这个程序是由多张人脸生成特征脸
#if 1
#include <opencv2\contrib\contrib.hpp>
#include <opencv2\core\core.hpp>
#include <opencv2\highgui\highgui.hpp>
#include <iostream>
#include <fstream>
#include <sstream>
using namespace std;
using namespace cv;
static Mat norm_0_255(cv::InputArray _src)
{
Mat src = _src.getMat();
Mat dst;
switch(src.channels())
{
case 1:
cv::normalize(_src, dst, 0, 255, cv::NORM_MINMAX, CV_8UC1);
break;
case 3:
cv::normalize(_src, dst, 0, 255, cv::NORM_MINMAX, CV_8UC3);
break;
default:
src.copyTo(dst);
break;
}
return dst;
}
static void read_csv(const string &filename, vector<Mat> &images, vector<int> &labels, char separator = ';')
{
std::ifstream file(filename.c_str(), ifstream::in);
if(!file)
{
string error_message = "No valid input file was given.";
CV_Error(CV_StsBadArg, error_message);
}
string line, path, classlabel;
while(getline(file, line))
{
stringstream liness(line);
getline(liness, path, separator); //遇到分号就结束
getline(liness, classlabel); //继续从分号后面开始,遇到换行结束
if(!path.empty() && !classlabel.empty())
{
images.push_back(imread(path, 0));
labels.push_back(atoi(classlabel.c_str()));
}
}
}
int main(int argc, char *argv[])
{
string output_folder;
output_folder = string("D:\\ORL\\result");
//读取你的CSV文件路径
string fn_csv = string("D:\\ORL\\to\\at.txt");
//两个容器来存放图像数据和对应的标签
vector<Mat> images;
vector<int> labels;
try
{
read_csv(fn_csv, images, labels);
}
catch(cv::Exception &e)
{
cerr<<"Error opening file "<<fn_csv<<". Reason: "<<e.msg<<endl;
exit(1);
}
//如果没有读到足够的图片,就退出
if(images.size() <= 1)
{
string error_message = "This demo needs at least 2 images to work.";
CV_Error(CV_StsError, error_message);
}
//得到第一张照片的高度,在下面对图像变形到他们原始大小时需要
int height = images[0].rows;
//移除最后一张图片,用于做测试
Mat testSample = images[images.size() - 1];
cv::imshow("testSample", testSample);
int testLabel = labels[labels.size() - 1];
images.pop_back();
labels.pop_back();
/*
* 下面创建一个特征脸模型用于人脸识别,
* 通过CSV文件读取的图像和标签训练它。
*/
cv::Ptr<cv::FaceRecognizer> model = cv::createEigenFaceRecognizer();
model->train(images, labels);
/*
* 下面对测试图像进行预测,predictedLabel 是预测标签结果
*/
int predictedLabel = model->predict(testSample);
string result_message = format("Predicted class = %d / Actual class = %d.", predictedLabel, testLabel);
cout<<result_message<<endl;
//获取特征脸模型的特征值的例子,使用了getMat方法
Mat eigenvalues = model->getMat("eigenvalues");
//获取特征向量
Mat W = model->getMat("eigenvectors");
//得到训练图像的均值向量
Mat mean = model->getMat("mean");
imshow("mean", norm_0_255(mean.reshape(1, images[0].rows)));
cv::imwrite(format("%s/mean.png", output_folder.c_str()), norm_0_255(mean.reshape(1, images[0].rows)));
//实现并保存特征脸
for(int i=0; i <min(10, W.cols); i++)
{
string msg = format("Eigenvalue #%d = %.5f", i, eigenvalues.at<double>(i));
cout<<msg<<endl;
Mat ev = W.col(i).clone();
//把他变成原始大小,为了把数据显示归一化到0-255.
Mat grayscale = norm_0_255(ev.reshape(1,height));
//使用伪彩色来显示结果
Mat cgrayscale;
cv::applyColorMap(grayscale, cgrayscale, COLORMAP_JET);
imshow(format("eigenface_%d", i), cgrayscale);
imwrite(format("%s/eigenface_%d.png", output_folder.c_str(), i), cgrayscale);
}
//在预测过程中,显示并保存重建后的图片
for(int num_components = 10; num_components < 390; num_components += 15)
{
//从模型中的特征向量截取一部分
Mat evs = Mat(W, Range::all(), Range(0, num_components));
//投影
Mat projection = cv::subspaceProject(evs, mean, images[0].reshape(1,1));
//重构
Mat reconstruction = cv::subspaceReconstruct(evs, mean, projection);
reconstruction = norm_0_255(reconstruction.reshape(1, images[0].rows));
imshow(format("eigenface_reconstruction_%d", num_components),reconstruction);
imwrite(format("%s/eigenface_reconstruction_%d.png", output_folder.c_str(),num_components), reconstruction);
}
cv::waitKey(0);
return 0;
}
#endif