Cameras Definition and 46 Threads

##d/2F = U/2D## ##d'/2F = 0.01U/2D## d' - the size of the object's reflection on the image sensor ##pixels size = d/N ## since we want N to be minimal, the pixel size should be maximal: pixels size = d' hence : ## N = d/(pixels size) = d/d' = 100 ## My final answer does not depend on U...

Would it help to study Verilog (VHDL) or Field-Programmable-Gate-Arrays (FPGA) if self-crafted x64/aarch64-assembly would take too much power/be too slow?

Most of us have cars with backup cameras. They are inexpensive, simple, lightweight, and reliable. Teslas have as many as 7 cameras looking in all directions. I think that cameras showing views of wings, stabilizers, rudder, engines, landing gear, cabin, cargo hold, would be of great use to...

Can infrared cameras focus IR radiation as a visible light camera focuses visible light? I think IR doesn't pass through glass well? What are these germanium lens about? I don't think my Flir IR camera has a lens.

I am reading How computers work and I don’t grasp it. So how is light ultimately get transformed into a beautiful picture on screen in a digital camera? I have got D5200 Nikon. It’s a nice begineers camera.

For many years, the on-bike cameras in Sportbike/Superbike/MotoGP racing showed the leaned images tied to the bike that the cameras were mounted on. Great stuff, but the new camera video from some of the MotoGP bike camera feeds for the last few years have included gyroscopic horizon...

Hello All: i saw some youtube videos on testing IR controllers on normal with no add ons Cell phone camera and the cell phone screen is showing signal emitted by the IR LED of the remote controller , how the cell phone camera sensor are able to register a signal from an IR LED , the pixle in...

Is it feasible to install CCTV cameras for recording Plays and Dramas in Auditorium? The CCTV cameras should be positioned properly to get complete 360 degree view of the location where the play or drama is running in the auditorium. Thanks & Regards, Prashant S Akerkar

When the camera can oversee the human eyes?

Hello Forum, I am wondering why infrared cameras can only detect radiation between 1micron to 15micron. This clearly depends on the sensor's material. Based on Wien's law, this corresponds to temperatures from -79C to 89C. Are infrared cameras only detecting within this spectral range because...

Homework Statement Homework Equations [/B] Equations of motion: v = u + at s = 1/2 (u + v) t s = ut + 1/2at^2 v^2 = u^2 + 2as 3. The Attempt at a Solution Hello, on a i used the 2nd equation: 30m = 1/2 (3*10^8m/s+3*10^8m/s) t so -> t = 1*10^-7s but to get the correct solution i...

Hi guys ! I'm trying to understand the perspective distortion that can be observed in our vision and cameras, so many pages on the web that talks about photography says that the perspective distortion can be controlled using different focal lengths lenses, meanwhile a reduced group of pages...

Hi All, It is known that ordinary cameras can make infrared radiation which comes from remote controls visible at their own display. My question is about the explanation of this fact. Is the electronic process simple to describe? It seems that the infrared can produce photocurrents which are...

If they work like I assume they do, by comparing the wavelength emitted with the wavelength reflected back, they might use an interferometer. If so, how does it work?

Andy Resnick submitted a new PF Insights post Digital Camera Buyer's Guide: Real Cameras Continue reading the Original PF Insights Post.

Hello, I would like to know if there are simple ways (using trigonometric functions) to calculate distances between an object and two cameras. I am using two CMUcam5 (pixy), closely placed (the distance between the two cameras is known). And I would like to calculate the distance between the...

I can remember from my distant school physics days that the image in a mirror lies beyond the mirror. But how does a modern camera sensor "know" this. If I face a mirror with my canon camera which has a cmos sensor and usm lens, it autofocuses correctly on the part of the reflection I select...

Why do high end camera modules have so many glass lenses, apart from the necessary lenses for focus and zoom why is it that in cameras like DSLR cameras there are so many low power lenses where a few high power ones would work do the same job, do the lenses diffract light differently when...

Hello Forum, Why are infrared (thermal) cameras, those that produce interesting thermographs of objects, mapping their surface temperature, so expensive? IR sensors are ubiquitous and very inexpensive...What is the difference? thanks, fog37

After going on a ghost tour over Halloween, several people were able to take photos of ghosts seen through an old hotel window, a few stories above our position. This got me to wonder if this was a trick that relied on the way that the digital cameras may be able to detect non-visible...

I've been looking all over and it appears like I may be using the wrong words to really get a solid answer. I figured I would ask here and maybe someone could either give me a few better terms to help my search or would know the answer already. Thanks in advance! I'm working with a team...

http://www.wtsp.com/news/local/story.aspx?storyid=316418 Cutting yellow light times increases revenue but decreases safety. http://saferstreetsla.org/590/data-safety-benefits-longer-yellow-signal-times/

Hi All... Just popped up in my news feed: - http://www.bbc.co.uk/news/uk-scotland-highlands-islands-22292053 Could be interesting although there's only one image of the inside on the BBC news item. And - to dismantle it: -...

