Camera Definition and 299 Threads

Hello, We have a thermal camera and its purpose is to detect hot spots at different distances. We made an experiment with a JPEG picture and we noticed the following: At the same distance, one object at 600 degrees and an object at 38 degrees (human body) have the same pixel intensity (255 in...

I'm developing an off-axis digital holographic camera. Initially, I employed a CCD camera with 6.7-micrometer pixels and successfully observed the first-order interference pattern in the Fourier domain. However, when I switched to a CCD camera with smaller pixels (1.67 micrometers), the...

I entered a CD to my Blu-Ray and the camera's light (signaling if it's on or off) was sent on, and it seems I can't turn it off with the on/off button. Unless of course I disconnect it from the PC. It's a simple GPlus camera, I guess made from china.... :oldbiggrin:

This thread is for documenting the setup of my new telescope. It's not completely new, I'll be using some peripherals from the old telescope, such as the camera, filter wheel, off-axis guider (OAG), mini PC, focuser, etc. But the optical tube assembly (OTA), mount and tripod are new. Also new...

Answer from the book: We need to draw two diagrams, one assuming the photo on p. 644 is right side up, and another assuming it is upside down. Figure 23–9 is drawn assuming the photo is upside down. In this case, the Sun blocked by the tree would be the direct view, and the full view of the Sun...

Should any Android apps be given access to its( Android) camera? Re a blackmailing email I recently received, I want to cover as many security angles as possible. So I recently checked the list of apps in my Android that have access to my camera. There were a few, WhatsApp and Google being...

I found two martial arts papers that used just one camera to analyze movements and the rest of the papers that I viewed either used MOVEN sensors plus software or more than one camera plus triangularization. I would like to use just one camera in conjunction with Kinovea software but I don't...

Is it possible to create a lens that expands a narrow range within the visible light spectrum to represent it using full visible spectrum?

I know there are some stationary 3d scanners like this, but they are really expensive. When I saw, well an addition to handheld 3d scanner - a robotic hand, I came up with an Idea that same can be done with a simple camera, and photogrammetry. Found a nice article about photogrammetry on the...

Hello, I was wondering what parameters determine the angle of coverage/size of the image circle of a lens. For example, for a fixed focal length, aperture and flange focal distance of a camera, what can a lens designer do to change the size of the image circle. I'd also like to know how the...

Hi all, I will like to simulate diffracted spots at least two spots, on a camera. I will be glad if someone can help out with a code. below are the details required: camera pixel size = 4um (each pixel can be sub divided for better calculation), gap size = 100nm, camera length = 4000 x 4000...

How can I subtract the camera noise from my real image? Basically, I want to calculate the center of gravity of a diffracted spot without the influence of my camera noise. I will be glad to know how this can be done.

Considering that all the tips of youtube does not working for a modern camera... because no visible light, very very small size, the camera of other phone to does not work... what its the best form for this case? I am very intrigued, it would be like finding a needle in a haystack (sorry my...

I have a pixel 3xl. The normal camera broke this weekend, but the selfie camera still works. I have an app that I need to scan a qr code once a day for work that only attempts to use the now broken camera. If I could get it to use the selfie camera getting it to line up would be a little...

I figured out that the pressure is 8.0442x10^7 Pa and I’m not sure how to approach the second half of the question. I’m thinking I use the formula F=PA but I’m realizing it’s not saying that .15m is a diameter or a radius.

Dear All, I'm a french professional photographer working on Still Life and Architecture. As a long time and personnal project I'm working on a 3D printed/Laser cut analog camera that will shoot 6x4.5 frames. In the end it will be some kind of rangefinder with integrated electronic light...

Looking for input on whether I've bought a lemon or if I just need some finesse. For a lark, I bought this 1.25" eyepiece compatible webcam for my scope. I had low expectations but knew I could only find out by trying it. https://www.amazon.com/gp/product/B08DP1YZP8/?tag=pfamazon01-20 First...

