Camera Definition and 299 Threads

Hello all, I'm currently using an infrared camera to determine the emissivity of a steel. The camera "sees" whatever radiation entering the objective, and calculates the temperature of the steel by assuming it's emissivity is 1. I figured I could use an energy balance to find the emissivity...

Since it is impossible to get certain cleaning solutions (in Canada, at least) like "Eclipse" (methanol) and pure isopropyl alcohol (from drug stores) is adulterated with some kind of greasy oils that leave smear marks behind, I would appreciate some help as to what chemical solutions might be...

Is it possible to use a thermal imaging camera to detect the heat signatures of a security camera? Are you familiar with any equipment which can detect its electrical, electromagnetic or metalic signatures? You might wonder why I'm asking. It's because I'm a bachelor degree student in...

For a given pinhole size in a camera, and camera size, what would be the optimal pixel size to get the maximum resolution at maximum light intensity? i.e. the larger the hole, the more light enters through it, but eventually the sharpness would drop below the resolution. Conversely, the...

Omnivision? Or developed by apple itself?

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...

Homework Statement Prove that a line in 3D space is imaged to a line on the image plane in a pinhole camera model. Homework Equations A 3D point give by (X,Y,Z) will be imaged on the image plane at x = f(\frac{X}{Z}) and y = f(\frac{Y}{Z}) where f is the focal point. The Attempt at...

...set it up in some kind of circuit in which I can press a button/ hit a switch and have the flash go off? I need to create and electric device of some sort, and seeing as I have a bare minimum supplies, I thought this may be plausable. I also need to draw circuit diagram to this. I am...

Problem: I'm trying to optimize an inexpensive digital camera with a CCD sensor for NIR video. As of right now (after removing the IR filter) it doesn't work well in the dark at all (even with a basic visible light filter ... obviously). I have to direct at least a little bit of regular light...

New Video on "One trillion frames per second camera" Here is the video: Mods, please delete if there is already a thread for this. I think this is a great achievement by the researchers. It's an interesting topic, so maybe people can use it to ask questions on how/why it works, and...

I've a digital camera since 2005 and it started going bad maybe 1 or 2 years ago. Basically most of the time when I want to take a photo it turns automatically in filming mod. I have to wait/shake the camera in order for it to turn back to photo mod and that's pretty annoying; even more...

So I'm taking a bunch of pics at regular intervals to show my class how this borax/glue slime slowly collapse and spread. This happens over the course of a few minutes and it gave me an idea. Is there any software out there that you could hook up your digital camera to and have the software take...

I don't have any idea how to go about this... Please help!:frown: A pinhole camera produces an image of an object kept at a distance of 100m from the pin hole. If the screen is 10 cm from the pin hole and the image is 5 cm high, what is the height of the object Any help will be...

Homework Statement http://imageshack.us/photo/my-images/855/10544781.png/ Homework Equations a=[r''-r0'^2]er+[r0'' + 2r'0']e0 where 0 = theta The Attempt at a Solution stumped about it, I've tried setting the above to 0 then work out r which is 200 m but that's just cluelessly...

Many people use the iphone nowadays. But I wonder if they know exactly how it works? I found a description of the technologically advanced iphone 4s camera features, and I curious as to how it works. The lines in red are what I found from the apple website. The iPhone 4S camera gives you 8...

Hi, I do not know anything about relays. I been trying for days to hook up a relay to turn on a light using an Axis camera with an I/O switch. This is the relay http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&itemSeq=105585863&uq=634536768231996536&DPU=submit This is the manual...

A camera falling from a blimb... pleasezzz help (part 1 of 2) A camera falls from a blimp that is 349 m above the ground and rising at a speed of 17.2 m/s. Find the maximum height reached by the camera with respect to the ground. The acceleration of gravity is 9.8 m/s^2 Answer in units of m...

Hey You may have seen the mosquito killing laser system from the intellectual ventures lab. In the description of the system they say the zoom camera identifies an object (mosquito) and from that they are able to direct a green laser on it and track it. What I am wondering is how the...

Hello folks :smile: My girlfriend and I are leaving on September 14 for a 6-week humanitarian effort in Ghana, Africa. We organized the trip through a group called http://villagevolunteers.org/" . The DSLR is amazing and we will definitely be bringing it with us. What we are looking for, is...

If you were infinitely close to the speed of light, and you attempted to take a picture of yourself, would it work? Would there be any way to make it work using relative velocities?

Hi there, I understand somewhat how diffraction works in terms of the aperture of a camera lens and the resulting loss in resolution in the image, but my question is: Is the degree of diffraction only dependent upon absolute aperture size, or the size of the entrance pupil? For example, f/22...

A quick post before heading out on vacation: Thanks to everyone with their advice on getting through TSA screeners- there was no issue at all. Here's a few shots out the window- daytime: http://img687.imageshack.us/img687/4154/74592845.jpg and sunset...

Forgive me if I'm missing something truly basic about photography, but I always wondered why camera photos appear blurred if the object's moving fast. Isn't the speed of light large enough where, even if the object is moving rapidly, the time it takes to reach the object is negligible compared...

I want to know why someone hasn't built a 'rover' of some sort that could easily navigate the lunar surface while recording HD video. I don't think funding would be an issue since you could easily strike a deal with a large company pertaining to product placement i.e. a coca-cola bottle in the...

Homework Statement True or False: If a pinhole camera casts on the screen an image of 40.0cm in size of an object situated at a distance of 40.0m from the camera, then the size of the object is 10.0m. Homework Equations M = hi/ho = di/do The Attempt at a Solution hi = 40.0cm do...