I'd like to get images at a frequency of at least 100 frames/sec to measure servo arm speeds (including acceleration from rest) under various torque loads. This is for personal research associated with RC helicopter accessories, but as a high school physics teacher it seems it would be good for...

Hello Forum, I have an IP camera that has some amount of LAG from when the movement occurs to when it shows up in the browser. What causes that? If I bought a more expensive camera would it the lag disappear? the camera works well with Internet Explorer (remotely). but It is terrible...

what resolution are the cameras on the new Mar's rover "Curiosity"? i read somewhere that the high-res cam was only 2mp, but i am unable to find any real specs. thanks.

16MP Cameras?? I've been in the market for a new digital camera and I've noticed something odd. Back when I last even looked at digital cameras, everything was 6MP-8MP at the most. People said that sensors over 6MP were useless because the standard sensors at the time were so small that some...

Homework Statement how is flash created? The Attempt at a Solution flash makes images caught on a camera brighter and the background dark. why does this happen? what exactly is flash made up of? how do you explain the effects of flash?

I’m not sure if they are even used anymore, but back in the day engineers used spark cameras to capture very brief timescale events.

First, I am curious about why CCDs need color filters in the first place. It is said that they are necessary because digital camera sensors can only sense intensity of light, but not wavelength (color), which makes sense initially... except that CCD sensors operate by utilizing the photoelectric...

This is scarey .. http://abclocal.go.com/wabc/video?id=7621105

So they use the photoelectric effect right? Does that mean when the camera takes a picture it allows photons of light to interact with a sensor for a certain period of time? How does that create the picture? If i understand it correctly the different photons have different frequencies and their...

There have been two break-ins in our neighborhood in the past two months which got me to thinking about security cameras. This is my first day researching security camera installations. I didn't know anything about IP cameras before today and didn't even know that they existed (I didn't realize...

Does anyone know what current voltage, amps would be required to produce a corona around an electrical wire? I gather that this would also be dependent upon the wire material and size. I have seen photos of this and would like to do reproduce the process. What type of camera may these...

Eyes and cameras - a topic that has been troubling me Hi all. This is my first post. I'm seriously thinking about applying to optometric college in the fall. I'm trying to improve my knowledge as much as possible of the area, and one question that keeps coming up (I'm a hobby photographer...)...

Hello, What are the important differences between CMOS and CCD? I am studying the digital cameras

Hi all Is it possible that a RADAR speed camera, (the type that bounces off the road and is reflected off the vehicle and then the doppler shift represents the vehicle speed) can be affected by a raise in surface temperatue on a very hot day(40 degrees C plus, poster is in Australia) I...

For an experiment we are doing, we need to be able to accurately detect people inside a car moving at high speed. Any suggestions for an IR/other camera that can help us effectively do it? The car has a hot engine, so I am concerned an IR camera may or may not work. Any thoughts. Cost not a...

I have a camera (Camera 1) that has the specifications: 3 mega pixel resolution, 10x optical zoom, 120x digital zoom. The camera can see an object which is 100 feet away from it. Now, I have two other cameras. Can the other two cameras also see the object? Will the object be less clear? Out...

If thermal cameras (TC) could be cheap, they could be located in many buildings and the can have huge efect on reduction of epidemics spreading. (Do you agree?) One TC cost around 10000$. What is the problem for world consensus for research for cheaper thermal cameras? It is cheaper and with...

Does anyone have any experience of this kind of optics or is this just another hoax? http://www.davidsteele.com/X-ray-Vision-Camera-Lens-p/xr-l.htm

Homework Statement Why does a camera get wider/longer? Homework Equations N/A The Attempt at a Solution Well, I assume that it is to produce the largest image that can possibly be on the film. But I'm a little confused on the question as a whole? Am I on the right track and...

So for a project I am asked to give examples of how cameras are used. Of course the obvious use is clear, but how else (hopefully physics involved ways) are cameras used? Forgot to mention, my project is on photographic not digital cameras.

Homework Statement What physics principles are applied to the design and use of digital cameras? 2. The attempt at a solution • Charging the battery requires electrical and magnet field use from the source it is obtaining the energy from. The battery creates electric potential...

hello, i am not sure that this is the correct forum to post in, but i am confident that the moderators can swiftly correct my error if that is the case. I was wondering a little about cameras and their auto foucs. How does it work and what is the math behind it?

do TV cameras have autofocus? and, do USA tanks have some alarm system telling them if they are been targeted with an IR system?