What is Image: Definition and 1000 Discussions

IMAGE (Imager for Magnetopause-to-Aurora Global Exploration) is a NASA Medium Explorers mission that studied the global response of the Earth's magnetosphere to changes in the solar wind. It was believed lost but as of August 2018 might be recoverable. It was launched March 25, 2000 by a Delta II rocket from Vandenberg AFB on a two-year mission. Almost six years later, it unexpectedly ceased operations in December 2005 during its extended mission and was declared lost. The spacecraft was part of NASA's Sun-Earth Connections Program, and during its run had over 400 research articles published in peer-reviewed journals using its data. It had special cameras that provided various breakthroughs in understanding the dynamics of plasma around the Earth. The Principal Investigator was Jim Burch of the Southwest Research Institute.
In January 2018, an amateur satellite tracker found it to be transmitting some signals back to Earth. NASA made attempts to communicate with the spacecraft and determine its payload status, but has had to track down and adapt old hardware and software to the current systems. On February 25, contact with IMAGE was again lost only to be reestablished on March 4, 2018. The signal disappeared once again on August 5, 2018. Recovery efforts are underway and if successful NASA may decide to fund a restarted mission.

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  1. J

    Diffraction plane & image plane

    Hi Please can someone explain in a simple way what the Diffraction plane & image plane are Thanks
  2. L

    Why do we specify chart image is open?

    Hi, When we define a manifold, and in particular define what a chart is, one of the conditions we specify is that the image \phi(U) is open in R^n. Why do we specify this? For example if we didn't specify this and allowed closed balls, then we could cover S^1 by \theta where \theta...
  3. T

    What is the Image of a Plane Under a Linear Transformation?

    Homework Statement Let T: \mathbb{R}^3 \to \mathbb{R}^3 be the linear map represented by the matrix \begin{pmatrix} 4 & -1 & 0 \\ 6& 3 & -2\\ 12& 6 & -4\end{pmatrix} What is the image under T of the plane 2x - 5y + 2z = -5? Homework Equations None The Attempt at a Solution I...
  4. D

    Is the Normal Spherical Image of a Curve Always Non-Constant?

    Helo..i have a problem about geometry.. How to show that the normal spherical image of x is never constant?
  5. L

    Basis of Image of Linear Transformation

    Homework Statement Given a linear transformation F: R^3 --> R, F(x,y,z) = 3x-2y+z, find I am (F) and dim (Im (F)) Homework Equations I have found that dim(ker F) = 2 and from the theorem dim (V) = dim (Ker F) + dim (Im F), I know dim (V) = 3, so dim (Im F) = 1. The Attempt at...
  6. F

    What are the key image properties of an image?

    What are the "key image properties" of an image? Homework Statement Hi, I'm been assigned a project to capture images of laser speckle and do some image processing in Matlab. The directions say to "measure key image properties". Homework Equations The Attempt at a...
  7. R

    Method of Image Charges - Range of validity of solutions

    When using the method of image charges to solve a problem in electrostatics, how do we determine the volume of space in which our solution is valid? And how do we find the solution outside this volume? To be more specific, let's consider two examples. The first is the classic point charge above...
  8. P

    What is a Direct image and Inverse Image in Real Analysis?

    Homework Statement I am trying to understand the definition of Direct and Inverse Images in Real Analysis I from my book, see attachment please.
  9. B

    Proving the Image Charge in a Metal-Sphere-Shell

    Homework Statement You have charge inside metal-sphere-shell held at V = 0, and you know an image-charge goes outside the metal-sphere-shell to formulate the equivalent and unique potential. Oh, and the metal-sphere-shell is of radius "a". You get to the point where you superimpose the image...
  10. E

    MATLAB How can I find the maximum dimension of a rotated image in MATLAB?

