OpenCV Q&A Forum - RSS feedhttp://answers.opencv.org/questions/OpenCV answersenCopyright <a href="http://www.opencv.org">OpenCV foundation</a>, 2012-2018.Tue, 26 May 2015 03:05:06 -0500spatial frequency corresponding to the image planehttp://answers.opencv.org/question/62599/spatial-frequency-corresponding-to-the-image-plane/ Hi everybody
I am doing image filtering in frequency domain, and I need to find the frequency of each image pixel . the only thing I know about the image is size of image for example: (225, 225)
There is a function in python "np.fft.fftfreq" to calculate frequencies, but two question arises here:
1. Using this function, I have to find the frequency in x and y direction , so two numbers, but i need one number for each pixel (I need a matrix the same size as image fill with frequencies correspond to the image pixels)?
2. it starts with zero!!! but as I know after shifting fft, DC component is in the middle so why zero at the beginning?
if anybody knows another way to calculate the frequencies, more than welcome :)
feryTue, 26 May 2015 03:05:06 -0500http://answers.opencv.org/question/62599/