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Originally posted by rogi22
Check out this one from today, again two "objects" in the same places as the pic from the 23rd this month. One at 11 oclock and one at 4.
Compression artifacts in the same places?
Surley after seeing that image the case is closed . Obviously data malfunction of some kind. Can anyone get that picture loaded on to this thread for all to see. I would but am on smart phone. Cheers.
Originally posted by the.lights
Err, what the.....!!!!
stereo-ssc.nascom.nasa.gov...
Dear Mr. Andrews - (Sorry not to make this more original, but we've had a number of questions about these features since the Deep Space Network Central Data Recorder (CDR) failure last week, and this is a cut-and-paste that I've been using to reply to a lot of them.
No disrespect intended, but very busy currently with writing proposals for a Senior Review that decides whether to continue funding our missions.
Please let me know if this isn't comprehensible.)
What you're seeing are compression artifacts, highly magnified. We have to compress the images digitally in order to keep a good rate of taking them and still be able to telemeter them back (across an increasing distance, which weakens the signal and limits how much data we can send per unit time) to earth.
The images you are looking at in the video are "space weather beacon mode" images that are telemetered down nearly continuously: stereo-ssc.nascom.nasa.gov... in near-realtime, and are both binned (undersampled spatially, down to 512 x 512 pixels) and heavily, lossily compressed digitally onboard (analogous to the various JPEG compression settings on a digital camera, but much more severe). Then they're made available on the Website in a variety of magnifications or "upresings" which only magnify the artifacts.
Usually, by now (that is, three days or more after the data were obtained), we'd have the full-resolution (2048 x 2048 pixel) images, which are much less heavily, but still lossily, compressed, and are played back to a Deep Space Network (DSN) ground station via the high-gain antenna on one of the STEREO spacecraft. Unfortunately, a piece of ground hardware at DSN failed, and we're only now catching up on the full-resolution data from January 18 onward --- except the lower-resolution (512 x 512) beacon mode data.
People first started seeing the odd images around that date, when there was a moderate solar energetic particle event, but those up-resed images have now been replaced on the SSC Website with the full resolution ones. DSN has caught us up to January 20, the last time I checked.
The compression artifacts are particularly obvious when a particle (cosmic ray or solar energetic, charged particle) hits the CCD detector on the spacecraft head-on. (Grazing hits show up as bright streaks.) The compression scheme has a hard time mathematically representing sharp, single- or few-pixel features, and you get a characteristic pattern of a bright dot in the middle of a compression block (a subsection of the image) surrounded by a pattern of dark dots.
Best, Joe Gurman (Dr.) Joseph B. Gurman STEREO Project Scientist
Originally posted by TrueBrit
reply to post by Genuine_UFOs
Hate to say this, but the idea of yours isnt new. Its been the driving force behind many works of fiction , and has been mentioned in relation to cattle mutilations.
However, I think before we get to the subject of who the pilots are, we might be better off concentrating our efforts on confirming the presence of these objects and thier authenticity . That would seem a more pressing matter for the moment , would you not agree?
Originally posted by tarifa37
Surely after seeing that image the case is closed . Obviously data malfunction of some kind. Can anyone get that picture loaded on to this thread for all to see. I would but am on smart phone. Cheers.
Originally posted by the.lights
Err, what the.....!!!!
stereo-ssc.nascom.nasa.gov...
And if these were objects and not image errors, wouldn't the highlights appear at a rotation more anticlockwise to what we see in the 1st pic instead of the light coming from directly below?