1. The frequency spectrum of the image is how to display?
For an raw8 chart, a pixel value is composed of an 8-bit binary, and for a raw10 image pixel is composed of 10 bit binary number, all the pixels are combined into an image, then the Fourier transform of the image is of all pixels in the Fourier transform? But after transformation is complex, the spectrum is how said? Is made up by a single pixel? The plural also can represent color?

2. The Matlab is how to carry on the Fourier transform of image?
For an image pixel is 1 m, if all the pixel to the Fourier transform, the time complexity is O (n ^ 3), is a large amount of calculation, even using FFT computation is not small, so what is the use in Matlab algorithm can quickly get an image of the spectrum?

Just graduated in more than three months, recently, inadvertently see Fourier transform of the image processing of data, interest, want to understand the alternative work content multifarious don't have too much time to study, so want to be a stretch hand to the party with you take the great god, I hope you give a certain answer, thank you!

CodePudding user response:

http://www.360doc.com/content/10/1128/20/2226925_73234298.shtml

CodePudding user response:

reference 1st floor zgl7903 response:

http://www.360doc.com/content/10/1128/20/2226925_73234298.shtml

hello I use the cell phone can't open the link, I evening back to use the computer to see, thank you!

CodePudding user response:

1. Try to decoupling between image formats and algorithm, to guarantee the generic algorithm, in order not to loss of information, can be expanded upward level, for example with 8-bit grayscale, RGB with 24 said, unless you have special need,
2. The Fourier transform of the image is first in fA (,) do each of FFT and output to the fB (,), then the fB do each column of the FFT (,), get the final output,
3. Output the result of complex number, you can use two space to store respectively, and then will come to the conclusion after observation, as a result, the real is that we want to use of the
4. The complexity of the FFT has been accepted by the industry, don't worry too much about,
5. The FFT Matlab code on the Internet a lot of, next to slightly modified FFT image can make it,