opencv 二值化图像 像素统计 countNonZero

对二值化图像执行countNonZero。可得到非零像素点数.

IplImage* srcImg = cvLoadImage("Lena.jpg");//注意：当将参数copyData设为true后，则为深拷贝（复制整个图像数据）Mat M(srcImg, true);#include <opencv2/core/core.hpp>#include <opencv2/highgui/highgui.hpp>#include <opencv2/imgproc/imgproc.hpp>#include <string>using namespace cv;void main(){cv::Mat image = imread("threshold.jpg");cv::namedWindow("original");cv::imshow("original",image);string windowstring = "result 0";string imagestring = "result 0.jpg";cv::Mat result;enum thresholdtype{THRESH_BINARY ,THRESH_BINARY_INV,THRESH_TRUNC,THRESH_TOZERO,THRESH_TOZERO_INV};for (int thresh = 0;thresh<5;thresh++){ /* 0: 二进制阈值    1: 反二进制阈值    2: 截断阈值    3: 0阈值    4: 反0阈值  */threshold(image,result,150,255,thresholdtype(thresh));//改变参数实现不同的threshold// 得到非0的像素值int iVal255 = countNonZero(result);cv::namedWindow(windowstring);cv::imshow(windowstring,result);//显示输出结果cv::imwrite(imagestring,result);windowstring[7]++;imagestring[7]++;}waitKey(0);}

程序结果：

threshold.jpg（源图像）

THRESH_BINARY（二进制阈值）

 

THRESH_BINARY_INV（反二进制阈值）

 THRESH_TRUNC（截断阈值）

  

 THRESH_TOZERO（0阈值）

 

THRESH_TOZERO_INV（反0阈值）