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. C

    Optics - Reflection of image from a moving mirror

    Optics -- Reflection of image from a moving mirror I have a dufficult question which I couldn't find an answer to, yet: If I am standing in front of a mirror - I can see my image, naturally. Now, let's say that the mirror is actually a very long train and it moves parallel to me . And...
  2. N

    Complex Analysis - Finding the image through a mapping

    Homework Statement The point 1 + i is rotated anticlockwise through \frac{∏}{6} about the origin. Find its image. The Attempt at a Solution The point 1 + i creates an angle of arctan(1/1) = ∏/4 The rotation is by a further angle β = ∏/6. So the new point w in the w-plane from...
  3. G

    Find Open-Source Image Compressor for Ubuntu/Windows 7

    1.Hey friends I Want to Compress the image in order upload them in my website. I have scanned them now what i need to do is to reduce their size. For that i need open source software to compress them. so, will anybody help me for finding it. 2. Next problem is i have made graph using...
  4. A

    Image array processing, need function ideas

    I want to write a code for a MCU, the MCU will output an image to a TFT screen, and here is the tricky part: I want to make the final display to mimic old CRT, which means it will shrink, skew, and out of sync randomly, and the image will be constantly shaking. I hope the FPS would be 60...
  5. G

    How to convert Equation to image

    I want to know how to post equation in website. I want to start site myself but the equation which i have typed in Word 2007 are not professional to update in site so which software i can use so that i can update equation as well as graph in website.
  6. B

    Can Real-Time Focus Stacking Enhance Long-Distance Wildlife Observation?

    Hi folks, its been a while since I've visited. I had an idea a few years ago I never pursued and I thought I'd run it past this group simply because not only is it beyond my education to develop but its combining both optical physics and some techniques used in cosmology. OK so here goes I...
  7. P

    How Do Image Sensors Produce Accurate Colors?

    I'm really curious as to how it's possible for image sensors to capture scenes that look so accurate. The tiny color filters placed over the photosites are dye-based and due to that and their thinness I assume this means that a green filter must let in quite a bit of red and blue light which...
  8. Z

    Open Set Image: Is Constant Function's Image Open?

    Hi the image of an open set by a function continues IS an open set? i think that if we have a constant function , the image of an open set does not have to be open.
  9. Andy Resnick

    Lytro Camera: Understanding Focus After Image Acquisition

    For those who don't know, a company (Lytro) just released a camera that allows for changes in focus *after* the image was acquired. Now that's it's been released as an actual product, I'm intensely curious to understand how it works. Their website has a cutaway image, and the 'lightfield...
  10. S

    Proving image of intersection?

    Homework Statement Let F be a relation from X to Y and let A and B be subsets of X. Then, F(A \cap B) \subseteq F(A) \cap F(B) The Attempt at a Solution Let y \in F(A \cap B). Then, \exists x \in A \cap B, so \exists x \in A and x \in B. Then, y \in F(A) and y \in F(B), so y \in...
  11. N

    Reconstruction of a 3D image from layered 2D images

    I am currently looking at constructing a model of a 3D printed item based on a sequence of images of each layer of the print. At the moment the sequence of images are transformed to black / white and run through a Moore Neighborhood algorithm and then a voxel representation of the printed...
  12. T

    Prove the inverse image is a subspace.

    Let T: V-->W be a surjective linear transformation and let X be a subspace of W. Assume tat Ker(T) and X are finite dimensonal. Prove that T^-1 (X) = {v | T(v) is in X} is a subspace of V. Ok I absolutely suck at showing things are a subspace of something...I don't even know where to...
  13. R

    Topological dimension of the image of a smooth curve in a manifold

    Here is the situation I am concerned with - Consider a smooth curve g:[0,1] \to M where M is a topological manifold (I'd be happy to assume M smooth/finite dimensional if that helps). Let Im(g) be the image of [0,1] under the map g . Give Im(g) the subspace topology induced by...
  14. S

    Linear algebra - Image and Kernel

    Homework Statement Let V be a 3 dim vector space over F and e_1 e_2 and e_3 be those fix basis The question provide us with the linear transformation T\in L(V) such that T(e_1) = e_1 + e_2 - e_3 T(e_2) = e_2 - 3e_3 T(e_3) = -e_1 -3e_2 -2e_3 we are ask to find the matrix of T and the...
  15. madmike159

    C# Converting Bitmap Image to JPEG for Xbox Kinect

    I am getting a 640x480 bitmap image of an Xbox Kinect, and I have also made a separate programs which can send and receive images over TCP. Since bimaps are uncompressed I would like to convert the image to a JPEG to save bandwith. The only examples I have seen of this were for saving images...
  16. F

    Type of image from an afocal optical system

    Hello Forum, what type of image does an afocal system produce if the object is an extended object? A real or virtual image? Any example? Say a car is located 30 meters away... Thanks fisico30
  17. Y

    Electric Field in a Conductor: Is the Image Misleading?

    The image below is from giancoli. There is clearly an electric field inside the conductor, going from the + charge on the outside surface of the wheel to the - charge on the inside surface of the wheel. There is an electric field inside this conductor because if I drop a + test charge in the...
  18. N

    A fast image recognition algorithm for box?

