opencv Mat 数据 最大值和最小值
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由于之前写的一些程序好多都是基于opencv中的Mat类型的,现在,需要对其中的数据求取最大值和最小值。感觉opencv应该有STL中类似的sort函数...后来,google了一下,发现还真的确实有的。
//! finds global minimum and maximum array elements and returns their values and their locations
CV_EXPORTS_W void minMaxLoc(InputArray src, CV_OUT double* minVal,
CV_OUT double* maxVal=0, CV_OUT Point* minLoc=0,
CV_OUT Point* maxLoc=0, InputArray mask=noArray());
CV_EXPORTS void minMaxIdx(InputArray src, double* minVal, double* maxVal,
int* minIdx=0, int* maxIdx=0, InputArray mask=noArray());
实现代码如下所示:
#include <iostream>
#include <cstdlib>
#include <cmath>
#include <iomanip>
#include <algorithm>
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/contrib/contrib.hpp"
using namespace std;
using namespace cv;
int main(int argc, char* argv[])
{
#pragma region min_max
float Tval = 0.0;
float RawData[2][3] = {{4.0,1.0,3.0},{8.0,7.0,9.0}};
Mat RawDataMat(2,3,CV_32FC1,RawData);
for (int j = 0; j < 2; j++)
{
for (int i = 0; i < 3; i++)
{
//Tval = RawData[j][i]; //No problem !!!
Tval = RawDataMat.at<float>(j,i);
cout << "(j,i) = "<<j<<","<<i<<"\t"<<Tval<<endl;
}
}
double minv = 0.0, maxv = 0.0;
double* minp = &minv;
double* maxp = &maxv;
minMaxIdx(RawDataMat,minp,maxp);
cout << "Mat minv = " << minv << endl;
cout << "Mat maxv = " << maxv << endl;
#pragma endregion
return 0;
}
附图: