ctf model ramp weighting correction and updated interpolation center #141
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…qual to setting 0 freq in fourier transform to 0
… up to overlap freq should be most accurate
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And I updated the version to 0.5.0 to cut a release with this update! |
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Minimum allowed coverage is Generated by 🐒 cobertura-action against 36514aa |
sroet
requested changes
Mar 6, 2024
Co-authored-by: Sander Roet <[email protected]>
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This PR updates internal code in _create_tilt_weighted_wedge to create a more precise weighting function.
First I add a linear weighting up to the point where tilt image overlap in Fourier space. This now allows summation of the tilts instead of doing a maximum operation. It reduces aliasing artifacts quite a lot:
Before:
After:
The second update (which is also visible in the image, but difficult to see), is that I changed the interpolation center when tilting the images. I switched to voltools instead of ndimage.rotate as this allows me to set the center to the origin in Fourier space, while ndimage.rotate instead uses (shape - 1) / 2, which is not correct for fourier space. In the above image the wedge is shifted one pixel to the left. But this can be quite crucial for the overlap of low frequencies between the tomo and template.