    Hi, I am working on a MATLAB assignment and I stuck in rotating image, I got a code that allocates starting and ending points in matrix I got, works with no difficulties. (which means this code allows me to ignore the white(255) points and get he actual size of image, that is a rectangle or...
  11. P

    Determine Direct and Inverse Image f(E) and f^-1 (G)

    Homework Statement Let f(x):=1/x^2, x not equal 0, x belongs R a) Determine the direct image f(E) where E:= (x belongs R : 1<=x<=2) b) Determine the inverse image f^(-1)(G) where G:= (x belongs R : 1<=x<=4) Homework Equations The Attempt at a Solution A) Let f: R -> R be...
  12. T

    Understanding Lens Separation for Creating an Image at Infinity

    Homework Statement The lenses are separated by 250mm. Where should the object be places so that the final image is formed at infinity? I'm confused.
  13. R

    How Is the Image Size Calculated in a Concave Mirror?

    Homework Statement An object 23.0 mm high is 31.0 cm away from a concave spherical mirror with a radius of curvature of 54.0 cm. What is the absolute size of the image? Homework Equations Maybe these are relevant Mirror equation in terms of focal length...
  14. E

    Medical B-mode Ultrasound Image - what does it represent?

    Dear All, In medical imaging, the pixel intensity of a MR image may represent T1 relaxation time, T2 relaxation time, or proton density. These are intrinsic properties of tissues. For a B-mode ultrasound image, what does the pixel intensity represent? Do they represent the magnitude of...
  15. F

    Getting the image of integration

    How can i get the image of a integral. Say i have a integral function like this \int_{\pi/2}^{\pi} \int_{0}^{2} r\sqrt{4-r^2} drd\theta Now i want to see what volume the integral giving me. Which software i have to use for this purpose. Thanks
  16. E

    PHP PHP programming, image processing

    Hello! So this is minimally image processing, but I didn't know what else to name this thread. I'm working on a project and basically, I have this image (see attached file) that's provided to me. That's all I have to work with. The first column of colored pads represents my test pad...
  17. S

    Estimating image distance in lens and mirror

    I'm having difficulty understanding how to estimate the location of an image in a lens/mirror. I tried understanding it by going off the books question/answer section: "A spherical concave lens has a focal length of 16 cm, and an object is placed 8 cm from the lens." It says the answer is...
  18. M

    Why does our brain invert the image received from our eyes?

    There's really no such thing as "upside down" in an absolute sense, only relative to what we're used to. Why then does our brain invert the image? What's wrong with leaving it the way it is?
  19. Spinnor

    Image vs. sound quality in videos and audio lectures?

    I have been going through some great science lectures I have downloaded from itunes U from Apples itunes store. You don't have to own an ipod to use them as they can be viewed for free on a computer. Unfortunately the sound quality on many audio and video lectures is very poor. We can take...
  20. A

    ISIS image subtraction program; trouble running

    Hi, I'm a bit new to the forums, this is my first post in fact, but I didn't know where else to go for help on this kind of matter. I'm not sure if anyone here has used ISIS image subtraction program written by Alard, available online at http://www2.iap.fr/users/alard/package.html, but I'm...
  21. Z

    Name the crystal spinel from the image.

    Hello, I appreciate your help in naming the structure of the molecular structure which image is attached. The answer should include the molecular formula and crystal structure characteristics. Considering the distribution of atoms within the cell and that the caption below states the atomic...
  22. K

    Suggestion needed: chips can handle simple image processing

    Hi, I am a student whos trying to achieve some camera tracking and speed control of a trolley. and I am kinda lost, don't know where to start with, hence urgently need experts advice.(supervisor couldn't help much) Could someone please suggests me where to look at or any product that's...
  23. T

    How Does the Kernel Equaling the Image Explain A Squared Equaling Zero?

