Juno perijove 5, March 27, 2017 |
Juno perijove 5, March 27, 2017 |
Mar 16 2017, 10:24 PM
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Juno's perijove 5 is coming up less than two weeks from now - it's on March 27, 2017.
The target selection voting has started and is open until almost four days from now: https://www.missionjuno.swri.edu/junocam/voting?current A large part of the data volume will be reserved for polar time lapse sequences though. John Rogers has written a helpful summary of the upcoming perijove 5: https://www.britastro.org/node/9377 |
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May 20 2017, 02:07 AM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Youtube upload of Perijove-05 animation completed.
Youtube refused my AVI version; so I needed to upload a terribly large 500 MB+ MOV file. However, quality may have suffered a bit in the youtube version. The bluish-green can be of at least two reasons: - Jupiter's haze appears to be bluish, especially when seen from acute angles, and near the poles. - Some portions of some of the images are saturated in the red filter band, resulting in a cast to the complementary color, i.e. greenish-bluish. This risk has been taken, in order to obtain better S/N. |
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May 21 2017, 03:51 PM
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#3
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
Youtube upload of Perijove-05 animation completed. This is really very promising. A couple of hopefully constructive criticisms: 1 ) you might consider cross-fading between images instead of cutting. There's at least one place where the cutting leaves you with a disorienting black image, I assume because the image coverage hasn't caught up to the spacecraft position. 2) your processing has become quite excellent except for the color. I'm not sure what's going on with the color but I don't think Jupiter is ever that green. Our missionjuno processing just does an auto white-balance after delambertianing and often leaves blue artifacts near the limb and terminator, but not the overall strong blue-green cast. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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May 21 2017, 06:29 PM
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#4
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
This is really very promising. A couple of hopefully constructive criticisms: Thanks! The list of basic image processing components I've been planning since months or even years is shrinking gradually. So, I'm going to be open for suggestions, and if it's just for prioritizing my scheduled tasks. 1 ) you might consider cross-fading between images instead of cutting. I've an older version of code which blends renditions of two images directly from the raws, but didn't yet find time to adjust this code to the changes I've made for a single raw. I may entirely replace this code by just blending two overlapping sequences. The decision to cutting has just been a matter of available time. I'll consider your point in my priorities. There's at least one place where the cutting leaves you with a disorienting black image, I assume because the image coverage hasn't caught up to the spacecraft position. Yes, that's the main reason. I just guessed the latitude coverage of each image with respect to time. Adding some more frames of #105 before starting #106 would have reduced this effect. I've also changed the software during rendition due to visible numerical jiggering effects and performance aspects, but intruduced a flaw, and another numerical difference between the two program versions. This led to different exposure and illumination adjustment. Eventually the movie became less smooth as it could have been. But rendering it anew would have taken another week, and I fully understood the root cause only lately. I'm expecting these effects and difficulties to be absent or solved in my scheduled PJ06 flyby movie, since the accoring flaws are fixed now, and we have better latitude coverage. 2) your processing has become quite excellent except for the color. I'm not sure what's going on with the color but I don't think Jupiter is ever that green. Our missionjuno processing just does an auto white-balance after delambertianing and often leaves blue artifacts near the limb and terminator, but not the overall strong blue-green cast. For this sequence, I didn't auto white-balance, but used your lab values (hopefully corrrectly). The stills for the movie are gamma-stetched with gamma=8 with respect to square-root encoding, hence the 4th power of illumination-adjusted radiometric values. This might enhance a subtle bluish cast to an obvious blue or blue-green hue. Besides this, some portions of some of the images may be saturated in the red band, leading to loss of red, and hence to a green-blue hue. I didn't try to correct saturated color channels. I'm strongly considering, that Jupiter's haze is mostly bluish. This shows up near the limb, near the terminator, and overall within the polar haze disks. I hesitate to adjust color weights by expections what a color of an unknown target should be. Analysing the optical properties of the haze is on my list. (We may discuss this in the context of the talk(s) I'm going to prepare for Riga.) |
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