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Questions tagged [camera]

A device used to record static or moving images, either digitally or on a physical medium. The images captured may be in any region of the electromagnetic spectrum such as x-ray, infrared, visible, or ultraviolet and beyond.

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Why is a bigger camera sensor better at low light than a smaller one?

People say a bigger camera sensor is better for light performance as the photo sensors are bigger and hence let in more light. But couldn't you just let the same light in and focus it down onto the ...
George kirby's user avatar
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Track an object velocity in a 2D plane

I would like to track the motion (actually, I am more interested in the velocity) of an object in a 2D plane (typically 4m x 4m). The object speed is typically 10cm/s, but the mouvement may be chaotic ...
Majorana's user avatar
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46 views

Efficiency of light collection of a lens

I am trying to calculate the theoretical imaging performance of a scintillator & camera combination, (scintillator is a plane that emits optical light under X-ray exposure). My question is I found ...
bbbeenn32's user avatar
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48 views

Reflect visible light transmit infrared light

I have a color camera and PIR sensor inside a commercial security camera which records when motion is detected. I want to hide the security camera behind a 1/2 inch polycarbonate window which reflects ...
rjj100's user avatar
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2 votes
1 answer
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My phone sees the NIR from a TV remote. Why does it not see the NIR in rainbows?

My Pixel phone's camera shows the IR light from the LED of a TV remote as a magenta/lavender color. That wavelength is likely around 940 nm. Now, when I take a picture of a rainbow in the sky, it does ...
Guillaume's user avatar
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59 views

Can I use Gaussian Optics and Aberration Theory to find the direction of a ray from the sensor to the world?

I am working on a master thesis which is a continuation of a previous one, which can be found here, with a nice summary: https://twitter.com/dearlensform/status/1465776613094797319 The thesis is ...
Syrinxos's user avatar
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1 answer
55 views

Effect of ambient fluid on a pinhole camera's intrinsic parameters

Suppose I am performing calibration of a pinhole camera under the Brown–Conrady distortion model and find the focal length $(f_x, f_y)$, principal point $(c_x, c_y)$, radial distortion coefficients $...
rgov's user avatar
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How can a camera capture the movement of light (in slow motion) if the electronics operate below the speed of light?

A while back I saw the MIT produced video where they show their camera capturing 1-trillion frames per second and show the light moving around a coke bottle in slow motion. https://www.youtube.com/...
Colton Campbell's user avatar
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22 views

C-mount lens filter and focal length

I'm building an eye-tracking system for mice. For that, I am using a monochrome camera that would capture Infrared Light out of an 850nm LED, and a zoom lens to refocus the image when needed. I also ...
evernerve's user avatar
1 vote
0 answers
156 views

What is the Point Spread Function of a pinhole camera?

Is the geometric spread of a pinhole camera a uniform blur convolution? Pinhole cameras have blur due to a. wave effects (diffraction) and b. ray effects (geometric properties). This question ignores ...
SRobertJames's user avatar
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Why scratches/tape affixed on lenses don't appear in the images captured?

I read this article about dirt on lenses. https://photojottings.com/dirty-lens/ In this, the author puts a small tapes on the lens and we can still see the image. We don't see the tape anywhere in the ...
NoviceB's user avatar
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2 answers
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Why does my glossy blue guitar reflect different color images on my phone, but reflects white from a gelled camera flash

I have a blue glossy guitar that I was trying to photograph for product photography practice. I wanted to have a pink rim light on it, so I angled the flash appropriately and put a pink gel on it. ...
Mister Oogway's user avatar
-1 votes
1 answer
127 views

How to reduce camera field of view (FOV)? [closed]

If I have a camera with a FOV of, say, 17⁰ deg, how can I limit that FOV to 1x1 deg? I imagine some sort of mask is what I am looking for, but what needs to be considered in designing a solution?
pbhuter's user avatar
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1 answer
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How can I determine how much energy a sensor pixel can withstand before exploding? [closed]

I am trying to design a camera system to image a laser beam. I know the sensor is a Sony IMX226, and I have the data sheet for this sensor. The data sheet, however, does not list a maximum energy ...
Benzene enthusiast's user avatar
2 votes
1 answer
136 views

Strange behaviour of ultra dark image in a CMOS camera? [closed]

Samsung Galaxy S21 Plus has a CMOS camera. I recorded an ultra dark raw (DNG format) image using its Pro mode in the following conditions: ISO 50 Shutter speed 1/12000 Cover the aperture with ...
Ritesh Singh's user avatar
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Vertical peaks in single slit diffraction pattern

I have the output from a single slit diffraction experiment using a HeNe laser (632.8nm), the diffraction grating is placed vertically so you expect to see only horizontal diffraction peaks in the “...
BaronG's user avatar
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How to calculate Distance $D$ to object from a camera with known $H$?

