[PIPE2D-474] Position of center of light gets moved in PSF postprocessing Created: 13/Nov/19 Updated: 14/Nov/19 Resolved: 14/Nov/19 |
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| Status: | Done |
| Project: | DRP 2-D Pipeline |
| Component/s: | None |
| Affects Version/s: | None |
| Fix Version/s: | None |
| Type: | Task | Priority: | Normal |
| Reporter: | ncaplar | Assignee: | ncaplar |
| Resolution: | Done | Votes: | 0 |
| Labels: | None | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Attachments: |
Center moving.png
Center_stays_same.png
Dif_center_centroid.png
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| Story Points: | 4 | ||||||||
| Sprint: | 2DDRP-2019 J | ||||||||
| Description |
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During the debates about centering and positions of the 2d PSF I have repeatedly claim that my PSF is centered so that the chief ray is the center of the created image. This is true for the pure PSF which I create, but afterwards I apply ``postprocessing'' where I convolve the image with the fiber size, grating effects, scattering and charge diffusion. All of these effects are symmetric and should not modify the center of light. Observing the result we see that this is not the case. This is probably because I was not careful about this, as centering was never issue for me until now. |
| Comments |
| Comment by ncaplar [ 14/Nov/19 ] |
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Modify my PSF 2D code (updated to internal version 0.23). For perfectly illuminated pupil, without any abberations, the center of light aligns exactly in the center of the array. For 211x211 array, the center of light is at pixel 105. |
| Comment by ncaplar [ 14/Nov/19 ] |
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I also added the image showing the difference between the position of the chief ray and the center of light.
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