kepfeldolgozas/ora5/proj4/main.cpp

#include "histo.h"
#include "opencv2/imgcodecs.hpp"
#include "opencv2/videoio.hpp"
#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include <iostream>

using namespace cv;

int calc_th(Mat img, float fg_ratio = 0.1f){
    int nfg = img.cols * img.rows * fg_ratio;
    Mat histo;
    Histo::calcHistoC1(img, histo);
    
    double s = 0;
    int th = 0;
        
    for(; th < 256; th++){
        s += histo.at<int>(th);
        if(s >= nfg){
            return th;
        }
    }

    return -1;
}


int main(){
    Mat img = imread("../scanned3.png", IMREAD_GRAYSCALE);
    int th = calc_th(img, 0.1f);
    imshow("t", img);
    Mat mask;
    if(th != -1){
        threshold(img, mask, th, 255, THRESH_BINARY);
        imshow("img2", mask);
    }

    while(waitKey(3) != 'q');
    return 0;
}