I am using algorithm to draw a bounding box around object when they appear in camera as shown in attached image. The main confusion is that i consider the object closer to camera when the Distance $D$ ...
Ali Waqas's user avatar
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1 vote
1 answer
196 views

Why does cooling down thermal imaging cameras increase sensitivity?

A lot of high-sensitivity thermal cameras and sensors are (cryogenically) cooled down to low temperatures to achieve these high sensitivities. For example. the Stinger missile, and the James Webb ...
Nick van der Kroon's user avatar
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0 answers
35 views

Is it possible to obtain noise level in electrons using only one camera?

In the link, https://www.photonstophotos.net/GeneralTopics/Sensors_&_Raw/Sensor_Analysis_Primer/Photon_Transfer_Curve.htm there is one figured called Standard Photon Transfer Curve – Multiple ISOs ...
Jogging Song's user avatar
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1 answer
63 views

Are there Wolter telescope lenses for consumer cameras?

Wolter telescopes are used for x-ray astronomy. However, I see no reason why they couldn't be used for visible light as well. How would a visible image look when taken through a Wolter telescope? Are ...
SarahJuliet1510's user avatar
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1 answer
255 views

Narrowness of black bars to be resolved by camera?

So the question is: A digital camera has a lens with a focal length of 10 mm. The image sensor, i.e. the photosensitive part of the camera has 7.5 x 7.5 μm pixels. A test map with a variety of ...
Tarmiac's user avatar
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-1 votes
1 answer
56 views

Why doesn’t an irregular or polygon shaped hole work like a pinhole camera when held close to the screen?

When a card with a hole of any shape is held close to the screen, the lighted area on screen is of the same shape as the hole. To make an image of light source, say Sun, the card has to be moved away ...
AshutoshB's user avatar
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2 answers
410 views

Cameras that can see through opaque objects

Are there cameras which can see through opaque objects (i.e. a reasonably dense curtain, cardboards or walls)? And by see I mean in almost full color the way a regular camera would work.
Albert Kinterman's user avatar
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4 answers
451 views

What if cameras get better than our eyes?

What happens when camera technology evolves so dramatically that (without considering zooming) camera lenses get “better” than our human eye? Do we see the footage in higher definition, or do we ...
Daan Rijks's user avatar
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3 answers
1k views

How can a digital camera capture and render IR (and UV) light?

It is known that you can see IR with digital camera. I have personally tested with camera of phone and webcam with a RC of A/C. It is seen as mostly white light with red tint. I haven't tested with ...
Abdullah Ibn Fulan's user avatar
1 vote
0 answers
73 views

Weird pattern for a laser beam spot

I am trying to measure the gaussian profile of a laser beam, which is supposed to be T00. The profile shown in the specifications looks very Gaussian, and the laser is brand new. I am using this ...
JohnDoe122's user avatar
0 votes
1 answer
113 views

How our eye see real images formed by pinhole camera? [duplicate]

How do we(eye) see real image form in pinhole camera? 1.Are rays that are forming image pass through screen and reach our eye help us too see it ? OR Light rays from hole from where we are looking at ...
user avatar
1 vote
1 answer
289 views

How pinhole camera works? [closed]

What is the working principle of pinhole camera? What is the function of translucent screen in the camera? Now, if we look behind the translucent screen, what do we actually see: the image formed on ...
user avatar
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0 answers
37 views

Is it possible to use a distributed camera array to fake an interferometric sensor without phase data?

Astronomical interferometry is a technique which uses multiple small telescopes to mimic one giant telescope. It requires the phase of the light to be captured for it to work. It is widely used in ...
Adam Lincoln Steele's user avatar
2 votes
2 answers
98 views

Can there be multiple shot noise sources? For example: laser & camera

Suppose you have a system consisting of a laser, a filter (with transmission $T$), and a camera. To my understanding, both the laser and the detector produce shot noise. Is that correct? For a camera ...
Jan Jansen's user avatar
1 vote
1 answer
464 views

Simulate a camera PSF?

Say I have a $3D$ object stored as a $3D$ $\texttt{NumPy}$ array in python. I want to view this $3D$ object as a camera would give: a particular aperture, focal length, etc. My understanding is I can ...
bbbeenn32's user avatar
0 votes
1 answer
168 views

Resolution of a Michelson Interferometer using a Webcam

I've built a Michelson interferometer which uses a webcam as screen. This setup shall measure and correct drifts in optical path difference of the two interferometer arms. I have problems determining ...
Radiokucker's user avatar
1 vote
1 answer
98 views

Is it possible to get a resolution that is better than what is given by the Rayleigh criterion?

I remember reading recently that it is possible to unblur a face that has been blurred by using a computer to process multiple images of the blurred face from different angles. This got me thinking, ...
user73910's user avatar
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0 votes
1 answer
213 views

Does a thermal camera detect distant objects colder?