    If you have an image (just black and white) with a box SOMEWHERE in the image, but there's also some noise in the image, is there a good way to find four corners? I'm sure someone has herd of an algorithm for this, it would just be good if I had a direction to go in.
  19. 1

    MATLAB How can I use MatLab for Chroma-Keying and replacing a green background?

    Hi, I have an image (attached) I have to use as a reference. To be clear I have to use this grid as calibration for an acquisition sistem. I want to get the grid of this image and superimpose it on other images. Is it possible? how to do it? Thanks
  20. A

    MATLAB Curl of Gaussian image derivatives matlab

    Hi guys, I am trying to create a magnetic field from an image contour and an attempt to create an active contour model. I have a function which takes the image derivative via a Guassian: function J=ImageDerivatives2D(I,sigma,type) % Gaussian based image derivatives % %...
  21. R

    Unpolarised light, stokes vector and image matrices.

    I was working on a project of image encryption and I got stuck at something. I'll go point-wise. 1. I need to make optical element filters like linear polariser, circular polariser, retardets etc. working in matlab. 2. I decided to use mueller calculus and stokes vectors. So, I would...
  22. T

    Image processing problem (counting is hard )

    Hiya! Long time registrant, have not used these forums is years though... Anyhow, the problem I have is that I need to collect data from a very large number of images that are essentially horizontal lines on a page. I've attached a sample here, which has been processed to find the edges of...
  23. K

    (Image Theory) Boundary conditions and how many image charges do i need?

    Homework Statement An electrostatic point charge of 1 Coulomb (C) placed symmetrically between two infinitely/perfectly conducting parallel plates. These two infinitely large conducting plates are parallel to the yz plane.The region between the two plates is designated as “Region A.” Starting...
  24. K

    Optics - reduce image and launch into optical fiber

    Dear all, I'd like to know if there is a way of reducing an image and launching it into the core of an optical fiber. By other words, I'm not interested in the spatial distribution of the light (the image itself) but I'm interested in gathering all the light coming from the scene and...
  25. M

    Solving Image Processing Problem: Fourier Transform and Image Dimensions

    hi! i need help with problem: Let F(u,v) be the Fourier transform of an M x N image f(x,y). Let g(x,y) be an image of dimensions (2 M) x (2 N) whose Fourier transform G(u,v) is defined as follows: What does the image g(x,y) look like in terms of f(x,y)? my solution ...
  26. A

    Java JAVA how to get rgb values from an image

    hello, i'm kinda new in this programming thingy so i hope you guys can help me. i wanted to code a program that can identify whether a banana is ripe or not. basically, i have two image of banana; one yellow in color and another one is green. so I'm thinking about using AI technique...
  27. F

    Speed of Boy & Image in Plane Mirror: A,B,C Explained

    Q. If a boy is at a distance of 40m from a plane mirror and runs parallel to the plane of the mirror while maintaining the same distance from the mirror what will be the speed of the image and the boy. A. Same B. The boy has greater speed than his image C. The image has greater speed than the...
  28. P

    Solve for Image Height: Find Hi with f, M, s & s

    Homework Statement With a lens with f = 25 cm, we want to project an image that is 5 times bigger than object, so M = 5 - Find the image distance s' - Find the image height Hi Homework Equations 1/f = 1/s + 1/s' M = s'/s = Hi/Ho With: f = focus distance of lens M =...
  29. J

    Image charge inside a conducting sphere

    I think understand the concept of the "method of images" to describe a conductor. The conductor has to be an equipotential or else electrons would be moving around inside it. This equipotential can be described by replacing the conductor with an image charge. For example imagine the field...
  30. A

    Finding the image: a 1/z transformation

    Homework Statement Find the image of the region x > 1, y > 0 under the transformation w = 1/z. The answer is given in the book: (u - 1/2)^2 + v^2 < (1/2)^2, v < 0 Homework Equations A(x^2 + y^2) + Bx + Cy + D = 0 D(u^2 + v^2) + Bu - Cv + A = 0. (u,v) = (x/(x^2 + y^2), v = -y/(x^2 +...
  31. D

    Image Median Filtering (Selection Algorithm)

    Homework Statement I started working on a C++ image median filter for fun... I'm supposed to read a 30x30 16-bit grayscale binary image and apply selection algorithm. 3x3 kernel. Please help output is messed up and i don't know where to start fixing it. Homework Equations using...
  32. S

    Image Formation and Reflection

    I have been having trouble with this for a long time 1st - How and Why is a image formed ? 2nd - If all objects reflect light why is the image not seen on all the objects Even walls reflect light but there is no image formation when light rays from an object reflect off an object and...
  33. G

    Find the image set under a function

    [b]1. f(x) = 1/4 (x - 1)^2 - 9. What is the image set of the function f? Express in interval notation. g(x) = 1/4 (x - 1)^2 - 9. (1 ≤ x ≥ 7). Specify the domain and image set of the inverse function g^-1, and find it's rule. I really don't understand what happens in these questions. I...
  34. K

