#include <tesseract/baseapi.h>
#include <leptonica/allheaders.h>
#include <opencv2/opencv.hpp>
#include <sstream>
#include <memory>
#include <iostream>
#define path "/home/jovan/Pictures/"
void resize(cv::Mat &img);
PIX *mat8ToPix(const cv::Mat *mat8);
cv::Mat pix8ToMat(PIX *pix8);
int main(int argc, char **argv)
    // Load image
    std::stringstream ss;
    ss << path;
    ss << argv[1];
    cv::Mat im = cv::imread(ss.str() );
    if (im.empty())
        std::cout<<"Cannot open source image!" << std::endl;
        return EXIT_FAILURE;
    resize(im);
    cv::Mat gray;
    cv::cvtColor(im, gray, CV_BGR2GRAY);
    // Pass it to Tesseract API
    tesseract::TessBaseAPI tess;
    tess.Init(NULL, "eng", tesseract::OEM_DEFAULT);
    tess.SetPageSegMode(tesseract::PSM_SINGLE_BLOCK);
    tess.SetVariable("tessedit_char_whitelist", "QWERTYUIOPASDFGHJKLZXCVBNM");
    PIX *image = mat8ToPix(&im);
    //tess.SetImage((uchar*)gray.data, gray.cols, gray.rows, 1, gray.cols);
    tess.SetImage(image);
    // Get the text
    char* out = tess.GetUTF8Text();
    if(out != nullptr)
        std::cout << "here it is: "<< out << std::endl;
    cv::imshow("image", im);
    cv::imshow("gray", gray);
    cv::waitKey();
    return 0;
void resize(cv::Mat &img)
    while(img.size().width >= 500 && img.size().height >= 500 )
        cv::resize(img, img, cv::Size(img.size().width/2, img.size().height/2) );   
PIX *mat8ToPix(const cv::Mat *mat8)
    PIX *pixd = pixCreate(mat8->size().width, mat8->size().height, 8);
    for(int y=0; y<mat8->rows; y++) 
        for(int x=0; x<mat8->cols; x++) 
            pixSetPixel(pixd, x, y, (l_uint32) mat8->at<uchar>(y,x));
    return pixd;
cv::Mat pix8ToMat(PIX *pix8)
    cv::Mat mat(cv::Size(pix8->w, pix8->h), CV_8UC1);
    uint32_t *line = pix8->data;
    for (uint32_t y = 0; y < pix8->h; ++y)