tess4j with Spring mvc - spring

Question

I have tried tess4j as a standalone java program and it worked properly giving the text output.
Now i am trying to create a spring mvc web project adding the dependencies for tess4j in pom and i have added the tess4j source inside my project.
File imageFile = new File("D:/Data/jars/tess/eurotext.tif");
Tesseract instance = Tesseract.getInstance(); // JNA Interface Mapping
// Tesseract1 instance = new Tesseract1(); // JNA Direct Mapping
try {
result = instance.doOCR(imageFile);
System.out.println(result);
} catch (TesseractException e) {
System.err.println(e.getMessage());
}
The above code works properly when i tried to run a standalone java program inside the project.so its clear that the jar files are added to build path properly.
but when i call the code in a controller mapping or service it throws a run time exception.
SEVERE: Unsupported image format. May need to install JAI Image I/O package.
https://java.net/projects/jai-imageio/
java.lang.RuntimeException: Unsupported image format. May need to install JAI Image I/O package.
https://java.net/projects/jai-imageio/
at net.sourceforge.vietocr.ImageIOHelper.getIIOImageList(ImageIOHelper.java:324)
at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:173)
at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:158)
at com.ocr.tesseract.TesseractExample.getTextFromImage(TesseractExample.java:27)
at com.cogz.tp.controller.HomeController.view(HomeController.java:51)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:748)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:822)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:409)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1044)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:662)
java.lang.RuntimeException: Unsupported image format. May need to install JAI Image I/O package.
https://java.net/projects/jai-imageio/
Please let me know what am missing.Thanks in advance.

Answer 1

Even I faced the similar problem of using tess4j for DynamicWebProject. But thanks to comment by #nguyenq that helped me I got it working.
Mostly tess4j uses TIFF handler for optical recognition. The dependencies required for it are not available with default ImageIO.
So, jai-imageio.jar is required. All I did was added line ImageIO.scanForPlugins() before I called the wrapper class that performed doOCR.
I had following jars in my lib:-
tess4j.jar
jai_imageio.jar
ghost4j-0.3.1.jar
jna.jar
junit-4.10.jar
Here's the sample code:
TessractOCR tessocr = new TessractOCR();
ImageIO.scanForPlugins();
String extractedString = tessocr.extractTextFromImage(binarizrImage);
The function
public static String extractTextFromImage(BufferedImage image){
RenderedImage img = image;
String result =null;
try {
File outputfile = new File("saved.png");
ImageIO.write(img, "png", outputfile);
Tesseract instance = Tesseract.getInstance(); // JNA Interface Mapping
instance.setDatapath("E:\\OCR-data\\Tess4J-1.2-src\\Tess4J");
result = instance.doOCR(outputfile);
System.out.println(result);
} catch (Exception e) {
System.err.println(e.getMessage());
}
return result;
}
It works 100% :)

Answer 2

Below is the working code sharing for all:
public static String doOCR(File pdfInvoice) {
String result = "";
long totalTime = 0;
long endTime = 0;
long startTime = System.currentTimeMillis();
File imageFile = new File("D:\\docfolder\\9011121584.pdf");
Tesseract instance = Tesseract.getInstance(); //
try {
ImageIO.scanForPlugins();
result = instance.doOCR(imageFile);
endTime = System.currentTimeMillis();
totalTime = endTime - startTime;
System.out.println("Total Time Taken For OCR: " + (totalTime / 1000));
return result;
} catch (Exception e) {
System.err.println(e.getMessage());
result = "";
return result;
}
}