DebugHelpers.hpp

/*****************************************************************************
*   Markerless AR desktop application.
******************************************************************************
*   by Khvedchenia Ievgen, 5th Dec 2012
*   http://computer-vision-talks.com
******************************************************************************
*   Ch3 of the book "Mastering OpenCV with Practical Computer Vision Projects"
*   Copyright Packt Publishing 2012.
*   http://www.packtpub.com/cool-projects-with-opencv/book
*****************************************************************************/

#ifndef DEBUG_HELPERS_HPP
#define DEBUG_HELPERS_HPP

#include <string>
#include <sstream>

// Does lexical cast of the input argument to string
template <typename T>
std::string ToString(const T& value)
{
    std::ostringstream stream;
    stream << value;
    return stream.str();
}

namespace cv
{
    // This function used to show and save the image to the disk (used for during chapter writing).
    inline void showAndSave(std::string name, const cv::Mat& m)
    {
        cv::imshow(name, m);
        cv::imwrite(name + ".png", m);
        //cv::waitKey(25);
    }

    // Draw matches between two images
    inline cv::Mat getMatchesImage(cv::Mat query, cv::Mat pattern, const std::vector<cv::KeyPoint>& queryKp, const std::vector<cv::KeyPoint>& trainKp, std::vector<cv::DMatch> matches, int maxMatchesDrawn)
    {
        cv::Mat outImg;

        if (matches.size() > maxMatchesDrawn)
        {
            matches.resize(maxMatchesDrawn);
        }

        cv::drawMatches
            (
            query, 
            queryKp, 
            pattern, 
            trainKp,
            matches, 
            outImg, 
            cv::Scalar(0,200,0,255), 
            cv::Scalar::all(-1),
            std::vector<char>(), 
            cv::DrawMatchesFlags::NOT_DRAW_SINGLE_POINTS
            );

        return outImg;
    }
}

#endif