What is Pictures: Definition and 172 Discussions

An image (from Latin: imago) is an artifact that depicts visual perception, such as a photograph or other two-dimensional picture, that resembles a subject—usually a physical object—and thus provides a depiction of it. In the context of signal processing, an image is a distributed amplitude of color(s). A pictorial script is a writing system that employs images as symbols for various semantic entities, rather than the abstract signs used by alphabets.

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  1. G

    An optics question concerning pictures taken by camera

    Answer from the book: We need to draw two diagrams, one assuming the photo on p. 644 is right side up, and another assuming it is upside down. Figure 23–9 is drawn assuming the photo is upside down. In this case, the Sun blocked by the tree would be the direct view, and the full view of the Sun...
  2. BillTre

    Cool Geology Pics - Share Yours Here!

    Here is one I found on Twitter: Please add others!
  3. AlexanderReed

    Where to find detailed control panel pictures of nuclear plants?

    Hello, I would like to know where I can find detailed control panels pictures of nuclear plants. Not necessarily the complete control room but the main panels. I need to be able to read switches, alarms lights, etc... Have a nice day! Thanks
  4. G

    B Question about deep space pictures

    So I have a random question with all these talks of the pictures released from NASA by JWST. So these galaxies, stars, etc, are like 40 million light years away, so that light must've left these galaxies 40 million years ago, which means things have obviously changed. So are there any tests or...
  5. merlyn

    B A friend of mine sent me these pictures showing multiple shadows

    A friend of mine send me these pictures showing three shadows during the day. The time of day was approx 11:45 and it was overcast. He asked me what was causing this effect. Basically you see three shadows. My hypothesis is that the overcast is diffusing the light causing scattering and the...
  6. docnet

    Pictures of your personal libraries or bookshelves

    I love seeing other people's libraries (or bookshelves) because they give me inspiration to plan my dream library, and books ware what make a home feel like home. Here is my very humble "library" in my college dorm room. Please, share pictures of your personal libraries or other libraries that...
  7. DennisN

    Collection of Science Fiction jokes

    I recently saw some very funny memes about Star Wars (which I'll post below), so I thought about starting a thread about jokes about science fiction, e.g. SF movies. Please share funny jokes, pictures and memes about SF and their stories in this thread. And, yes, I know, I'm such a huge SF...
  8. F

    Electrical PIR sensor lags in taking pictures

    Hello, I am using a Raspberry Pi with a PIR motion sensor and a Pi Camera. The idea is that the camera should take a picture every time the PIR sensor detects motion. The system works but it does not respond, i.e. take a picture, as fast as I would like if I wave my hand in front of the PIR...
  9. AndreasC

    I Pros and cons of Heisenberg and Schrodinger (and Feynman) pictures?

    So there's this professor who insists that the Heisenberg picture is all the rage and much superior in most ways to the Schrodinger picture. He compares it to how you don't use the Hamilton-Jacobi formulation of classical mechanics as much as the Hamiltonian one. Alright, I can buy it. I...
  10. Z

    I Why are pictures of galaxies so clear?

    When a photo of a nearly edge on galaxy, say Andromeda, is taken. Why are the stars on the far side of the galaxy so clear? The light from those stars took an additional 220,000 years to reach us. Those stars have moved quite a lot from their positions since the light from the foreground stars...
  11. S

    B Why do pictures of stars have 4 cardinal points?

    I've noticed that a lot of these pictures are like this. Is it something to do with the error in the machining of the lenses?
  12. R

    Can you identify these scientists?

    Hi, can you guys identify the people in this photo? I am specifically interested in the person in the front-middle with his left hand in the pocket. This is from Leo Szilard's Wiki page: https://en.wikipedia.org/wiki/Leo_Szilard
  13. Geofleur

    A Heisenberg/Schrodinger pictures versus passive/active

    In my readings lately, I have come across the assertion that the Heisenberg picture corresponds to passive transformations while the Schrodinger picture corresponds to active transformations; however, such seems not to be the case. I want to know whether my thinking is correct or if I'm confused...
  14. BillTre

    Award Winning Pictures of Algae

    Six nice pix of kinds of algae you don't usually see http://www.brphycsoc.org/Canter_Lund_2018/index.lasso.
  15. C

    Explore and Discover Microscopy for Kids with STEM Ambassador

    Hi. I'm a retired several-sciences guy, a STEM Ambassador encouraging kids to look at science, hopefully fostering interest. I'm also interested in microscopy. I/we are looking for ideas for small items which demonstrate interesting/educational things, for kids to look at through microscopes...
  16. R

    Stargazing What was the reaction to the Hubble telescope's pictures?