    Homework Statement i) Find the Image and Kernel of A = (2,1)(-4,-2) (where each bracket is a row). ii) Calculate A2 and use i) to explain your result. Homework Equations None The Attempt at a Solution So I can do everything up to the very last bit (i think anyway). i) The Kernel =...
  24. C

    Generate new image from principal components of many images

    1. Homework Statement I'm having a bit of difficulty with a neuroscience course - it's about the primary visual cortex. I have a bunch of image patches (16*16) and I need to generate synthesised images using principal component analysis as a generative model. I reshaped the images to...
  25. N

    Position of image of an immersed object

    Position of image of an immersed object.. Are books wrong? Homework Statement In almost every book I checked, the image of an immersed object is always vertically above the object. Is this always the case and is independent on the position you are looking from? Homework Equations n...
  26. W

    Identity map and Inverse Image

    Hello everyone, I would like to ask what's the purpose of identity map? Recently I came across something that apparently use this to find the inverse image of a function F(x) in the form of F(x) = ( f(x) , x ) . Thanks. Wayne
  27. F

    Image and nullspace bases of a linear transformation

    Homework Statement Let T be the linear transformation T: M2x2-->M2x2 given by T([a,b;c,d]) = [a,b;c,d][0,0;1,1] = [b,b;d,d] Find bases (consisting of 2x2 matrices) for the image of T and the nullspace of T. Homework Equations Standard basis of a 2x2 matrix...
  28. F

    Optimization of C code: smoothing an image.

    Homework Statement I need to optimize this given code: /* A struct used to compute averaged pixel value */ typedef struct { int red; int green; int blue; int num; } pixel_sum; /* Compute min and max of two integers, respectively */ static int min(int a, int b) { return (a < b ...
  29. E

    Mesh generation from an ultrasound image

    Does anyone have a clue on how to obtain the mesh from the ultrasound image? The region of scatterer is automatically more densely meshed than its ambient. Any software? algorithm? Thx. Elgen
  30. T

    Finding the image and completing multiplication tables for G/N and Im(G)

    Homework Statement Consider this group of six matrices: Let G = {I, A, B, C, D, K}, Matrix Multiplication> I =\begin{bmatrix}1 & 0\\0 & 1\end{bmatrix} A =\begin{bmatrix}0 & 1\\1 & 0\end{bmatrix} B =\begin{bmatrix}0 & 1\\-1 & -1\end{bmatrix} C =\begin{bmatrix}-1 & -1\\0 &...
  31. T

    Linear Algebra Problem - Distance from the Image of a Matrix to a Vector

    Homework Statement A problem on a linear algebra assignment is really confusing me. The problem is asking me to compute the distance from a vector to the image of a matrix (with orthogonal columns). matrix A = 1 -2 4 6 2 -11 y= 3 -5 2 Homework Equations dist(f,g) = norm(...
  32. B

    Refracting Surface Image Location

    Homework Statement One end of a long glass rod (n = 1.60) has the shape of a convex surface of radius 12.0 cm. An object is positioned in air along the axis of the rod in front of the convex surface. Find the image position that corresponds to each of the following object positions: 8.00cm...
  33. E

    What happens to an astronaut who enters the event horizon of a black hole?

    Sorry for what may be very basic and unscientific questions, I'm a brand new poster! Regarding black holes: It is my understanding (please correct me if I am wrong) that if an astronaut were to approach and enter the event horizon of the black hole, those watching from the outside would...
  34. S

    Prove inverse image of function

    Homework Statement When f: A -> B and S ⊆ B, we definte If(S) = { x ∈ A: f(s) ∈ S}. Let X and Y be subets of B. a) Determine whether must equal If(X) ∪ If(Y). b) Determine whether If(X ∩ Y) must equal If(X) ∩ If(Y). Homework Equations The definition of an inverse image is stated...
  35. I

    Sunlight falls on a concave mirror, where is the image formed?

    Homework Statement Sunlight falls on a concave mirror and forms an image 3.0 cm from the mirror. If an object 24 mm high is placed 12.0 cm from the mirror, where will its image be formed? a. Use a ray diagram b. Use the lens/ mirror equation c. How high is the image? Homework Equations...
  36. R

    Diverging lens, calculating image location

    Homework Statement Diverging lens with focus of 2 meters. The object is 3.66 meters away from the lens. Find the exact image location. Homework Equations 1/object + 1/image = 1/f The Attempt at a Solution I plugged in the numbers with a negative value for the focal length but I...
  37. D

    Projected image over physical screen?

