線画抽出サンプルコード

line_drawing.cpp

#include <opencv2/core.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/highgui.hpp>
#include <iostream>

int main(int argc, const char* argv[])
{
    if (argc < 2)
    {
        std::cout << "Usage: ./line_drawing <filename>" << std::endl;
        return -1;
    }

    cv::Mat src = cv::imread(argv[1], cv::IMREAD_GRAYSCALE);
    if (src.empty())
    {
        std::cout << "Error: Could not load image file." << std::endl;
        return -1;
    }

    cv::Mat temp, dst;
    cv::dilate(src, temp, cv::Mat(), cv::Point(-1, -1), 1);
    cv::absdiff(src, temp, dst);
    cv::bitwise_not(dst, dst);

    cv::imshow("line drawing", dst);
    cv::waitKey(0);
    cv::destroyAllWindows();

    return 0;
}