Large Format Photograph Machines usually uses 8x10 inches size negative. Can I make a radar large format camera with using similar or bigger size plate as antenna and when transmitter was a cw radio transmitter ? I know only need of mixing transmitted to received. If this does not work , can...

I have an optical design question - hopefully this is the right forum in which to ask. It is "engineer", but it's really optical engineering... --------------------------------------------------------------------------------- I am wondering if someone can help me out here with a few...

Hello, i have a college seminar due 1 week from today and our group has already done the writing part of it, but now we need to take a few pictures with the IR camera itself and we are clueless what to actually shoot because the idea must be innovative and simple and must be backed up by heat...

Hello, Here is my problem: I've created reference pattern for camera calibration. It consist of well defined dots where each dot is unique. What I'm trying to do is to estimate lens distortion from only one photo. I can easily identify dots on photo, but I have no idea how to estimate the...

Homework Statement How long the camera can be operated in the 9.5 Watts recording mode using an initially fully charged battery. P = 9.5 W, V = 7.2 V, I = 1.3194 A Homework Equations (Cb) = I x t The Attempt at a Solution (Cb) = I x t = 1.3194 x 3600 = 4749,84 minutes...

Hello everyone, I have a basic (I think) question about how a consumer video camera is programmed to do what it does. The camera I have in mind is the Flip (may it rest in peace). Ok, so I'm aware of most of the parts that go into a video camera, such as the shell, controls, lens, sensor...

I'm making a coil gun for a project, and ran into a few problems. I used a circuit from a disposable camera, which had a capacitor and charging circuit. I used two wires attached to the capacitor to connect the circuit to my solenoid. However, after charging the capacitor, nothing seems to...

What is the pattern made of balls? https://www.youtube.com/watch?v=KrUhKQxOPx0 I have some hypotesis: Something related to the CCD, a diffraction pattern caused by some dirt on the lens, or, but i think it's absurd, the Bravais lattice of the lens? I'm very curious!

Problem concerning zoom lens in camera... This problem deals with a diverging lens placed to the right of a converging lens. The converging lens has a focal length of 12cm and the diverging lens has a focal length of -12cm. The lenses are separated by 4cm. a) For a distant object, where is...

When I point a camera at the sky and use the flash, it brightens up all the stars I'm looking at (not just the ones on the screen). Does anybody know why this is?

I'm looking for a small camera to use in my rocket. It's about a 7' rocket, 4" diameter and 3" long viewing window. I've heard that the choices are either cmos or ccd but I don't know the difference between the two. I'm only looking to spend up to $100 (really looking in the $50 range). Any...

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

Is there any user on this forum who have used the SAXSess? please reply to this post. I need some discussion.

That question comes up every now and then. So maybe it's an idea to unanswer that here in this thread. So you want to be able to make those nice pics you see in the nature books, commercials etc. Obviously you need good equipment for that. The first essential thing is brain, the most...

I have 2 rechargeable 18v battery pack from cordless drill which I'm thinking of using as laptop charger and compact camera battery charger. These packs comes with 220v adaptor. Me and my 12yo son will be doing a week-long research for his school project (climate change) this Xmas break...

Camera "clicker" I need to take a picture every 5-60 seconds for about 2.5 hours. The problem is, I won't be near my camera when I do that. I want to make something to attach to the "clicker" or whatever it's called on the camera that will click it about that often. The button definitely...

Which one is a more accurate representation of the image? (i.e. what we see with our own eye) I've read that camera's actually flatten out the 3d image, but I have no clue what the consequence of this would be, while I do know that mirrors flip the image but I think that's the only thing that...

stole memory card from my camera?? I've been working tech support at a conference all weekend. I went to use my camera this morning and found the SD card missing. I know that, when I took 50 pix the day before the conference, the card was in there (I would not have been able to take pix...

Google claims it was totally inadvertent that they collected wi fi data using their street view camera vehicles. Personally I can't bring myself to believe that. http://www.pcmag.com/article2/0,2817,2363835,00.asp This was first revealed May but for some reason is just now hitting the...

Hey what's up. How much will be the price of a Thermographic camera, I am thinking in doing something like spy operations(yeah i know I am kinda crazy bla bla). Also what's the name of the technology that let you see trough walls? it is infrared?

I'm thinking of using the Kodak DCS 520 I inherited. It's still in the original box and never been opened. Has anyone used it or something similar? How dificult is it to use? I'm a bit camera phobic. It's old in terms of digital cameras, but it's just sitting there and I'd like to take...

Hi, I'm after a digital camera. Doesn't have to be too special beyond a) a high resolution (12MP minimum) and b) reliable and likely to last a while. I'm looking into this - Olympus Stylus Tough 8010 14 Megapixel Digital Camera - Silver 5X Optical Zoom - 2.7 LCD Touch Display - Waterproof -...

Homework Statement my textbook material on vidicon television camera is inadequate and i would like to know some web links from revered members which could provide some exhaustive coverage of vidicon. could members provide the link? Homework Equations The Attempt at a Solution

Hi everyone, I want to find a mathematical relationship between my head direction and the direction of a camera placed at a distance. The objective is to make the camera heading to same point where my head is looking at. Both my head and the camera are in the horizontal plane and the motion...

Hi, I'm trying to find a high resolution ccd camera that can be used to take PHOTOGRAPHS to inspect the surfaces of metal cavities. It has to be compact and oblong to fit into a tube so it can be inserted into a cavity. I'm looking for something very much similar to this shape...