本文整理汇总了C++中CImgList::get_FFT方法的典型用法代码示例。如果您正苦于以下问题：C++ CImgList::get_FFT方法的具体用法？C++ CImgList::get_FFT怎么用？C++ CImgList::get_FFT使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类CImgList的用法示例。
在下文中一共展示了CImgList::get_FFT方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: main
int main() {
//Reading the image
const CImg<double> img = CImg<double>("marilyn1.png").resize(256,256).save("original.png");
//Applying fourier transform. Referenced it frm CImg.h.
//Returns list in 0 and 1 column. We assummed the values in 0 column are magnitude and 1 column are phase
CImgList<double> F = img.get_FFT();
//FFT Shift. Referenced from CImg.h
cimglist_apply(F,shift)(img.width()/2,img.height()/2,0,0,2);
complex<double> H[256][256]; //Complex double array for saving Gaussian mask
double D0,D;
double B[65536]; //65536 is the total number pixels available in the image
double S[65536];
//Calculating the gaussian mask. Magnitude and the Phase values are saved in seperate arrays.
//Referenced from Online source. The mask is for low pass filter.
int i = 0;
for ( int u = 0; u < img.width() ; u++){
for ( int v = 0; v < img.height() ; v++){
D0 = 15;
D = sqrt(pow((double)u - ((double)img.width()/2),2) + pow((double)v - ((double)img.height()/2),2));
H[u][v] = exp(complex<double>(0.0,-(double)((double)pow(D, 2)/ (double)(2* pow(D0,2)))));
B[i] = std::abs(H[u][v]);
S[i] = std::arg(H[u][v]);
i++;
}
}
printf("%d",i);
//Multiplying the Magnitude of Gaussian Mask with Magnitude of FFT result
for (int z=0; z< i; z++)
{
F[0][z] = (F[0][z]*B[i]);
}
//Taking Inverse FFT of the Result
CImgList<double> FT = F.get_FFT(true);
const CImg<double> mag = ((FT[0].get_pow(2) + FT[1].get_pow(2)).sqrt() + 1).log().normalize(0,255);
CImgList<double> visu(img,mag);
mag.save("fftimage.png");
}