Questions tagged [image-processing]
The image-processing tag has no usage guidance.
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Strange swirls on the latest image from SOHO
Earlier today, I was looking at the latest image from SOHO and noticed some odd swirly lines at the bottom left of the image. They no longer appear on the site, but I saved the image before they were ...
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JWST - image acquisition - what is a dither pattern?
While perusing one of the sample science programs for the JWST (NIRCam WFSS Deep Galaxy Observations), I came across Step 5, “Decide on dither pattern.”
Instead of guessing — or worse, assuming — what ...
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JWST - image stabilization?
I am curious about how the JWST accomplishes image stabilization. This paper from 2005 addresses this, but a more general high-level description of the processes would be helpful, from someone with ...
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Diffraction artifact on the March 16, 2022 JWST aligned test image
On March 16, 2022 we were treated to the first image from the JWST of a star, where all 18 segments were aligned and in common focus. What a wonderful photo:
(Source: Webb Twitter. Full 18 MP ...
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New Horizons MVIC/Ralph colour channel image alignment
I'm working with some New Horizons MVIC/Ralph data. I'm taking the red, blue, and NIR channel data and create a false colour image, like this:
(PDS Label of Red Channel image, accessed from OPUS)
...
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Which aspects of the JWST wavefront process are the most time-consuming?
NASA is currently estimating the that the upcoming wavefront process to align the JWST's mirror segments will take around three months.
This description of the WFSC process paints a picture of ...
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How to transform from the spacecraft coordinate system to image coordinates?
Assume e.g. that in the spacecraft coordinate system, I have a target vector
$ \vec{p_\text{t}} = \begin{pmatrix} -11.980\\ -68.051\\ 55.031 \end{pmatrix}\text{km}$,
which is related to the Earth Mean ...
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Help me understand these tweeted images of JWST moving through Orion!
@nealmcb's answer to Which direction/constellation is the James Webb is headed towards is "Orion" and links to twitter via
Update: See photo of JWST in Orion by @Skysurfer77x - amazing!
I ...
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2
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If all Starlink satellites had phone tier cameras & simple scopes, could images processed by their super-resolution imaging network be competitive?
I was wondering; if all Starlink satellites had high-end cellphone quality cameras modules on simple telescopes, could the resulting images be combined and processed in such a way that a super-...
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Which parameters to use with FFMPEG to rectify Mars Ingenuity helicopter images? [closed]
I know how to convert a fisheye image to equirectangular, to view it inside a 3D VR viewer as a "panorama":
...
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What image compression algorithm did the Voyagers use?
Recently, Reed-Solomon error correction codes were discussed: How is stacking oranges in 24 dimensions related to receiving and decoding signals from the Voyagers?
Whilst the craft were between ...
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How big would a QR code have to be on my roof for a satellite to be able to scan it given today's allowable resolution?
Say, using the Planet Labs satellites
Thank you
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Why is the along track resolution of the MRO's SHARAD limited to >300m?
I've been reading about the SHAllow RADar instrument on the Mars Reconnaissance Orbiter, but I am struggling to understand why the along track resolution of its radargrams is so large.
As I ...
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How did the TIROS video tape recorders record and playback images rather than audio; how were the signals modulated?
(At least) one answer to How were video tape recorders adapted to work in orbit in 1962? argues that the recorder should not be called a "video" tape recorder because the record/playback ...
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How can stellar images be "subtracted" from a sequence of exposures? (difference imaging)
The press release UH ATLAS telescope discovers first-of-its-kind asteroid from the Institute of Astronomy at the University of Hawaii shows an image of an "active asteroid" among a field of stars. ...
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what C/C++ image processing libraries are used on-board satellites/rovers?
Given that a full blown linux is rarely used in spacecrafts, can popular image processing libraries like opencv be use in space applications?
Since radiation hardened processors are much less capable ...
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Solar system sized telescope and resolving details of the M87 black hole
In this video Katie Bouman mentions that an earth sized telescope needs to be used for getting images like the M87 Black Hole:
Stellar distances are estimated using ...
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Map image (x,y) to spherical coordinates [closed]
What is an efficient method to map image pixels (2D-Cartesian) to their spherical coordinates given camera azimuth and elevation?
(Ideally, response includes mathematical notation/Python/C++)
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Why not a "live" visual connection with Curiosity on Mars all the time?
Note: Got the idea for this question by @uhoh's question: "Has anything close to video ("live" or otherwise) been shot in space from beyond the Moon ?
To have the "feeling" of a "live" connection ...
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How was the landing site decided to land InSight?
From this article
The High-Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter plays an important role in evaluating candidate landing sites on Mars. HiRISE ...
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Why meteorological images have missing lines in the center?
I noticed strange blank line in the middle of completely valid images from VIIRS.
.
This looks like an error in the reception. Would have go unnoticed, unless the same blank line in the middle of ...
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How to develop a photographic film in lunar orbit?
The Lunar Orbiter program was very successful in mapping the surface of the Moon. Images were taken on a 70 mm film, developed in a semidry process, and then scanned by a photomultiplier for ...
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Spectral bands on an Earth-observing satellite
What does it mean when a satellite has these bands[1]:
Panchromatic: 450-800 nm
8 Multispectral (red, red edge, coastal, blue, green, yellow, near-IR1 and near-IR2): 400 nm-1,040 nm
8 SWIR: 1,195 nm-...
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What is synthetic tracking, and why would a 35 cm Earth imager be 10-30x better than Pan-STARRS or LSST for interstellar asteroid discovery?
The ArXiv preprint Technical Note: Asteroid Detection Demonstration from SkySat-3 B612 Data using Synthetic Tracking is an interesting read! The abstract says:
We report results from analyzing the ...
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Technology to directly observe an exoplanets [closed]
I would like to know what number of space telescopes, ideally mass produced ones using current technology and that could be cheaply manufactured and launched en-mass via the future SpaceX BFR. How ...
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Why are so many Lunar Reconnaissance Orbiter images blank?
When downloading Lunar Reconnaissance Orbiter LRO NAC images from the website https://pilot.wr.usgs.gov/ a significant portion of them have no useful data -- they have a sort of plaid pattern. Does ...
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What is the line in this picture?
I'm curious about this picture taken from Osiris-Rex. There is a faint vertical line nearly the width of Earth going from the top to the bottom of the image. What is it? Does it have something to do ...
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Are there ANY verified satellite images of visible light coherent backscattering from Earth?
Coherent backscattering is an optical phenomenon which is a bit complicated and as far as I know is pretty difficult to demonstrate in visible white light images. Image below from here.
According to ...
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Blue region in satellite image
In one BBC article called "Etna escape: 'Pelted with the deadly, hot debris'", there was an image with the following description:
Europe's Sentinel-2a satellite pictured Thursday's lava flow from ...
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Is it possible to see animals from space?
Will satellite imagery be able to see the backs of big animals such as lions, tigers, elephants, horses or zebras from space when they venture out in the open? I've not been able to find satellite ...
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What are these echo-like artifacts in some SDO images?
I was looking at the Galleries in the NASA Scientific Visualization Studio and in the banner they show an image from SDO - the Solar Dynamics Observatory. I've posted it below along with a cropped, ...
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