    Do you think it would be possible for a ipod sized device or small notebook to project an image rather then have an actual screen? So you could carry it in your pocket & when turned on the desplay could be massive like 50inches. Something holographic or what youd expect in the movies...
  38. S

    Observing the image of the sun (optic)

    Homework Statement Hi everyone, I was wondering if anyone can help me out with my project in physics. Our goal is to make the sun image appear on a panel at the end of a rail, using lens, to see if we can observe sunspots on the projected image of the sun. This is the materials we have...
  39. fluidistic

    Describing Image of a Bi-Concave Lens with n=1.5

    Homework Statement A bi-concave lens (n=1.5) has radii of 20 cm and 10cm and a thickness of 5 cm. Describe the image of an object of 2.5 cm of hight and situated at 8 cm from the first side of the lens. Attempt: \frac{1}{f}=(n-1) \left [ \frac{1}{R_1}-\frac{1}{R_2} +...
  40. C

    Forming a Mental Image in Physics: Picture or Movie?

    hey, When people say you should form a mental image when doing physics, does that mean forming a picture(snapshot)in your head or an actual movie of what's happening in your head?
  41. M

    Calculating the Height of a Friend's Image from 4.2m Away

    Homework Statement Your friend is 1.7 m tall. What is the height of her image when she is 4.2 m from you? Homework Equations I used di/do and multiplied that by the height of the friend The Attempt at a Solution I did (4.2/3.5)(1.7) but it was wrong. Not really sure what I'm...
  42. K

    What is the formula for determining image distance in a convex mirror?

    Homework Statement An object is placed 32.7 cm from the reflecting surface of a convex mirror having a focal length of -10.8 cm. Determine the image distance. Homework Equations IDK The Attempt at a Solution Could someone please tell me what equation I should use? Thanks!
  43. K

    Determine image distance and image height

    Homework Statement A) Determine the image distance and image height for a 5-cm tall object placed 10 cm in front of a concave mirror having a focal length of 15 cm. B) Determine the image distance and image height for a 5-cm tall object placed 45 cm in front of a concave mirror having a...
  44. E

    Dielectric Image Charges. Need

    A point charge q is a distance d from a dielectric half-space (z < 0). We will solve for the potential outside of the dielectric, in the region z > 0. (a) Away from the point charge, what equation does V satisfy? Find the boundary conditions at the dielectric surface. (b) Find an image...
  45. G

    Does a Magnifying Glass Create a Real Image?

    I have been given a statement and have to decide if it is true or false and then justify my answer. I have already established that this statement is false by the fact that a magnifying glass creates a 'virtual image' not a 'real' one but i am having trouble working out what else is false...
  46. A

    How Does a Dielectric Half-Space Affect the Potential of a Nearby Point Charge?

    Homework Statement A point charge q is a distance d from a dielectric half-space (z < 0). We will solve for the potential outside of the dielectric, in the region z > 0. (a) Away from the point charge, what equation does V satisfy? Find the bound- ary conditions at the dielectric...
  47. G

    Focal point of image in magnifying glass

    focal point of image in magnifying glass -------------------------------------------------------------------------------- I have been given a statement and have to decide if it is true or false and then justify my answer. I have already established that this statement is false by the fact...
  48. G

    Focal point of image in magnifying glass

    I have been given a statement and have to decide if it is true or false and then justify my answer. I have already established that this statement is false by the fact that a magnifying glass creates a 'virtual image' not a 'real' one but i am having trouble working out what else is false...
  49. M

    How to Calculate Focal Length of a Convex Mirror?

    Homework Statement The virtual image produced by a convex mirror is one-quarter the size of the object. b) What is the focal length of this mirror? Homework Equations 1/di = 1/f - 1/do The Attempt at a Solution i found di to be -9.3 cm but when i solved for f i keep getting it...
  50. Z

    Image of upper half-plane under the inverse sine

    Homework Statement The problem is simply to find the image of the upper half-plane under the inverse sine function. Homework Equations The textbook defines the inverse sine in the following way. First, it defines arccos(w) = -i * log(w +/- sqrt(w^2 - 1)) and then it defines arcsin(w) = pi/2...
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