[X] My Assistant

[mcaplinger]

Some of the images have been posted on missionjuno.

You will immediately notice that there is something weird about them. Yes, we know about this, and I'll say more about it when I can. In the meantime, anything people can do to process them would be appreciated. I've had some success using https://github.com/chunglabmit/pystripe

[Bjorn Jonsson]

I have been making nice progress with the PJ56 images. This is image PJ56_140 at several different processing levels. The amount of processing increases from [a] to [d]. The images are illumination adjusted.




A short description of how the processing differs from [a] to [d]:

[a] Destriped using code based on a description of what the ISIS3 dstripe application does. I experimented with several different destripe parameters.
[b] Crude color correction in the purple areas.
[c] Green and blue channels modified to reduce noise. Here the green channel is a combination of a low pass filtered green image and high pass filtered red image.
The blue channel is a combination of a low pass filtered blue image and high pass filtered green image.
[d] Enhanced contrast and color saturation.

Keeping in mind what the original data looks like, I'm a bit surprised by the good quality of the red channel data here. However, the blue channel is almost useless in the darkest areas at right.

And for completeness, a version that is supposed to be an approximately true color/contrast image. However, the color is preliminary and probably significantly less accurate than in images from earlier orbits.

[mcaplinger]

I have been making nice progress with the PJ56 images.

Thanks for doing this, Bjorn. Your results are impressive, and it makes me more optimistic that the PJ57 Io images will be useful.

You're certainly right that the blue channel is most badly affected.

[Brian Swift]

You're certainly right that the blue channel is most badly affected.

I wonder if there could be value in acquiring blue-only higher-TDI images.
And also wonder, if red-green images were collected, could imaging cadence be increased to once per rotation (with the idea of having more images to average together to beat down random noise.)

[mcaplinger]

I wonder if there could be value in acquiring blue-only higher-TDI images.

If there was something important enough about the blue channel to make up for the costs of reduced imaging cadence, extra processing, etc, then sure.

And also wonder, if red-green images were collected, could imaging cadence be increased to once per rotation...

No, not for any image larger than 20 or so frames. You have to acquire all of the frames into JDEA DRAM and then transfer them all to the spacecraft before starting the next image.

(And I've just noticed an error in the Junocam paper -- it says "the data interface is a unidirectional three-signal RS-422 synchronous interface running at 20 Mbits/s" but the correct number is 4 Mbits/s.)