Thermal cameras are often calibrated and display the temperature color-coded in $^\circ$C and I wonder how that works... A black body emits photons because of it's thermal energy. The hotter it is, ...
Charles Tucker 3's user avatar
0 votes
1 answer
113 views

Damage from the Sun on a Raspberry Pi Camera Sensor with a Fisheye Lens

I'm working on a CubeSat mission which uses two Raspberry Pi V2 cameras (without special filters) as sensors. I am trying to estimate if they could suffer thermal damage if they were to have the Sun ...
user7432298's user avatar
1 vote
1 answer
190 views

Does the size of CCD/CMOS of a telescope affects the magnification?

For a normal, traditional telescope, the magnification level should equal to focal length divided by eyepiece diameter, i.e., $$Res=\frac{f}{D}$$ So does the size of the CCD/CMOS the same as eyepiece ...
Jack the Ranger's user avatar
0 votes
1 answer
146 views

What's limiting the field of view of a lens

An ideal lens with finite aperture leads to the formation of an image in the image plane as \begin{equation}g(x, y) = \int \text{psf}(x/\lambda d - x', y/\lambda d -y') f(x', y') dx'dy',\end{equation} ...
user2224350's user avatar
25 votes
12 answers
7k views

Why do images not appear inverted when looking directly through a pinhole camera?

I understand that the way light takes through a pinhole creates an inverted image on a surface behind the pinhole. I remember this effect from school experiments, it's also described in this wikipedia ...
heinrich's user avatar
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-3 votes
3 answers
125 views

Relativistic-speed cameras [closed]

I am asking on behalf of someone else. Here is their question: Two cameras, each recording video at 500 trillion fps, are speeding toward each other at $0.6c$, on a direct collision course. When the ...
WarpPrime's user avatar
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1 vote
0 answers
26 views

What is the right camera lens for imaging this experiment?

I am conducting an experiment in our lab where we are using an ICCD camera to image a very short-duration (ns) physical phenomenon. The area of interest of the test is about 25mm x 25mm and I need to ...
Time4Tea's user avatar
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0 votes
2 answers
302 views

Why is the geometric spread and dispersion spread in a pinhole camera independent?

About 6:08 of this video, the equation for geometric spread($ x_{geo}$) is derived for a pinhole camera: $$ x_{geo} = \frac{d}{s} (f+s) = d(1+ M)$$ Where, $f$ is focal length $s$ is subject length $d$ ...
Cathartic Encephalopathy's user avatar
1 vote
1 answer
56 views

Technical name (radiometric/photometric/ray-optic) of the physical field that is measured with a camera

A camera (that is FPA and objective) is a device that measures [intensity][1] or radiant intensity vs. two angles (horizontal & vertical). So it generates a representation of the physical quantity ...
Andreas H.'s user avatar
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0 votes
0 answers
30 views

Relating exposure time of a camera to number of photoelectrons

How can we relate the exposure time of a camera to the number of photoelectrons created on the detector? We know the power and the wavelength of light hitting on the camera, quantum efficiency of the ...
sahin's user avatar
  • 513
2 votes
1 answer
328 views

Can a curtain create a focused image on an opposite wall?

This video* (linked at the correct time of 0:26 sec) shows a scene inside a room of a home. Apparently projected on the wall is an imperfect but recognizable image of the outside street scene. The ...
StayOnTarget's user avatar
-5 votes
1 answer
365 views

Type of camera that is used in a double slit experiment [closed]

I need to know the type of camera that is used in a double slit experiment. Both with photons, and that with electrons? Can someone please answer. The type of camera that is used for observation. Is ...
Kamran Naqvi Amrohi's user avatar
1 vote
0 answers
174 views

How do single-pixel cameras work?

To obtain images using a single-pixel camera we need a Digital Micromirror Device (DMD) because single-pixel cameras only possess a single detector (article). From my understanding, a single-pixel ...
user7077252's user avatar
0 votes
3 answers
553 views

If image formed by a plane mirror is virtual, then how are we able to capture that in a camera?

What I have learnt in school is that, we are able to see images behind a mirror(virtual image) because our brain assumes that the diverging rays that our eyes see, are coming from a point behind the ...
Chahak's user avatar
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0 votes
1 answer
93 views

Specular Reflection of IR Light

I have started to use thermal imaging cameras more and more and realized that I can see the reflection of my self bouncing off of a glass window through the IR camera. When viewing it on my monitor, I ...
Ronnie Watkins's user avatar
0 votes
1 answer
85 views

Pinhole camera as a device to develope photos of distant stars? [closed]

Could a transparent slab coated with photosensitive film be placed inside a pinhole camera nearly paralel to the path of the light emitted by a source of light(star) to produce a picture wich due to ...
Krešimir Bradvica's user avatar
2 votes
1 answer
139 views

Vision: eyes vs cameras

I think this is related to physics, and light waves. Is there some materials that can be seen by human eyes and can't be seen by cameras? (Imagine a special writing) Is that even possible therotically?...
Daniel98's user avatar
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