There's a few highly suspect details in the way the author got the 34-35 degree estimate. Maybe he was just really lucky and the errors cancelled out, but don't count on using his method to produce similar results. Polaris is about .8 degrees away from the celestial North pole, so using it alone can give a reading off by .8 degrees, and the orientation in the photo is actually nearing the worst case. The horizon does…
I extended many of the assumed parallel lines in the photo, and they all tend to converge just below and to the right of the nose of the plane. And using the known distance between two of the stars to estimate the degrees per pixel, I get a margin of error of about 4 degrees vertically estimating where the horizon is.
There's a few highly suspect details in the way the author got the 34-35 degree estimate. Maybe he was just really lucky and the errors cancelled out, but don't count on using his method to produce similar results. Polaris is about .8 degrees away from the celestial North pole, so using it alone can give a reading off by .8 degrees, and the orientation in the photo is actually nearing the worst case. The horizon does…
Interesting. So do you think the author had inside information on the location?
I'm not going to speculate on what someone did or didn't know, let's give him the benefit of the doubt and just say he was really lucky. My main point was just don't expect similar results if you try it yourself.
There's a few highly suspect details in the way the author got the 34-35 degree estimate. Maybe he was just really lucky and the errors cancelled out, but don't count on using his method to produce similar results. Polaris is about .8 degrees away from the celestial North pole, so using it alone can give a reading off by .8 degrees, and the orientation in the photo is actually nearing the worst case. The horizon does…
Interesting. So do you think the author had inside information on the location?
The fact that the b21 is being built at plant 42 in Palmdale has been public info for literal years.
There's a few highly suspect details in the way the author got the 34-35 degree estimate. Maybe he was just really lucky and the errors cancelled out, but don't count on using his method to produce similar results. Polaris is about .8 degrees away from the celestial North pole, so using it alone can give a reading off by .8 degrees, and the orientation in the photo is actually nearing the worst case. The horizon does…
If I were a betting man I would assume he started this exercise with the final assumed location in mind, and worked backwards from there to show how it could have been done.
It doesn’t fly yet, so that narrows it down a bit.
Do they’re trying to scare Russian with an airplane that can only be taxied around? I wonder if it’s made out of proper material and not just some clay concept
Russia military is a pitiful shell of the former Soviet glory. Putin’s actions in Ukraine have effectively demilitarized them. They squandered their inheritance of Soviet equipment like an 18 year old in Vegas. Their nuclear force is a giant question mark. Their three legs of the nuclear triad are quite shaky. In the event of a MAD exchange; Their boomers won’t get a missile off due to the fast attacks that keep them targeted at all times. Their bombers and cruise missiles have been depleted and their facilities are so insecure Ukraine is able to hit them with drones from the 70s. Maybe their ICBMs work, but given their culture of graft and corruption even that is doubtful. They are a joke.
There's a few highly suspect details in the way the author got the 34-35 degree estimate. Maybe he was just really lucky and the errors cancelled out, but don't count on using his method to produce similar results. Polaris is about .8 degrees away from the celestial North pole, so using it alone can give a reading off by .8 degrees, and the orientation in the photo is actually nearing the worst case. The horizon does…
Interesting. So do you think the author had inside information on the location?
The author notes in the writeup that an educated guess could be made with public details about who the manufacturer was.
What does an optimization algorithm have to do with a brute force search? Even if your image patch is small, without previous images to compare, you need to brute force the entire sky? And how can "fft trickery" reduce the attitude state to 1 unknown ? 1 unknown with what units ? Sorry but I suspect you are making all these up.
The claims from pifm_guy are reasonable. This is a scenario with extremely high coding gain[1]. The DC value of the sky can be removed by high pass filtering. Finding the rigid transform (rotation+translation) between two images captured by the same camera, assuming no distortion[2], assuming the image pair has substantial intersection, doesn't require calibration. Dropping the "same camera" and "substantial intersec…
I’m not trying to call you guys out. Just curious for more information. I would say I have enough knowledge about signal processing to be dangerous, as it’s quite adjacent to my job. But this isn’t clicking with me. Assuming we’re not including cameras outside the visible light spectrum, are there cameras that actually have enough dynamic range to capture a recoverable amount of information about stars against a bright sky? Beyond that, the original commenter takes about oversampling, but oversampling of what exactly? Intuition says that even with a high resolution sensor (like a modern iPhone) the visual size of a star would still be less than a single pixel. If my intuition there is correct, aren’t we spatially under sampling? The shutter is open for some period of time, so I guess you could say we’re temporally oversampling, but then we’re applying the same gain both to the stars and the sky, so that doesn’t seem to helpful. I feel like taking a high pass filter of a daylight sky would leave you with next to nothing save some of the sensor’s inherent noise. Are you discussing exquisite sensors or optics here? Genuinely curious.
I tried some basic google searches on the matter of recovering stats in daytime images but didn’t get much back.
This is fun to see. Reminds me of the capture the flag done on Shia LaBeouf’s Trump protest flag that 4chan got together to figure out it’s hidden location and stole his flag and replaced it with a Trump hat.
https://www.news.com.au/entertainment/celebrity-life/celebri...
Interesting. So do you think the author had inside information on the location?
I'm not going to speculate on what someone did or didn't know, let's give him the benefit of the doubt and just say he was really lucky. My main point was just don't expect similar results if you try it yourself.