Ubuntu tesseract

安装tesseract:

sudo apt install tesseract-ocr
sudo apt install libtesseract-dev

安装模型

sudo apt-get install tesseract-ocr-chi-sim

命令行调用

tesseract test.jpeg ./test -l chi-sim

C语言API

#include <stdio.h>

#include <tesseract/baseapi.h>
#include <leptonica/allheaders.h>

int main() {
    char *outText;

    tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();
    // Initialize tesseract-ocr with English, without specifying tessdata path
    if (api->Init(NULL, "eng+chi_sim")) {
        fprintf(stderr, "Could not initialize tesseract.
");
        exit(1);
    }

    // Open input image with leptonica library
    Pix *image = pixRead("./invoice_dialog.png");
    api->SetImage(image);
    // Get OCR result
    outText = api->GetUTF8Text();
    printf("OCR output:
%s", outText);

    // Destroy used object and release memory
    api->End();
    delete [] outText;
    pixDestroy(&image);

    return 0;
}

编译 

g++ -o myprogram myprogram.cpp -llept -ltesseract

出错

/usr/bin/ld: /tmp/ccIl3vUD.o: undefined reference to symbol '__gxx_personality_v0@@CXXABI_1.3'
//usr/lib/x86_64-linux-gnu/libstdc++.so.6: 无法添加符号: DSO missing from command line
collect2: error: ld returned 1 exit status
The terminal process terminated with exit code: 1

加入选项

g++ -o myprogram myprogram.cpp -llept -ltesseract -L/usr/lib/x86_64-linux-gnu -lstdc++

 出错

fatal error: leptonica/allheaders.h: No such file or directory

sudo apt install libleptonica-dev