    I was just wondering what the reaction was from people and the media at the time after hubble's telescope took it's famous images? If I am not mistaken hubble's images where one of a kind showing that there where a lot of galaxies and whatnot out there. Was it advertised on the news a long...
  17. I like Serena

    MHB MHB Introduces: Creating TikZ Pictures

    Hi everyone! ;) We are very excited to announce the introduction of TikZ pictures. MHB is the very first math site ever to allow members to post TikZ pictures! (Emo) To add for instance a plot, we can now use: \begin{tikzpicture} %preamble \usepackage{pgfplots} \begin{axis} \addplot...
  18. wolram

    Pictures of extraterrestrial space

    Do any of you have pictures of space objects, planets, moons, galaxies that have not been enhanced?
  19. M

    Is it Possible to Capture a Complete Image of Earth from Space?

    I've been messing around with some circle theorems and found that you couldn't possibly take a picture of a full Earth from a single shot. Is this impossible? Is their some math to prove otherwise, I'm really stuck.
  20. S

    What's the difference between series an parallel components in the pictures

    hi; When I study - if we want to connect impedance in the case of: - we connect the R4 and (R1+(R2||R3)) as parallels but when we want the get impedance of C and R of the right: - we connect that as series: Z(of C)+R .. why the different? please help!
  21. M

    LaTeX Two tikZ pictures side by side

    Hi PF! I have been trying to put two tikZ pictures next to each other but I can't figure out how to do it. I've used the \begin{minipage} command, which worked well, but was unable to generate a caption. Any ideas?
  22. A

    Drawing Graphs from Pictures: A Step-by-Step Guide

    How to draw the graph from the picture. I solved 50% my self like grade Xcut-off point but I do not understand the graph below
  23. M

    Expectation of position and momentum at time t, pictures

    Homework Statement Consider a particle, with mass m, charge q, moving in a uniform e-field with magnitude E and direction X_1. The Hamiltonian is (where X, P, and X_1 are operators): The initial expectation of position and momentum are <X(0)> = 0 and <P(0)>=0 Calculate the expectation...
  24. L

    Troubleshooting a Grey Spot in Camera Pictures

    Here's a picture of the grey spot that's in my pictures. I can see it on the screen on the back of the camera when I'm taking the picture. I cleaned the lens, and it's definitely not on the outside. If it's something on the inside, how would I fix that? My camera has just been sitting on my...
  25. L

    Pictures of Magnetic Field Lines

    I have looked in vain on the web for pictures of magnetic field lines for multiple linked current loops. I would be happy just to see a picture of the field lines for a simple Hopf link but somewhere there must be pictures for the Borromean rings and other more complex links - and also braids...
  26. jim mcnamara

    NASA pictures of dark matter collisions

    http://www.nasa.gov/press/2015/march/nasa-s-hubble-chandra-find-clues-that-may-help-identify-dark-matter/index.html The take away seems to be that some ideas about dark matter may have problems. The possibilities checklist of dark matter interactions has been shortened. There are some really...
  27. DaveC426913

    Artists? Matting pictures - tape

    Are there any artists / pro photographers here? I am putting some photos in a show next month. I've cut all the mattes, and printed the pictures. I have yet to put the mattes on the pix. Normally, when I matte a piece of art, I only need to apply a small amount of tape, like a square inch or...
  28. HiggsBoson1

    Great physics jokes (pictures)

    These are some of the best physics jokes on the internet. Enjoy!
  29. A

    Software to draw graphs and other pictures?

    Hello, I would like to know which sotfware physicists (or other scientists) use to make nice pictures for presentations to students, scientists or general public. I would like to make good presentations without spending a day for drawing a simple image. For example if I want to explain Riemann...
  30. H

    What Is the Most Embarrassing Throwback Picture of You from High School?

    http://www.city-data.com/forum/attachments/photography/140267d1417205484t-your-most-embarrassing-picture-10810_753068871396816_1602066844002722849_n.jpg me from when i was started high school 10 years ago
  31. Borek

    NASA NASA - water on Mars, sediment pictures

    http://www.nasa.gov/jpl/msl/pia19074/#.VIXlXTHF98Ehttp://www.nasa.gov/press/2014/december/nasa-s-curiosity-rover-finds-clues-to-how-water-helped-shape-martian-landscape/index.html#.VIXk_zHF98G That's just perfect! (can we repost the image here? I have no time to browse the site looking for the...
  32. R

    Those Pictures (Representations) in QM and the density equations

    Hi there: I am reading a book (Atom-Photon interaction by Claude Cohen-Tannoudji, Page 448) and the following things gave a big headache. (1) Is there a density equation in Schrodinger Picture. because I encounter one, like: ##i \hbar \frac{d \sigma}{dt}=[\hat{H}, \sigma]## and...
  33. atyy

    Many-worlds, Schroedinger, Heisenberg pictures

    I've usually heard the many-worlds interpretation described in the Schroedinger picture, in which the wave function evolves unitarily. Does a Heisenberg picture exist for many-worlds, or is the Schroedinger picture more fundamental in that interpretation?
  34. tridianprime

    Solid Helium: Why No Images? | Feynman Lectures Vol.1

    I was not sure exactly where to put this but it involves images so I thought it was no too inappropriate here. I was reading the Feynman Lectures Vol.1 and he says that Helium, although not solid at absolute zero normally, can be so in high pressures. I then googled this for images but none...
  35. ignacio_cabero

    How can I add pictures to my python game using JGrasp and PyGame?

