java - Tess4j 不使用它的 tessdata 文件夹

Question

我正在使用 tess4j，Tesseract 的 java 包装器。我也安装了普通的 Tesseract。我不确定 tess4j 是如何工作的，但由于它带有一个 tessdata 文件夹，我可以假设您会将语言数据文件放在那里。但是，tess4j 仅在语言数据文件位于“真实”tessdata 文件夹(tesseract 附带的文件夹，而不是 tess4j)中时才有效。如果我删除该文件夹，我会收到此错误消息:

Error opening data file C:\Program Files\Tesseract-OCR\tessdata/jpn.trained
data
Please make sure the TESSDATA_PREFIX environment variable is set to the par
ent directory of your "tessdata" directory.
Failed loading language 'jpn'
Tesseract couldn't load any languages!
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x631259dc, pid=5108, tid=
10148
#
# JRE version: 7.0_06-b24
# Java VM: Java HotSpot(TM) Client VM (23.2-b09 mixed mode, sharing windows
-x86 )
# Problematic frame:
# C  [libtesseract302.dll+0x59dc]  STRING::strdup+0x467c
#
# Failed to write core dump. Minidumps are not enabled by default on client
 versions of Windows
#
# An error report file with more information is saved as:
# D:\School\Programs\OCRTest\v1.0.0\hs_err_pid5108.log
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.sun.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#

这是否意味着我需要安装 Tesseract 才能使用 tess4j？为什么？或者也许我的 tess4j tessdata 文件夹在错误的位置(它当前与我的 .java 文件一起，tess4j jar 在我设置了类路径的 lib 文件夹中)。

Answer 1

对于那些使用 maven 但不喜欢使用全局变量的人，这对我有用:

File imageFile = new File("C:\\random.png");
Tesseract instance = Tesseract.getInstance();

//In case you don't have your own tessdata, let it also be extracted for you
File tessDataFolder = LoadLibs.extractTessResources("tessdata");

//Set the tessdata path
instance.setDatapath(tessDataFolder.getAbsolutePath());

try {
    String result = instance.doOCR(imageFile);
    System.out.println(result);
} catch (TesseractException e) {
    System.err.println(e.getMessage());
}

找到 here , 测试maven -> net.sourceforge.tess4j:tess4j:3.4.1，链接也使用1.4.1 jar