MSL Humor and Other Stuff, and other non-technical chat |
MSL Humor and Other Stuff, and other non-technical chat |
Sep 5 2014, 11:44 AM
Post
#376
|
|
Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
Moving on...
|
|
|
Sep 21 2014, 07:40 PM
Post
#377
|
|
Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
-------------------- |
|
|
Sep 24 2014, 05:02 AM
Post
#378
|
|
Senior Member Group: Admin Posts: 3108 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
|
|
|
Sep 25 2014, 03:05 AM
Post
#379
|
|
Member Group: Members Posts: 754 Joined: 9-February 07 Member No.: 1700 |
Lately, my eyes aren't as accurate as they used to be: I just read my UMSF bookmark as Unwanted Spaceflight!
|
|
|
Oct 1 2014, 10:10 AM
Post
#380
|
|
Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
Funny bit on the recent Big Bang Theory episode, where Wolowitz as celebrity astronaut throws out the first pitch at a California Angels game using a Mars rover (the crowd was not pleased):
https://www.youtube.com/watch?v=fayK8WGIiyc -------------------- |
|
|
Oct 15 2014, 08:03 PM
Post
#381
|
|
Member Group: Members Posts: 334 Joined: 11-December 12 From: The home of Corby Crater (Corby-England) Member No.: 6783 |
|
|
|
Oct 22 2014, 10:03 AM
Post
#382
|
|
Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
-------------------- |
|
|
Oct 23 2014, 05:34 PM
Post
#383
|
||
Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
VOCA provides real-time, multi-channel, shout-down voice communications between project elements. Includes voice instruments and custom voice net set up. Service is high-availability and includes fault detection and correction. This is a picture of portion of the screen of one of our VOCA stations. Quite apropos for Halloween!
Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
|
|
|
||
Oct 27 2014, 10:35 AM
Post
#384
|
||
Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
I thought it might be fun to run MSL images through face detection software to see if some "faces" emerge out of the random patterns. Turns out the detections aren't really all that facelike, on the order of this from sol 726:
Still, intriguing to think of what similar automated feature detection might produce, using machine learning, etc. -------------------- |
|
|
||
Oct 27 2014, 11:52 AM
Post
#385
|
|
Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
You find, what you are looking for, provided the threshold is low enough. That's the same for humans as for machines, automated pareidolia, if you like. That's why "discoveries" usually need a 5-sigma confidence level, meaning "definitive evidence" to be generally accepted as a discovery. But even then, these discoveries can be false positives in rare cases.
|
|
|
Oct 27 2014, 12:39 PM
Post
#386
|
|
Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
In general, I'd say that an algorithm that finds what one is looking for is a successful algorithm! Of course, if one is looking for faces (or hippos) on Mars, any positives will necessarily be false, but if the algorithm is designed to detect something that's actually there, say spherules, or meteorites, or Jake Matijevic-type rocks, then ideally the true positives will outnumber the false, with the task of sorting through everything manually reduced accordingly.
-------------------- |
|
|
Oct 27 2014, 01:36 PM
Post
#387
|
|
Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
The success depends on appropriate a-priori knowledge. If you know, that there is exactly one "face" in the image, an appropriate maximum-likelihood method - which I presume is implemented by the camera software - can find this "face". Hence the search result should be stated in terms of a conditional probability, taking the a-priori knowledge as the condition, i.e. the probability determined by the automated search needs to be multiplied by the probability, that the a-priori assumptions are correct.
This kind of methods worked in a very simplified way e.g. to find stars in the night shots, using the a-priori knowledge, that there are stars, and that they move apparently in a known direction. But you can also false-positively detect stars that way, if there are none. In the PDS there are loads of processed images, the criteria of which I'm not always aware. But it looks a bit, as if they would try this on a still rudimentary level for the PDS. More advanced methods have been applied to determine grain size distributions. There are loads of applications on Earth. That's a large field of research. Discussing this seriously is rather technical stuff; a better-suited thread for details would probably be in the context of general image processing, or in a separate thread about data reduction and semantics analysis from images. |
|
|
Oct 27 2014, 08:36 PM
Post
#388
|
|
Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
Well, I did post it in another thread, but a mod moved it here, seeing only humor in it evidently!
As for a priori knowledge, I reminded of a story about Vince Lombardi giving his failing Green Bay Packers a lecture on the basics. He started out with "this is a football." -------------------- |
|
|
Oct 28 2014, 11:48 AM
Post
#389
|
|
Solar System Cartographer Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 |
Seems to me that testing face detection software on images which certainly do not contain faces makes for a good test of the software. If it detects faces in a Mastcam image of an outcrop on Mars - or a radar image of Titan, or a photo of Mt Everest - then it's not doing a very good job. It's an interesting idea to explore the outer limits of what the software will detect as a face, and maybe tweak settings accordingly.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
|
|
Oct 28 2014, 06:51 PM
Post
#390
|
|
Senior Member Group: Members Posts: 2173 Joined: 28-December 04 From: Florida, USA Member No.: 132 |
|
|
|
Lo-Fi Version | Time is now: 26th April 2024 - 03:08 PM |
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |