Images Definition and 388 Threads

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. S

    A A decreasing sequence of images of an endomorphisme

    Let ##M## be a left R-module and ##f:M \to M## an R-endomorphism. Consider this infinite descending sequence of submodules of ##M## ##M \supseteq f(M) \supseteq f^2(M) \supseteq f^3(M) \supseteq \cdots (1)## Can anybody show that the sequence (1) is strictly descending if ##f## is injective...
  2. 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...
  3. J

    How to Use the Method of Images for a Line Source on a Semi-Circular Boundary?

    Homework Statement Consider the curve C (image attached). C coincides with the real-z axis for $$|z| > a$$ and, in $$|z| < a$$ C coincides with the semi-circle $$|z| = a, =z > 0$$ In terms of simple singular flows, what is the image in C of a line source of strength 2πm lying at z = z_0, above...
  4. Hydrous Caperilla

    Number of Images Formed from Reflection & Refraction

    Homework Statement [/B] A glass slab of refractive index n=2 has left spherical of radius 10cm and right surface plane.From both surfaces refraction as well as reflection takes place.A point of object P is placed at a distance 15cm from point O1. Mark the correct option (A)two images are...
  5. Greg Bernhardt

    B HiRISE images show strange-looking Mars formations

    Who's got some ideas? https://www.nasa.gov/image-feature/jpl/pia22348/formations-in-context-or-what-is-it
  6. P

    Where can I find water vapor images?

    I am searching for images of the daytime sky taken within the water vapor absorption bands at 940nm, 1600 nm, 1860 nm, 2700 nm or 2900 nm. Specifically I am trying to see if multispectral images of in-band and adjacent out-of-band photos could be subtracted to show areas of slight water vapor...
  7. P

    I Minimizing diffraction in images using a photodetector

    If I understand the phenomenon correctly; whenever we capture an image using a telescope, because the light that's emitted from a distance object acts like a wave, we notice a diffraction pattern in our image. Now, in the double slit experiment (I didn't create the image, excuse the "slot"...
  8. Spitfire

    I Wonderful new images of the center of our galaxy

    https://phys.org/news/2018-02-high-resolution-image-core-milky-reveals.html This is my first thread here so if I have done something wrong or placed it in the wrong place, I apologies in advance. Otherwise enjoy! I found the images amazing to say the least.
  9. curiousman

    Understanding Ultrasonography: Exploring Dynamic Changes in the Body

    Hi team of experts, Firstly, I'm not a physicist so apologies for the high level of ignorance. How do ultrosonographic images work? Let's assume I want to observe dynamic changes within a specific area of the body. What type of dynamic changes are detected on those images? Thanks, Jose
  10. amjad-sh

    Method of images, charge q inside conducting sphere

    Homework Statement Using the method of images discuss the problem of a point charge q inside a hollow grounded conducting sphere of inner radius a.Find (a) the potential inside the sphere (b) induced surface-charge density (c) the magnitude and the direction of force acting on q is there any...
  11. E

    Method of Images two parallel pipes at potentials of 0 & +V

    Consider the scenario where there are two parallel conducting pipes of radius R separated by a distance d, with pipe 1 at a potential of -V and pipe 2 at a potential +V. I have seen from many sources that there is a very easy method of images solution to the potential outside the pipes, given...
  12. P

    Falling object, time between images

    Homework Statement Estimate the time between each photoflash of the apple in Fig. 2-18 (or number of photoflashes per second). Assume the apple is about 10 cm in diameter. [Hint: Use two apple positions, but not the unclear ones at the top.] Homework Equations All we have learned in class is...
  13. Avatrin

    Python Working with PNG images in Python

    Hi I have to run a few algorithms using Python on PNG-images. However, I also know that PNG is compressed... How do I do this? I need to learn the following: 1: Extracting the RGB information about the pixels. 2: Isolating parts of the image (for example, importing an image and only working on...
  14. T

    How Does the Method of Images Simplify Electrostatic Problems?

    Homework Statement the calculation can be considerably simplified by using the so called method of images. In this method, the electric field and potential produced by the induced charge distributed on the sphere can be represented as an electric field and potential of a single point charge...
  15. FallenApple

    What is the concept of geodesics between images in computer vision AI?

    I was told by someone that for computer vision AI, a photo of say an apple and an orange exists on some high dimensional manifold, and the goal is to learn a geodesic between the two objects. What does this mean? Does this mean that the photo of one of the images is just a tuple of coordinates...
  16. U

    Do Concave Mirrors Always Form Real Images?

    i want to know the concave mirros is always real images or any difference then how to calculate thanks and regards Uday
  17. J

    Optics : How many images can be seen in inclined mirrors?

    Homework Statement Homework EquationsThe Attempt at a Solution [/B] I tried to draw a rough figure depicting the situation. Here M is the mosquito and I1, I2, I3 are its images . Mosquito can clearly see it's image I1 .Now whether it can see I2and I3 is something I am not too sure ...
  18. Fernando

    Two spots with one laser beam in images

    Hello everyone. I have a question about Optics and I place here because I don't know if there are a specific thread. I am using a laser beam to calibrate position of several cameras. But instead of to have one spot in the image I have two spot. One of them is smaller of the other. I presume...
  19. S

    A Stereoscopic Images and Distance Between Objects

    Hello Experts, I leaned that using a sterescopic cameras (generates 2 photos) one can measure the distance to any object in the image produced by the camera. For example, if I take a picture of a lamp post using a stereoscopic method, I can determine the Distance from the camera to the lamp...
  20. UsableThought

    Bug Bug - images are attached even if I just want them displayed

    Normally I use the little "cute sunset image" icon on the rich text editing bar to include photos in a post (it's the icon to the right of the smilie icon and to the left of the film frame icon). And normally, no problem. However, for the post below, I am finding that no matter what I do...
  21. F

    Why Don't Vector Images Distort When Scaled?

    Hello, I am trying to understand how vector images are formed and manage to be scaled up or down without distortion. Bitmap images are easy: they are a grid of pixels and each pixel has a certain color. Scaling a bitmap image of 10x10 pixels implies adding new extra pixels and using...
  22. M

    Python Merging FITS Images with Python & Astropy

    Hello everyone, I would like to know how I can combine two FITS images (which are continuum maps of two sources) in python using astropy. Bests
  23. F

    I Understanding Quantum Corral images

    Hello Forum, The iconic images of quantum corrals are made by assembling individual atoms using a STM. I am still unclear on what the image is truly representing. Do the ripples represent the probability density? Of what? How is that possible? I can see how we can mathematically calculate and...
  24. Z

    Method of images: infinite line of charge above plate

    Homework Statement An infinite line of charge with charge density λ is parallel to and a distance d above an infinite grounded conducting plate. What is the charge density σ that is induced in the plate? For simplicity, consider the line of charge to lie along the line x = 0. Homework...
  25. M

    Linear transformations, images for continuous functions

    Homework Statement Let ##C## be the space of continuous real functions on ##[0,\pi]##. With any function ##f\in C##, associate another function ##g=T(f)## defined by $$g=T(f)\equiv \int_0^\pi \cos(t-\tau) f(\tau) \, d \tau$$ a) Show ##T## is a linear transformation from ##C## to ##C##. b)What...
  26. directbydirecct

    A Deriving Amplification of Images in Schwartzschild Metric

    In the paper Strong field limit of black hole gravitational lensing, the amplification of images in the Schwartzschild metric was given by $$ \frac{1}{\beta}\sqrt{\frac{2\,D_{LS}}{D_{OL}D_{OS}}} $$However the authors did not derive this expression or explain its origin. Does anyone know how to...
  27. Larry Gopnik

    LaTeX Placing greyscale .jpg images into a matrix

    Hi, I hope someone can help me! I could not find a solution online of which could help me. My problem: I have imagecubes - they are a "cube" of 10 images of the same place of a photo, one at 400nm, one at 450nm etc etc. I need to upload these into MATLAB so I can then analyse the intensities...
  28. G

    Can Neurons Truly Explain the Experience of Red and Other Qualia?

    So how do neural patterns give rise to images.. what's the latest on this? My background is Antonio Damasio's and Edelman's.
  29. VMP

    Solving Method of Images Problem for Induced Charge

    Homework Statement We have a coordinate system (x, y, z). Two conducting plates 1 and 2 are parallel and lie in the x-y plane. Plate 1 is at height (x, y, 0) and plate 2 is at height (x, y, 4a), where a is an arbitrary constant. Between these two plates there are 2 charges +q and -q. Charge...
  30. davenn

    Stargazing Deep Space Imaging and stacking images for less noise

    hi guys Today I would like to show the advantages of stacking a set of exposures over just a single shot There are various ways to stack individual exposures. A number of programs are available ranging from free to quite expensive ... several 100 US$ free = DSS - Deep Sky Stacker...
  31. I

    Is it possible to see Newton rings in CT (xray) images?

    I have seen what looks like Newtons rings interference pattern in transverse CT images of 2 solid water block on top of each other. My understanding is that Newtons rings occur in visible light eg photography or scanners. Can anyone shed some light on this? :)
  32. Q

    A STM images of graphene, graphite and Silicon carbide

    most STM images of graphite have been acquired using a bias voltage of ? Or in the range ? Same thing for graphene and Silicon carbide
  33. B

    I Fourier transform sum of two images

    The FT decomposes images into its individual frequency components In its absolute crudest form, would the sum of these two images (R) give the L image?
  34. F

    Method of images about a sphere with a dipole

    Homework Statement Hello everyone, I am new here and have a question regarding method of images in my electricity and magnetism class. I need help to even get the ball rolling. The question is as follows: a) What is the image of a dipole, oriented toward the center of the conducting sphere, if...
  35. M

    Oscillations around CO atoms seen in STM images

    This effect can be seen in the short film "A Boy and His Atom". I had a couple ideas about what this could be but I am curious if someone knows better.
  36. F

    Methods of Images between two parallel cylinder

    Homework Statement Using methods of Images, How do I find the potential of the system consisting of two conducting cylinders that are not grounded and separated at a distance of 2D, one in a potential of V_0 and the other is -V_0? Homework Equations The potential due to an infinite line...
  37. D

    Stimulated Emission: Is this how we see images?

    I got the explanation about stimulated emission and lasers as explained here: Understanding Stimulated Emission: Got the what, how about the why? What I'm still unsure about is if this also explains the simpler question of how light passes through a transparent medium, like glass, yet the...
  38. A

    Calculating Electric Potential with Method of Images

    I'm solving a problem numerically where I have some charge density above an infinite, grounded conducting plane and want to determine the electrical potential at a given point. My intuition says that this is not simply given by the potential of the charge density above the plane, since this will...
  39. R

    Mathlab code to extract T1 values in MR images

    I have T1 MR images DICOM (http://www.osirix-viewer.com/datasets/DATA/BRAINIX.zip ) does anybody know the CODE to calculate T1 values from above DICOM images in MATHLAB?
  40. E

    Using the Fourier Transform on Partitioned Images

    If I cut my image into several portions and use the Fast Fourier Transform on each portioned image, will I achieve the same result as if I used Fast Fourier Transform on the whole image? I have this concern because I need to process a large image using the Fast Fourier Transform, the problem is...
  41. R

    Method of images: electric dipole and infinite plane

    Hello, a dubt arose while doing some exercise. If I have a charge q at a distance d from the above-mentioned plane, i can find the solution to the laplace equations (thanks to the uniqueness theorems) finding a collection of image charges that satisfies the boundary conditions. These conditions...
  42. mishima

    Practice Images for CCD Photometry?

    Hi, it seems astronomical FITS images are abundant on the internet. However, I am looking for FITS images of bias/flat and standard stars along with observations to practice CCD photometry and having a harder time. I would like to be able to take a set of images and obtain the transformation...
  43. D

    MHB Ranking Images using a 5-Star Ratings System (Bayesian Statistics?)

    I run a photo contest that uses a 5-star rating system which ranks the images according to their average rating. However, I would like to factor in the total number of votes a photo receives to get a more accurate ranking. For example, I do not want an image with one 5-star vote (Avg rating: 5)...
  44. askhetan

    Matrix Elements as images of basis vectors

    I'm trying to understand the maths of QM from Shankar's book - Principles of Quantum Mechanics: On page 21 of that book, there is a general derivation that if we have a relation: |v'> = Ω|v> Where Ω is a operator on |v> transfroming it into |v'>, then the matrix entries of the operator can be...
  45. heavystray

    Thick convex mirror or a thin one for the anti-theft mirror?

    the question in my exam goes like this: should we use a thick convex mirror or a thin one for the anti-theft mirror? the given answer: thin, because a thin convex mirror does not form multiple images can someone please explain to me why a thin spherical mirror does not form multiple images...
  46. davidbenari

    A question related to the method of images and uniqueness theorems

    My question is best illustrated by an example from a Griffiths book on E&M: "A point charge q is situated a distance ##a## from the center of a grounded conducting sphere of radius R (##a>R##). Find the potential outside the sphere... With the addition of a second charge you can simulate any...
  47. P

    NASA New Pluto images from NASA's New Horizons

    New Pluto images from NASA's New Horizons New close-up images of Pluto from NASA's New Horizons spacecraft reveal a bewildering variety of surface features that have scientists reeling because of their range and complexity. Continue reading...
  48. Shreyas Shree

    Why does the method of images work?

    Why does the method of images work?
  49. T

    The process of the method of images

    I am really confused that the whole process of the method of image. Suppose I have the + q near the infinite conducting plane which is grounded. My first question is: Is the conducting plane grounded before putting the +q or after putting the +q then grounded? The first question would lead to...
  50. Malaxus

    Question about Holograms and 3D mid air images, videos, etc.

    I am very curious about holograms and if there is a possible way to project 3D , mid-air images and videos on air with no holographic screen (The Princess Leia hologram in Star Wars). If it is not possible, how long till they actually start arriving to the world and how will they work/operate?
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