:
On the link I posted in post #8 I just downloaded the file (it was called jar_files.zip), unpacked it into my c:/temp/tess4j folder

Fixed!
Works with this eng.traineddata: https://github.com/tesseract-ocr/tessdata_fast/blob/master/eng.traineddata

Now I think I owe you $120,00... How can I pay you?

Daestrum · Jan 15, 2019

You really don't owe me anything.
I enjoy writing code not for monetary reward.
What you could do with it
A, buy a book on java this will help you.
B, have a meal with it.
C, use it to extend your b4x licence.
D, keep it.

The plus for me is I had never heard of Tesseract before today, so I learned something new too.

B4J Question [SOLVED] Tesseract API - a $120 opotunity

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