    Hello. I am creating a text-based video game using python, and I was wondering how I could put pictures from my Mac into the game. I am using JGrasp if it helps to know.
  36. L

    What are these rocks worths? Pictures inside.

    I know a gentleman who wants to clear up his collection. 90% of these are handpicked, including the 150 lb amethyst in the last picture in post #3. Is there a market for this?
  37. U

    Can Ghostly Images Be Captured Through Time in Photographs?

    My girlfriend and I at the time took some photos at a know haunted spot back in 2008. Two pictures developed where you could see two obvious distinct ghost images in a rear view mirror and a backseat window. These photos were definitely not manipulated in any form. As years went it on and I...
  38. H

    The problem between two pictures that show the same(?) Zeeman effect

    Hello. I am confused with my teacher argument with the two pictures that shows the Zeeman effect. The addresses to them is http://www7b.biglobe.ne.jp/~kcy05t/paschen.html (the first pictures) http://psi.phys.wits.ac.za/teaching/Connell/phys284/2005/lecture-03/lecture_03/node14.html My...
  39. S

    Updated Ferrofluid Cell Pictures

    Hi Y'all, My name is Michael Snyder and I'm a PhD student at the University of Louisville. You may have seen my work on the 2012 APS calendar. A few years ago I posted some ferrofluid cell physics images in this forum. The cell is made of two pieces of glass and some ferrofluid...
  40. N

    Stargazing Pictures from the Hubble Space Telescope

    78 Pictures from the Hubble Space Telescope http://www.space.com/15235-hubble-space-telescope-latest-photos.html
  41. S

    Programs Which degree to finish (see pictures)

    So here are two graphs of my current status on the department, one is for Computer engineering and the other for Computer Science, on both of them i need 27 credits but not sure which one to take.. CE: http://i.imgur.com/W36wukS.png CS: http://i.imgur.com/wiRs8Vd.png The yellow are the curses...
  42. C

    Can We See Atoms and Molecules? Exploring the Latest Real Images

    Can someone post the most precise atom or molecule real pictures at present?
  43. T

    All screen pictures variations

    I don't know if there was talking about this or somebody already did this but do you think it would be possible to make software that shows you all possible pictures variations on your monitor/TV? What I mean is monitor works on RGB principles and is separated into tiny squares that gives RGB...
  44. J

    Time Dependence in Pictures of QM

    I have a question about time dependence in the different pictures of QM. In the Schrodinger Picture, I've read that the time dependence is in the state vector, but one can construct Hamiltonians and other operators that are time dependent in the Schrodinger Picture. For instance, one can...
  45. S

    Funny Pictures Found On the Net

    Just a thread to post funny pictures you found on the net. I searched but didn't find a thread for this. Hopefully I'm not wrong.
  46. B

    Who is the artist who drew pictures on the backs of the checks he wrote?

    When I was English class in either the 7th or 8th grade, my English teacher told the class that there was a famous artist who drew pictures on the backs of his checks. The famous artist drew pictures on the backs of his checks because he thought (correctly, according to my teacher) that people...
  47. B

    Probability of matching n words with n pictures correctly

    Suppose there are n pictures and n words. Each word matches with exactly one out of the n pictures. What is the probability function of having exactly y words match up correctly?
  48. ME_student

    What are your hobbies? (Include pictures please)

    So here are a few things I do when I am not working or doing homework. Eat Kimchi stew:smile: Work on the truck. And wheeling with my buddies.
  49. R

    Stargazing What creates the star points in telescope pictures of stars?

    what creates the "star points" in telescope pictures of stars? it's a basic question. e.g. see this hi-rez Hubble Deep Space pic: http://upload.wikimedia.org/wikipedia/commons/9/9b/Hs-2004-07-a-full_jpgNR.jpg i count about three bright objects with pointy cross-like projections from...
  50. D

    Find Large Pictures to Fit A0 Paper at 300 DPI

    I'm looking for large pictures. I want to print a wallpaper on a A0-paper (on a plotter) with the normal 300 DPI. I've used google to search for wallpapers 'greater than' but I end up with pictures that won't fit A0 with 300 DPI (they're in fact smaller). I'm thus looking for a website for...