Compile: g++ -O3 -std=c++11 ocr_simple.cpp `pkg-config --cflags --libs tesseract opencv`

ocr_simple.cpp

#include <string>
#include <tesseract/baseapi.h>
#include <leptonica/allheaders.h>
#include <opencv2/opencv.hpp>

using namespace std;
using namespace cv;

int main(int argc, char* argv[]){
        string outText;
        string imPath = argv[1];
        // Create Tesseract object
        tesseract::TessBaseAPI *ocr = new tesseract::TessBaseAPI();
        // Initialize tesseract to use English (eng) and the LSTM OCR engine. 
        ocr->Init(NULL, "eng", tesseract::OEM_LSTM_ONLY);
        // Set Page segmentation mode to PSM_AUTO (3)
        ocr->SetPageSegMode(tesseract::PSM_AUTO);
        // Open input image using OpenCV
        Mat im = cv::imread(imPath, IMREAD_COLOR);
        // Set image data
        ocr->SetImage(im.data, im.cols, im.rows, 3, im.step);
        // Run Tesseract OCR on image
        outText = string(ocr->GetUTF8Text());
        // print recognized text
        cout << outText << endl; // Destroy used object and release memory ocr->End();
        return EXIT_SUCCESS;
}