opencv提取水平和垂直线

main.cpp

#include <istream>
#include <opencv2/opencv.hpp>

using namespace cv;
using namespace std;


int main(int argc, char **argv) {
    Mat src, gray_dst, bin_dst, h_dst, v_dst, dst;
    //    加载图片
    src = imread("../../picture/chars.png", 1);
    if (!src.data) {
        printf("No image data \n");
        return -1;
    }
    char src_title[] = "src";
    namedWindow(src_title, WINDOW_AUTOSIZE);
    imshow(src_title, src);
    // 转换成灰度图像
    char gray_title[] = "gray";
    namedWindow(gray_title, WINDOW_AUTOSIZE);
    cvtColor(src, gray_dst, COLOR_BGR2GRAY);
    imshow(gray_title, gray_dst);
    //转换成二值图像
    char bin_title[] = "bin";
    namedWindow(bin_title, WINDOW_AUTOSIZE);
    adaptiveThreshold(~gray_dst, bin_dst, 255, ADAPTIVE_THRESH_MEAN_C, THRESH_BINARY, 15, -2);
    imshow(bin_title, bin_dst);
    // 提取水平直线
    char h_title[] = "h";
    Mat h = getStructuringElement(MORPH_RECT, Size(src.cols / 16, 1), Point(-1, -1));
    Mat tmp1;
    erode(bin_dst, tmp1, h);
    dilate(tmp1, h_dst, h);
    // 提取水平直线等价api
    // morphologyEx(bin_dst, h_dst, MORPH_OPEN, h);
    namedWindow(h_title, WINDOW_AUTOSIZE);
    imshow(h_title, h_dst);
    // 提取垂直直线
    char v_title[] = "v";
    Mat v = getStructuringElement(MORPH_RECT, Size(1, src.rows / 16), Point(-1, -1));
    Mat tmp2;
    erode(bin_dst, tmp2, v);
    dilate(tmp2, v_dst, v);
    // 提取垂直直线等价api
    // morphologyEx(bin_dst, v_dst, MORPH_OPEN, v);
    namedWindow(v_title, WINDOW_AUTOSIZE);
    imshow(v_title, v_dst);
    //  字符提取
    char dst_title[] = "dst";
    Mat kernel = getStructuringElement(MORPH_RECT, Size(3, 3), Point(-1, -1));
    // Mat tmp3;
    // erode(bin_dst, tmp3, kernel);
    // dilate(tmp3, dst, kernel);
    morphologyEx(bin_dst, dst, MORPH_OPEN, kernel);
    bitwise_not(dst, dst);
    blur(dst, dst, Size(3, 3), Point(-1, -1));
    namedWindow(dst_title, WINDOW_AUTOSIZE);
    imshow(dst_title, dst);
    //    等待按键
    waitKey(0);
    return 0;
}