opencv 自适应二值化

//图片读入时注意图片格式，如果格式不符合转化为符合格式再运行
#include <iostream>  
#include <opencv2/opencv.hpp>  
using namespace cv;

int main(int argc, char** argv)
{
    cv::Mat image = cv::imread("../test.bmp", CV_LOAD_IMAGE_GRAYSCALE);
    imshow("testSrc", image);

    if (image.empty())
    {
        std::cout << "read image failure" << std::endl;
        return -1;
    }

    // 全局二值化  
    int th = 100;
    cv::Mat global;
    cv::threshold(image, global, 70, 255, CV_THRESH_BINARY_INV);


    // 局部二值化  

    int blockSize = 25;
    int constValue = 10;
    cv::Mat local;
    cv::adaptiveThreshold(image, local, 255, CV_ADAPTIVE_THRESH_MEAN_C, CV_THRESH_BINARY_INV, blockSize, constValue);


    cv::imwrite("global.jpg", global);
    cv::imwrite("local.jpg", local);

    cv::imshow("globalThreshold", global);
    cv::imshow("localThreshold", local);
    cv::waitKey(0);


    return 0;
}

原图：

全局二值化效果图

自适应二值化