opencv2反投影直方图以检測特定的图像内容
2024-09-04 12:35:19
#ifndef HISTOGRAM_H_
#define HISTOGRAM_H_
#include<opencv2/core/core.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/imgproc/imgproc.hpp>
#include <opencv2/calib3d/calib3d.hpp>
#include<iostream>
#include <vector> using namespace std;
using namespace cv; class Histogram1D
{
private:
int histSize[1];
float hranges[2];
const float *ranges[1];
int channels[1];
public:
Histogram1D();
cv::MatND getHistogram(const cv::Mat &image);
cv::Mat getHistogramImage(const cv::Mat &image);
cv::Mat applyLookUp(const cv::Mat &image,const cv::Mat &lookup);
cv::Mat stretch(const cv::Mat &image,int minValue=0);
cv::Mat equalize(const cv::Mat &image);
cv::Mat calcBack(const cv::Mat &image,const cv::MatND hist);
cv::Mat threShold(const cv::Mat &image);
}; #endif /* HISTOGRAM_H_ */
#include"Histogram1D.h"
Histogram1D::Histogram1D()
{
histSize[0]=256;
hranges[0]=0.0;
hranges[1]=255.0;
ranges[0]=hranges;
channels[0]=0;
};
cv::MatND Histogram1D::getHistogram(const cv::Mat &image)
{
cv::MatND hist;
cv::calcHist(&image,1,channels,cv::Mat(),hist,1,histSize,ranges);
return hist;
};
cv::Mat Histogram1D::getHistogramImage(const cv::Mat &image)
{
cv::MatND hist=getHistogram(image);
double maxVal=0;
double minVal=0;
cv::minMaxLoc(hist,&minVal,&maxVal,0,0);
cv::Mat histImg(histSize[0],histSize[0],CV_8U,cv::Scalar(255));
int hpt=static_cast<int>(0.9*histSize[0]);
for(int h=0;h<histSize[0];h++)
{
float binVal=hist.at<float>(h);
int intensity=static_cast<int>(binVal*hpt/maxVal);
cv::line(histImg,cv::Point(h,histSize[0]),cv::Point(h,histSize[0]-intensity),cv::Scalar::all(0));
}
return histImg;
};
cv::Mat Histogram1D::applyLookUp(const cv::Mat &image,const cv::Mat &lookup)
{
cv::Mat result;
cv::LUT(image,lookup,result);
return result;
}
cv::Mat Histogram1D::stretch(const cv::Mat &image,int minValue)
{
cv::MatND hist=getHistogram(image);
int imin=0;
for(;imin<histSize[0];imin++)
{
std::cout<<hist.at<float>(imin)<<std::endl;
if(hist.at<float>(imin)>minValue)
break;
}
int imax=histSize[0]-1;
for(;imax>=0;imax--)
{
if(hist.at<float>(imax)>minValue)
break;
}
int dim(256);
cv::Mat lookup(1,&dim,CV_8U);
for(int i=0;i<256;i++)
{
if(i<imin)lookup.at<uchar>(i)=0;
else if(i>imax)lookup.at<uchar>(i)=255;
else lookup.at<uchar>(i)=static_cast<uchar>(255.0*(i-imin)/(imax-imin)+0.5);
}
cv::Mat result;
result=applyLookUp(image,lookup);
return result;
}
cv::Mat Histogram1D::equalize(const cv::Mat &image)
{
cv::Mat result;
cv::equalizeHist(image,result);
return result;
}
cv::Mat Histogram1D::calcBack(const cv::Mat &image,const cv::MatND hist)
{
cv::Mat result;
cv::calcBackProject(&image,1,channels,hist,result,ranges,255.0);
return result;
}
cv::Mat Histogram1D::threShold(const cv::Mat &image)
{
cv::Mat thresholded;
cv::threshold(image,thresholded,0,255,cv::THRESH_BINARY);
return thresholded;
}
#include"Histogram1D.h" int main()
{
cv::Mat image=cv::imread("d:\\test\\opencv\\waves.jpg",0);
if( !image.data ) exit(0);
cv::Mat imageROI;
imageROI=image(cv::Rect(360,55,40,50)); cv::Mat back;
cv::Mat result; Histogram1D h;
cv::MatND hist=h.getHistogram(imageROI); namedWindow("hist");
imshow("hist",h.getHistogramImage(imageROI)); cv::normalize(hist,hist,1.0);
back=h.calcBack(image,hist);
result=h.threShold(back); namedWindow("Backprojection");
imshow("Backprojection",back); namedWindow("Detection Result");
imshow("Detection Result",result); waitKey(0);
return 0;
}
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