TRecognizer.cpp

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/*********************************************************************
        The MIT License (MIT)

        Copyright (c) <2013> <Vojtech Novak>

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#include "text_locator/TRecognizer.hpp"
#include <opencv/highgui.h>
#include <sstream>
#include <cstdlib>
#include <text_locator/utils.hpp>

namespace ros_text_locator {

TRecognizer::TRecognizer(tesseract::PageSegMode pageSegMode, std::string lang =
                "eng") :
                mode(pageSegMode), lang(lang), api(new tesseract::TessBaseAPI()) {
}

bool TRecognizer::initTesseract() {
        if (api->Init("/usr/share/tesseract-ocr/", lang.c_str())) {
                fprintf(stderr, "Could not initialize tesseract.\n");
                std::exit(EXIT_FAILURE);
                return false;
        }
        return true;
}

TRecognizer::~TRecognizer() {
        api->Clear();
        api->End();
}

std::string TRecognizer::recognize(const cv::Mat &img, int x, int y, int width, int height) {
        initTesseract();
        std::string out = tesseract(img, x, y, width, height);
        return trim(out);
}

void TRecognizer::recognize(const cv::Mat &img, std::vector<Text2D>& text2d) {
        std::string in;
        initTesseract();
        for (size_t i = 0; i < text2d.size(); i++) {
                Text2D& r = text2d.at(i);
                in = tesseract(img, r.x, r.y, (r.x2 - r.x), (r.y2 - r.y));
                r.text = trim(in);
        }
}

const char* TRecognizer::tesseract(const cv::Mat &image, int left, int top,
                int width, int height) {
        api->SetImage(image.data, image.cols, image.rows, image.channels(),
                        image.step1());
        api->SetPageSegMode(mode);
        api->SetRectangle(left, top, width, height);
        char* outText = api->GetUTF8Text();
        //std::cout << (outText) << std::endl;
        return outText;
}

} /* namespace manipulator */