The imaging tag has no wiki summary.
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1answer
50 views
Photo of reflection in magnifying mirror shows normal magnification. Why?
I just took a picture of myself in one of those magnifying shaving mirrors and in the photo I am unmagnified! Why is this?
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0answers
41 views
Are there any existing technologies which use 2D images to extract 3D data? [closed]
I had an idea to use 2D images to extract data about wind velocity from raindrops. (Determining Wind Velocity from Images of Raindrops) which inspires me to ask this question.
I understand that there ...
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3answers
297 views
Can we make images of single atoms?
I was wondering how far in imaging physics had gotten. Do we hold the technology to actually take a picture of, say, an alpha particle, or even a single atom?
I realise we aren't talking about camera ...
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1answer
30 views
Is There Reddening on Objects Other than the Moon Upon Entry into Earth's Umbra?
With the recent lunar eclipse, for some reason this question came to me: The reason the Moon turns red is that the only appreciable sunlight hitting it when it's in Earth's umbra is refracted through ...
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5answers
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Exoplanet detection via space-based parasol
I remember from watching Cosmos years ago, Carl Sagan suggested an interesting hypothetical method for directly seeing exoplanets. He proposed that in the 'future' we could launch a satellite designed ...
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3answers
130 views
Put a sensor at the focal length, behind, or in front?
My intuition tell me that at the focal length a convex lens all the light converges to a point. Following that logic, it would make sense to me that a camera chip would either need to go slightly in ...
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1answer
122 views
Peak deconvolution [closed]
I need some help understanding how much information I can pull out of this data. I have a sample made up of two materials. Materials A and material B. Then I took a picture of the sample.
The two ...
6
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1answer
68 views
Detecting dim objects
What are the minimum conditions (switching times, sensitivity ...) for a camera to detect dim objects, e.g. Oort cloud or Kuiper belt objects, passing by in front of a star in the background?
I've ...
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1answer
52 views
Shadow of a Jovian moon over the Great Red Spot
Where can I find pictures of the shadow of any of the Jovian moons partially covering the Great Red Spot?
A series of such pictures over time would even be better. The idea is to learn more about the ...
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4answers
577 views
Usage of helium in MRIs
More and more articles pop up on the shortage of helium, and on the importance of it. Its usage in MRI's spring to mind for example. I looked it up and found out that helium is used for its 'low ...
3
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1answer
415 views
How does a stronger magnet affect the MRI image quality?
In which ways is a stronger magnet better for magnetic resonance imaging? I read that:
The field strength of the magnet will influence the quality of the MR image regarding chemical shift ...
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2answers
92 views
What is an extreme deep field image (XDF) and how is it captured?
NASA recently took this Extreme Deep Field image (XDF) that is the area of only small fraction of the dia of moon and contains 5,500 galaxies. Nasa says this was capture by extreme long exposures so ...
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1answer
43 views
Does an uneven and/or moving surface affect quality when using a solar filter?
I have chosen to make my own solar filter using Baader as opposed to Mylar or anything else based on these: http://physics.stackexchange.com/a/25204/6805 and ...
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1answer
710 views
How do Anamorphic images work? [closed]
I found the following anamorphic image on this site
Can anyone explain the physics behind the working of such images? Can we create our own anamorphic images? If so how?
Thanks in advance.
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1answer
151 views
Curved lines in a picture (Photography)
My problem is when I take a picture (a close one) the straight edge looks a little curved. In a standard camera, like a CyberShot.
I would like to know if there is some relationship between the ...
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1answer
69 views
How to determine the angle a camera has to be at to image a desired scene, given the camera parameters?
Reviewing old material I learned years ago, having a hard time rewrapping my head around the relationships in capturing images from a camera.
Imagine a scenario with the camera placed on the ground ...
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4answers
246 views
How to guess the content of a christmas present?
Let us assume that the present does not make any recognizable sounds when shaken (meow splat - the present now contains a dead kitten). Let us furthermore assume ...
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1answer
220 views
How to determine the required resolution to view an image at a certain size?
If I have several camera specifics, can I determine the required resolution to view an image at the size I want?
For example, let's say I want a picture of a square painting to be at least ...
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1answer
117 views
How does the focal length of the lens change the distance from the camera to an object?
I am reviewing some old image processing notes and have the following problem:
I have a camera with a projection plane of $2cm\ by\ 2cm$ and a $15mm$
lens. If you want an $1.5m$ object to take ...
2
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1answer
603 views
How to determine the field of view for a pinhole camera with given parameters?
I am reviewing some old material I learned years ago and am having trouble figuring this one out. Can somebody confirm that I have done my math correctly, and tell me how I can recover the field of ...
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2answers
316 views
why isn't the variance of Fano noise proportional to the number of photon arrivals?
I've been reading "Photon Transfer" by James Janesick and in Chapter 3 (http://spie.org/samples/PM170.pdf) he describes the various sources of noise in a CCD. Basically, incoming photons interact with ...
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4answers
561 views
Optical explanation of images of stars?
Very often when viewing pictures of the cosmos taken by telescopes, one can observe that larger/brighter stars do not appear precisely as points/circles on the image. Indeed, the brighter the light ...
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2answers
106 views
PSF Measurements In Fluorescence Imaging
Quite a technical question!
I have measured the Point Spread Function of 100nm fluorescent breads with my Olympus scanning head. I'm two-photon exciting the beads with a wavelength of 800nm and ...