    The problem described with image in topic

    [PLAIN]http://img842.imageshack.us/img842/336/angleqj.png Lets say that the body has force F in the direction B(β). What is the formula that would let me calculate X velocity and Y velocity of the body? The formula should include all three factors, A(α), B(β), and F (force of the body)...
  35. C

    Concave Lens _ Image Formation

    A concave lens always forms a virtual image (for a real object), will it always form a real image for a virtual object? (that is, when rays converge on it) If yes, why? If no, why?
  36. H

    Real Analysis: Worked Examples and Graphical Representations

    Does anyone know of a good resource for these types of problems? I took an Intro to Real Analysis class as an undergrad and didn't do so well in it, but now I am working back through the book, and it is making A LOT more sense than it did back then. However, I was looking for some worked...
  37. I

    Interesting Telescope Image Recording and Transmission Design Problem Need help

    Homework Statement You have been tasked with the design of a new far-field, high resolution imaging system to be placed on the Hubble Space Telescope. This system will be used for taking deep space astronomical images with an exposure adjustable between 10 minutes and 24 hours based on the...
  38. Loren Booda

    Medical Has infrasound been used to image the human body?

    Is it possible to scan humans with ultra low frequencies to study medically one's physique?
  39. M

    Focusing on a small image from a short distance

    I apologize if the breadth of this question requires a response beyond what anyone is willing to contribute. I've started researching optics ( of which I have little knowledge ) and feel immediately overwhelmed. Problem Using a DSLR ( with a DX size sensor ) and preferably the available lens...
  40. A

    Would it be true if I said that the image of x is contained in f(X)?

    Homework Statement Let (X,d) and (Y, p) be metric spaces and f : X -> Y a function. Prove that f is continuous at p-0 if and only if for every ε > 0, there exists a δ > 0 so that the image of Bd(p-0; δ) is contained in Bp( f (p-0);ε). Homework Equations The Attempt at a Solution...
  41. Andre

    Is Image Deblurring Possible with Sequential CCD Scanning?

    Is it true? http://tv.adobe.com/watch/max-2011-sneak-peeks/max-2011-sneak-peek-image-deblurring/ Worth a look.
  42. L

    Kernel and image of linear transformation

    Homework Statement For the linear transformation T: R4 --> R3 defined by TA: v -->Av find a basis for the Kernel of TA and for the Image of of TA where A is 2 4 6 2 1 3 -4 1 4 10 -2 4Homework Equations Let v = a1 b1 c1 a2 b2 c2 a3 b3 c3 a4 b4 c4 The...
  43. L

    Finding Kernel and Image of Matrix transformation

    Homework Statement Matrix A = 0 1 0 0 0 1 12 8 -1 Let E1 = a(A)(A+2I)2 Let E2 = b(A)(A-3I) For each of these, calculate the image and the kernel Homework Equations I found a(A) to be 1/25 and b(A) to be 1/25*(A-7I) Also, if I am not mistaken, I think KernelE1 =...
  44. U

    MATLAB Using Image processing toolbox on MATLAB.

    Hi, I have a movie that contains a particle moving from one end of a channel to another end. The velocity of the particle is super-fast. I need to know how I can estimate the time and pictorially (like using a histogram--similar to plotting the heart pulses of a person) be able to tell when the...
  45. C

    Question about Linear Operator's Image and Kernel

    Homework Statement If T:V\rightarrow V is linear, then Ker(T^2)=Ker(T) implies Im(T^2)=Im(T). Homework Equations Let T:V\rightarrow V be a linear operator such that \forall x\in V, T^2(x)=0\Rightarrow T(x)=0 (Ker(T^2)=Ker(T)). Prove that \forall x\in V, \exists u\in V\ni...
  46. U

    MATLAB- image processing need idea for code

    Homework Statement As per the attached picture, we are basically trying to find out the time interval between the instants that the particle (black dot) is in the first region of interest and the instant that it is in the second region of interest. i have a video in which the particle in...
  47. T

    Linear Algebra: Kernel and Image question

    Homework Statement T : R^{3} -> R^{3} is a linear transformation. We need to prove the equivalence of the three below statements. i) R^{3} = ker(T) \oplus im(T); ii) ker(T) = ker(T^{2}); iii) im(T) = im(T^{2}). Homework Equations R^{3} = ker(T) \oplus im(T), if for all v \in...
  48. M

    Optics question. Given Diameter and object distance find image distance.

    An object is 9.79 cm from the surface of a reflective spherical Christmas-tree ornament 8.96 cm in diameter. What is the position of the image? Answer in units of cm I know that i need the radius of curvature to find the position of the image, but I'm not sure how to get that from the...
  49. M

    Google Image search is amazingly accurate

    Google image search is the best place when searching for images on something. But I have always thought, "What if I have an image and I need to find out what it is about." Shazam works well for audio, but Google has finally done it with images. I noticed a week ago that you could drop images in...
  50. P

    How Is Image Dithering Computed?

    After reading about how dithering works for created the sense of a larger range of colors from a small color palette, it makes sense how it works, but how in the world do computers figure out how to dither an image so that it looks correct to us? Is the fact that blue and red combined create...
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