cv::Mat ButFIlt(cv::Mat src){
cv::Mat padded;
int m=cv::getOptimalDFTSize(src.rows);
int n=cv::getOptimalDFTSize(src.cols);
cv::copyMakeBorder(src,padded,0,m-src.rows,0,n-src.cols,cv::BORDER_CONSTANT,cv::Scalar::all(0));
padded=dft2Shift(padded);
cv::Mat planes[]={padded,cv::Mat::zeros(padded.size(),CV_32F)};
cv::Mat complexI;
cv::merge(planes,2,complexI);
cv::dft(complexI,complexI);
cv::split(complexI,planes);
// cv::magnitude(planes[0],planes[1],planes[0]);
cv::Mat BLPF=getBLPF(m,n);
cv::multiply(planes[0],BLPF,planes[0]);
cv::multiply(planes[1],BLPF,planes[1]);
cv::merge(planes,2,complexI);
cv::idft(complexI,complexI);
cv::split(complexI,planes);
cv::Mat magI=dft2Shift(planes[0]);
magI+=cv::Scalar::all(1);
cv::log(magI,magI);
cv::normalize(magI, magI, 255,0, cv::NORM_MINMAX);
magI.convertTo(magI,CV_8U);
cv::Mat timg=magI(cv::Range(0,src.rows),cv::Range(0,src.cols));
return timg;
}
extern void run(OpenCVWindow * window) try{
const auto images_names=
CoreUtility::getConfigurationFile().getInputImagesNames("images:000001");
assert(images_names.size());
QImage image_input(images_names.first());
image_input=image_input.convertToFormat(QImage::Format_Grayscale8);
window->insertImage(image_input)->setWindowTitle(u8"原始图像"_qs);
cv::Mat mat_input=OpenCVUtility::tryRead(image_input);
assert( mat_input.channels() == 1 )/*这应当是一个灰度图像*/;
/*计算获得dft变换所需要的长宽*/
auto height_ = cv::getOptimalDFTSize(mat_input.rows);
auto width_ = cv::getOptimalDFTSize(mat_input.cols);
cv::Mat dft_real;
/*扩展边界*/
cv::copyMakeBorder(mat_input,dft_real,
0/*top*/,height_-mat_input.rows/*bottom*/,
0/*left*/,width_-mat_input.cols/*right*/,
cv::BORDER_CONSTANT,cv::Scalar::all(0)
);
dft_real.convertTo(dft_real,CV_64FC1);
cv::Mat dft_imag=cv::Mat::zeros(dft_real.size(),CV_64FC1);
{
cv::Mat dft_output;
cv::merge(
std::vector<cv::Mat>{ dft_real,dft_imag},
dft_output);
/*进行dft变换*/
cv::dft(dft_output,dft_output);
cv::split(dft_output,std::vector<cv::Mat>{ dft_real,dft_imag});
}
cv::Mat magI ;
cv::magnitude(dft_real,dft_imag,magI);
magI+=1;
cv::log(magI,magI);//取对数
magI= magI(cv::Rect(0,0,width_,height_));
cv::normalize(magI,magI,0,255,CV_MINMAX);
window->insertImage( OpenCVUtility::tryRead(magI ) )
->setWindowTitle(u8"变换后图像"_qs);
{
const auto w_2=width_/2;
const auto h_2=height_/2;
cv::Mat q0(magI,cv::Rect(0,0,w_2,h_2));
cv::Mat q1(magI,cv::Rect(w_2,0,w_2,h_2));
cv::Mat q2(magI,cv::Rect(0,h_2,w_2,h_2));
cv::Mat q3(magI,cv::Rect(w_2,h_2,w_2,h_2));
cv::flip(q0,q0,-1);
cv::flip(q1,q1,-1);
cv::flip(q2,q2,-1);
cv::flip(q3,q3,-1);
}
window->insertImage( OpenCVUtility::tryRead(magI ) )
->setWindowTitle(u8"中心化后图像"_qs);
}
catch (const cv::Exception &e) {
opencv_exception::error(e,"get opencv exception",opencv_line(),opencv_file(),opencv_func());
}