Bug #727
closed
incorrect angles in saxton scheme
Added by Scott Stagg over 14 years ago.
Updated almost 7 years ago.
Affected Version:
Appion/Leginon 2.0.1
Description
We discovered an error in Leginon Tomography when using equally sloped angles. The algorithm that calculates the angles does indeed make the tilt increment smaller with increasing tilts, but we found that above a certain point, the tilt increment starts increasing again at the highest tilts. I have attached a plot of the tilt increment vs. tilt angle to illustrate the problem.
Files
- Status changed from New to Assigned
- Assignee set to Anchi Cheng
- Status changed from Assigned to In Code Review
- Assignee changed from Anchi Cheng to Jim Pulokas
- % Done changed from 0 to 100
Implement what I think is Saxton scheme in r14465. r14466 is the gui change for it. No longer using power of 2 for determining the number of tilts per direction. Use an iterative refinement method since it is quite fast and since I can't work out the math to solve it.
Scott should to the testing.
That seems to have worked. The attached plot looks more like what we'd expect.
Checked the original paper for the correctness of the tilts. Commit to branch 2.0 as r14652. This issue can be closed if Jim does not or does not want to find more efficient algorithm.
- Target version set to Appion/Leginon 2.0.3
- Status changed from In Code Review to Closed
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