我已经尝试将 tess4j 作为独立的 java 程序,并且它可以正常工作并给出文本输出。
现在我正在尝试创建一个 spring mvc web 项目,在 pom 中添加 tess4j 的依赖项,并且我已在我的项目中添加了 tess4j 源。
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());
}
当我尝试在项目内运行独立的 java 程序时,上面的代码可以正常工作。因此很明显,jar 文件已正确添加到构建路径。
但是当我调用控制器映射或服务中的代码时,它会引发运行时异常。
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/
请让我知道缺少什么。提前致谢。
即使我也遇到了类似的使用问题tess4j
for DynamicWebProject
。但感谢 @nguyenq 的评论帮助我,我让它工作了。
tess4j 大多数情况下使用 TIFF 处理程序进行光学识别。默认 ImageIO 不提供所需的依赖项。
因此,需要 jai-imageio.jar。我所做的只是添加了一行ImageIO.scanForPlugins()
在我调用执行的包装类之前doOCR
。
我的库中有以下罐子:-
tess4j.jar
jai_imageio.jar
Ghost4j-0.3.1.jar
jna.jar
junit-4.10.jar
这是示例代码:
TessractOCR tessocr = new TessractOCR();
ImageIO.scanForPlugins();
String extractedString = tessocr.extractTextFromImage(binarizrImage);
功能
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;
}
100%有效:)
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