Ubuntu 上的 Tess4J 崩溃 JVM

Question

我是 Tess4J 和 JNA 的新手，如果这很明显，我深表歉意，但我无法在博客中找到。 我在 Ubuntu 18.04 上，运行 Java 17.0.1、Tomcat 10.0。我已经构建了一个简单的动态网络应用程序，详细信息如下。我安装了这样的资源：

sudo apt install tesseract-ocr tesseract-ocr-rus libleptonica-dev

首先我要提到的是，我能够从命令行毫无问题地处理我的测试文档：

tesseract /tmp/output-0.jpg /tmp/file -l rus+eng

但是当我在 Java 中尝试相同的操作时，JVM 崩溃了。

我的类OCR里面的相关Java如下：

    private static final String tessDir = "/usr/share/tesseract-ocr/4.00/";
    private static final String libDir = "/usr/lib/x86_64-linux-gnu";
    private ITesseract ocr = new Tesseract();
    
    public OCR() {
        System.setProperty("java.library.path", System.getProperty("java.library.path") + ":" + libDir);
        ocr.setDatapath(tessDir);
    }

    public String doOcr (String inputDirName, String outputDirName, List<File> files, Set<Lang> langs) throws IOException {
        File f1 = new File("/tmp/output-0.jpg");
        String s = "";
        ocr.setLanguage("rus+eng");
        try {
            s = ocr.doOCR(f1);
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage());
        }
        return s;
    }

pom.xml：

    <dependency>
        <groupId>net.java.dev.jna</groupId>
        <artifactId>jna-platform</artifactId>
        <version>5.6.0</version>
    </dependency>
    <dependency>
        <groupId>com.github.jai-imageio</groupId>
        <artifactId>jai-imageio-core</artifactId>
        <version>1.3.0</version>
    </dependency>
    <dependency>
        <groupId>net.sourceforge.tess4j</groupId>
        <artifactId>tess4j</artifactId>
        <version>4.6.0</version>
    </dependency>
    <dependency>
        <groupId>net.sourceforge.lept4j</groupId>
        <artifactId>lept4j</artifactId>
        <version>1.16.1</version>
    </dependency>
    <dependency>
        <groupId>org.ghost4j</groupId>
        <artifactId>ghost4j</artifactId>
        <version>1.0.1</version>
    </dependency>

崩溃日志如下所示：

# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007f67aeed2c27, pid=23274, tid=23912
#
# JRE version: Java(TM) SE Runtime Environment (17.0.1+12) (build 17.0.1+12-LTS-39)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (17.0.1+12-LTS-39, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, parallel gc, linux-amd64)
...
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C  [libtesseract.so.4+0xa1c27]  tesseract::Tesseract::recog_all_words(PAGE_RES*, ETEXT_DESC*, TBOX const*, char const*, int)+0x437

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j  com.sun.jna.Native.invokePointer(Lcom/sun/jna/Function;JI[Ljava/lang/Object;)J+0
j  com.sun.jna.Function.invokePointer(I[Ljava/lang/Object;)Lcom/sun/jna/Pointer;+7
j  com.sun.jna.Function.invoke([Ljava/lang/Object;Ljava/lang/Class;ZI)Ljava/lang/Object;+385
j  com.sun.jna.Function.invoke(Ljava/lang/reflect/Method;[Ljava/lang/Class;Ljava/lang/Class;[Ljava/lang/Object;Ljava/util/Map;)Ljava/lang/Object;+271
j  com.sun.jna.Library$Handler.invoke(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;+390
j  jdk.proxy3.$Proxy10.TessBaseAPIGetUTF8Text(Lnet/sourceforge/tess4j/ITessAPI$TessBaseAPI;)Lcom/sun/jna/Pointer;+16 jdk.proxy3
j  net.sourceforge.tess4j.Tesseract.getOCRText(Ljava/lang/String;I)Ljava/lang/String;+269
j  net.sourceforge.tess4j.Tesseract.doOCR(Ljavax/imageio/IIOImage;Ljava/lang/String;Ljava/awt/Rectangle;I)Ljava/lang/String;+18
j  net.sourceforge.tess4j.Tesseract.doOCR(Ljava/io/File;Ljava/awt/Rectangle;)Ljava/lang/String;+126
j  net.sourceforge.tess4j.Tesseract.doOCR(Ljava/io/File;)Ljava/lang/String;+3
j  mypackage.OCR.doOcr(Ljava/lang/String;Ljava/lang/String;Ljava/util/List;Ljava/util/Set;)Ljava/lang/String;+32

在 libDir 中确实有 libtesseract.so.4 -> libtesseract.so.4.0.0 和 liblept.so -> liblept.so.5.0.2。

那么我错过了什么？某处版本不匹配？

Answer 1

不太确定您是否知道，但似乎有一个可用的 API，您可以简单地使用而不是直接指向您的安装库文件夹。

这意味着这将与平台无关，并且无论在 windows/linux 上都可以工作。

使用示例：

pom.xml 构建文件

<project>
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.bytedeco.tesseract</groupId>
    <artifactId>BasicExample</artifactId>
    <version>1.5.7-SNAPSHOT</version>
    <properties>
        <exec.mainClass>BasicExample</exec.mainClass>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>tesseract-platform</artifactId>
            <version>5.0.0-1.5.7-SNAPSHOT</version>
        </dependency>
    </dependencies>
    <build>
        <sourceDirectory>.</sourceDirectory>
    </build>
</project>

BasicExample.java 源文件

import org.bytedeco.javacpp.*;
import org.bytedeco.leptonica.*;
import org.bytedeco.tesseract.*;
import static org.bytedeco.leptonica.global.lept.*;
import static org.bytedeco.tesseract.global.tesseract.*;

public class BasicExample {
    public static void main(String[] args) {
        BytePointer outText;

        TessBaseAPI api = new TessBaseAPI();
        // Initialize tesseract-ocr with English, without specifying tessdata path
        if (api.Init(null, "eng") != 0) {
            System.err.println("Could not initialize tesseract.");
            System.exit(1);
        }

        // Open input image with leptonica library
        PIX image = pixRead(args.length > 0 ? args[0] : "/usr/src/tesseract/testing/phototest.tif");
        api.SetImage(image);
        // Get OCR result
        outText = api.GetUTF8Text();
        System.out.println("OCR output:\n" + outText.getString());

        // Destroy used object and release memory
        api.End();
        outText.deallocate();
        pixDestroy(image);
    }
}

项目文档：

https://github.com/bytedeco/javacpp-presets/tree/master/tesseract

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