[X] My Assistant

[tfisher]

I've been playing with the released raw ISS images (thanks to Bjorn for the img2png program!) trying to produce a better image near Huygen's descent location.

Here's what I've come up with. I started with images from two different imaging sequences, applied a Fourier bandpass filter, and stacked the images from the same pass. Because of different lighting conditions, or atmospheric conditions, or something, the images are significantly different, so I combined them as red and blue layers instead of just stacking further. Green is produced by the product of red and blue chanels, and a further contrast adjustment is also made.


I believe Huygens descent location is in the upper left corner. The correspondence with one of Rene's beautiful mosiacs is given here:


Unfortunately the geometry is different enough I can't really overlay the mosaic with the ISS image...

[Phil Stooke]

tfisher - I hate to say it but I can't see any linear features at all in your image. And the fade suggested to me a less than perfect registration. So I must ask, how much confidence do you have that your line (1) actually exists, and (2) is correctly positioned? One problem to be aware of is that our eye/brain system is predisposed to see lines and patterns in complex textures - look at stucco, or even defocussed text on a page, and you will see lines. The more you look the more you see. I've been guilty of it myself.

Phil

[tfisher]

tfisher - I hate to say it but I can't see any linear features at all in your image.

Yeah, I worried quite a lot about the alignment, until I convinced myself there were enough things that lined up. Here is the location I see a line, with only images from one pass stacked, as a gif so no compression artifacts. Maybe "subtle" is a better word than "prominent", but I'm pretty sure I'm not completely imagining it.



It shows as dark against the lighter background above the central island or peninsula, and again as dark against the lighter island at the right. In between, it seems to still be there, though the graininess of the surroundings makes it harder to see.