CTF

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CTF(Contrast Transfer Function)

　Contrast Transfer Function is the defined function that by Wave-number Space (Reciprocal lattice Space) that represents how to transfer by observation the value (Complex number: and it has the intensity and phase) of each spatial resolution that the true image has.

Example of affected Fourier image by CTF

Example1

Input-1point.png
true image

----->
FFT

Input-1point-FFT.png
true image(Fourier image)

----->
CTF

Input-1point-CTF.png
affected image by CTF


Example2

Input-grid.png
true image

----->
FFT

Input-grid-FFT.png
true image(Fourier image)

----->
CTF

Input-grid-CTF.png
affected image by CTF


Example3

Input-B120.png
true image

----->
FFT

Input-B120-FFT.png
true image(Fourier image)

----->
CTF

Input-B120-CTF2-FFT.png
affected image by CTF
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