tessapi | Tesseract source code and API documentation | Computer Vision library
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QUESTION
I am using .net core c# code to extract text from image using Tesseract. I have added Tesseract 3.3.0 to my project using NuGet package command. This code is working fine on my windows machine. However this fails on Linux machine. After research on internet, I got to know that I need to link liblept and libtesseract files. Hence I am doing below to link the files.
...ANSWER
Answered 2020-Nov-09 at 11:40First error you did is pretending that tesseract library 4.x version is tesseract 3.x (by creating symbolic link). This will never work. 3.x library is outdated not support, so best thing you can do is upgrade your app to 4.x/5.x tesseract.
QUESTION
I just downloaded Tess4J from http://tess4j.sourceforge.net/ and imported it in netbeans. I am follwoing this url i followed every step properly but when i am trying to execute i am getting below error.
Error:
...ANSWER
Answered 2018-Feb-24 at 15:42Seems it is not loading the native Dlls.
The Tesseract DLLs were built with VS2015 and therefore depend on the Visual C++ 2015 Redistributable Packages. Install it.
Tesseract, Ghostscript, and Leptonica Windows 32- and 64-bit DLLs are embedded in tess4j.jar and lept4j.jar, respectively. So make sure you have them on the class path.
Make sure you have all the dependency libraries on the class path (The Libraries can be found in Your_downloaded_Tess4J_folder\lib )
Make sure you have "tessdata" folder on the class path (The "tessdata" folder can be found in Your_downloaded_Tess4J_folder).
Please read the Tess4J Tutorial for better understanding.
QUESTION
I m using Tess4J under maven, I already used the pom dependency everything is well downloaded in the .m2 repository, I also downloaded the tess4j jna wrapper from source forge. But what ever I do I m still getting this exception :
...ANSWER
Answered 2017-Apr-29 at 20:06This Solution is working for me, tesseract or tess4j is dependable to vs2015 not vs2013 as I did found in some threads. all I did was installing Visual C++ 2015 Redistributable Packages. and it works fine
Thanks for help
QUESTION
when i am trying to execute tess4j in eclipse in my windows 7 machine, i am getting the below error.
java.lang.UnsatisfiedLinkError: The specified module could not be found.
...ANSWER
Answered 2017-Nov-29 at 12:23I am also having the same specification as you.
Eclipse : 64bit
JDK 1.8 :64bit
OS :64bit
jar Tess4j :3.4.2 version
Check in your installed programs (Control Panel->Programs->Programs and Features) for
microsoft visual c++ 2015 redistributable x64 is avalable or not.
If not then download it from here and install it.
Then try your app running again. It worked for me
QUESTION
I am trying to implement OCR using tess4j.When I am running the application in eclipse its working fine.But when I deployed the WAR file to tomcat or Jboss I am getting below error
...HTTP Status 500 - Handler processing failed; nested exception is java.lang.UnsatisfiedLinkError: The specified module could not be found.
type Exception report
message Handler processing failed; nested exception is java.lang.UnsatisfiedLinkError: The specified module could not be found.
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.springframework.web.util.NestedServletException: Handler processing failed; nested exception is java.lang.UnsatisfiedLinkError: The specified module could not be found.
org.springframework.web.servlet.DispatcherServlet.triggerAfterCompletionWithError(DispatcherServlet.java:1303) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:977) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) javax.servlet.http.HttpServlet.service(HttpServlet.java:622) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) root cause
java.lang.UnsatisfiedLinkError: The specified module could not be found.
com.sun.jna.Native.open(Native Method) com.sun.jna.Native.open(Native.java:1759) com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:260) com.sun.jna.NativeLibrary.getInstance(NativeLibrary.java:398) com.sun.jna.Library$Handler.(Library.java:147) com.sun.jna.Native.loadLibrary(Native.java:412) com.sun.jna.Native.loadLibrary(Native.java:391) net.sourceforge.tess4j.util.LoadLibs.getTessAPIInstance(LoadLibs.java:75) net.sourceforge.tess4j.TessAPI.(TessAPI.java:42) net.sourceforge.tess4j.Tesseract.init(Tesseract.java:367) net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:280) net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:212) net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:196) org.infotech.jdol.pdfjs.Utils.doOCRSample(Utils.java:77) org.infotech.jdol.pdfjs.Utils.imageAsPDF(Utils.java:54) org.infotech.jdol.pdfjs.controllers.PdfViewerController.getViewer(PdfViewerController.java:25) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:498) org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137) org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:111)
ANSWER
Answered 2017-Nov-29 at 11:41I have implemented only for apache that i am posting here
create a folder structure like the below in your apache tomcat. apache-tomcat-8.0.39\temp\tess4j\win32-x86-64
paste the below dlls in your win32-x86-64 folder
- gsdll64.dll
- liblept174.dll
- libtesseract305.dll
Note: eclipse and java i used are 64 bit
below is the screenshot about the path of dlls that added
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