Conor Sayres (UW) and I continued today our discussion of the data-analysis challenges associated with the SDSS-V focal-plane system (the fiber robots). Today we discussed the microscopy of the robots. Sayres has images (like literally RGB JPEG images) from a setup in which each fiber robot is placed into a microscope. From this imaging, we have to locate the three fibers (one for the BOSS spectrograph, one for the APOGEE spectrograph, and one for a back-illumination system used for metrology, all relative to the outer envelope of the robot arm. And do this for 300 or 600 robots. The fibers appear as bright, resolved circles in the imaging, but on a background that has lots of other detail, shading, and variable lighting. This problem is one that comes up a lot in astrophysics: You want to measure something very specific, but in a non-trivial image, filled with other kinds of sources and noise. We discussed options related to matched filtering, but we sure didn't finish.
No comments:
Post a Comment