Fourier Transform + emgucv
Can anybody tell me what is the problem in this code...
Basically I am trying to compute the dft of the image and show it as an image on my screen.
Image<Gray, float> GreyOriginalImage = new Image<Gray, float>(strFileName);
Matrix<float> imageMat = new Matrix<float>( CvInvoke.cvGetOptimalDFTSize( GreyOriginalImage.Rows ) , CvInvoke.cvGetOptimalDFTSize( GreyOriginalImage.Cols ) );
GreyOriginalImage.CopyTo( imageMat.GetSubRect( GreyOriginalImage.ROI ) );
CvInvoke.cvDFT( imageMat , imageMat , Emgu.CV.CvEnum.CV_DXT.CV_DXT_FORWARD , imageMat.Rows );
GreyFourierImage = new 开发者_JAVA技巧Image<Gray, float>( imageMat.Rows , imageMat.Cols );
imageMat.CopyTo( GreyFourierImage );
ImageBox2.Image = GreyFourierImage;
imageBox2.Show();
The problem is that the code hangs up while executing and no image gets shown....
I am using Visual studio 2010 with emgu cv.
Well I've gone over your code and debugged it the problem line is here:
imageMat.CopyTo( GreyFourierImage );
You are trying to copy imageMat which is a float[,] array to an image float[,,*] I'm sure you can figure out that this just doesn't work and is why the program hangs.
Here is the code that splits the Imaginary and Real parts from cvDFT:
Image<Gray, float> image = new Image<Gray, float>(open.FileName);
IntPtr complexImage = CvInvoke.cvCreateImage(image.Size, Emgu.CV.CvEnum.IPL_DEPTH.IPL_DEPTH_32F, 2);
CvInvoke.cvSetZero(complexImage); // Initialize all elements to Zero
CvInvoke.cvSetImageCOI(complexImage, 1);
CvInvoke.cvCopy(image, complexImage, IntPtr.Zero);
CvInvoke.cvSetImageCOI(complexImage, 0);
Matrix<float> dft = new Matrix<float>(image.Rows, image.Cols, 2);
CvInvoke.cvDFT(complexImage, dft, Emgu.CV.CvEnum.CV_DXT.CV_DXT_FORWARD, 0);
//The Real part of the Fourier Transform
Matrix<float> outReal = new Matrix<float>(image.Size);
//The imaginary part of the Fourier Transform
Matrix<float> outIm = new Matrix<float>(image.Size);
CvInvoke.cvSplit(dft, outReal, outIm, IntPtr.Zero, IntPtr.Zero);
//Show The Data
CvInvoke.cvShowImage("Real", outReal);
CvInvoke.cvShowImage("Imaginary ", outIm);
Cheers,
Chris
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