Name

ctf_img - create a complex 1-2-3-D image with `CTF`.

Usage

ctf = ctf_img(nx, pixel_size, defocus, voltage, cs, amp_contrast, b_factor, sign, ny, nz) Defult is 2D image

Input

nx

x image size.

pixel_size

pixel size in `Å`.

defocus

defocus in `Å`.

voltage

microscope voltage in kV (default 300 kV).

cs

Spherical aberration constant in mm. (Default 2.0)

amp_contrast

Amplitude contrast ratio, a unitless number in range of (0,1). (Default 0.1)

b_factor

B-factor defining exponential decay of Fourier amplitudes decay with unit 1/`Å^2`. (Default 0.0, i.e., no decay). (See filt_ctf for definition).

sign

sign of the CTF. If cryo data had inverted contrast, i.e., images were multiplied by -1 and particle projections appear bright on dark background, it has to be set to -1). (Default -1).

ny

y image size (default nx = ny).

nz

z image size (default nz =1 ).

Output

ctf

complex image containing `CTF`.

Description

• 1. See filt_ctf for more information about `CTF`

• 2. See ali2d_w for more information about Wiener Filter

Method

Reference

Author / Maintainer

• Zhong Huang

Keywords

category 1

MORPHOLOGY

Files

morphology.py

See also

ctf_2, ali2d_w, ctf_1, filt_ctf

Maturity

stable

works for most people, has been tested; test cases/examples available.

Bugs

None. It is perfect.