I do not have the education to grasp the math of quantum mechanics but I am very interested in it and understand some of the concepts. I often find myself pondering those concepts. One thing I began to wonder about was the possibility of using quantum entanglement to observe distant objects so...

Lets imagine that I will put the recording camera and ticking clock into a box and so that camera can record this clock all the time ticking. I will put then this box to the speed of 1/2 speed of the light, after a minute of mine I would stop this box and take the camera from it. As it was at...

Background: This fall our initial plan will have high school students on campus 1 day per week and working remotely for the remainder of the week. I'm trying to plan for some at-home labs and projects. I came across http://albedodreams.info/how_to/how-to-calculate-albedo-yourself/ site which...

I have a small point-and-shoot camera, Canon Powershot A560, that's getting a bit long in the tooth. It doesn't seem to want to store the date and time any longer, despite taking the batteries out and putting them back in (I use the NiCad batteries designed for cameras, which last longer), and...

A radiation-shielded go-pro camera was sent through an electron beam irradiator. You can see the effects that the radiation has on the camera in the video. I wonder how many rads it was exposed to.

There will be a solar eclipse on 26th December that can be viewed from my city. In addition to buying safety glasses, I also want to prepare my camera, if possible. The camera is a Panasonic FZ-70. I have a UV protector and four ND filters - 2, 4, 8, 16. I am also buying a circular polarizer...

This problem arose in modeling camera focusing movement, such as a control system might do. It assumes a simple (thin) lens, rays close to the optical axis, and monochromatic light. While most camera lenses are not simple, this is a first approximation. Camera lenses project an image of a...

Hi all, My first post on this forum. I couldn’t think of anywhere better to come than to here with a question I’ve had since a recent trip to Chernobyl! Whilst visiting Pripyat I took several videos. Great care was taken to stay away from any contamination hot spots and we had an experienced...

I have no previous experience using this tool. My question is if some of you have any comment about this tool or any option for image processing using similar cards such as arduino, etc.

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I tried to mess around with some equations in Mathematica with more or less success. Let's call ##a,b## the two sides and ##\delta## the angle between them. I contructed vectors that point to the corners of the room. ##\vec{a} = (0, 0)## ##\vec{b} =(a, 0)## ##\vec{c}=(a+b \cos{\delta}, b...

First of all, Let me present some of the things I found from research. (considering convex lens) Interpretation 1 => Focal length is the distance from the center of the lens to the point where all rays converge. Interpretation2 => Focal length is the distance from the point of convergence to...

Hello everyone, I am trying to build a 2-axis camera gimbal, which will control yaw and pitch. I have bought sensorless BLDC motors (GB280870KV) which I drive using SPWM. For knowing the camera orientation, I am using IMU sensors (accelerometer, gyroscope, and magnetometer) integrated on the...

Hello all! I just discovered PF as I have been searching about a project I have been pondering for a day. The idea is to have a device that I can set my 3lb camera and have the device rotate left-to-right && || right-to-left over the duration of 2 hours for use in a sunset/cloud timelapse...

(Sorry for Length) 1. Homework Statement You have decided to use a CCD camera to check if a 16th magnitude quasar is variable. You can presume that all of the light of your quasar falls on one pixel. You know that a star with a magnitude of 0 would deliver 1 × 10^9 photons/second to one pixel...

I am looking for an IR camera that can pick up 1550 nm IR light source on the pix level. I have silicon wafers and I am going to hit the pixels with a 1550 NM IR light source and I want to be able to see the pix with a IR cam. I want to connect it computer and use a C# application to view the...

Hello, I have a small project in which I try to use a Time of Flight camera to detect movement in the Field of View. Now the current Field of View is really narrow (about 25° diagonal FoV), which is we I will have to simulate a bigger one. My professor did try to explain to me what changes...

I just inherited an infrared camera (https://www.flir.com/products/c2/). Other than taking entertaining thermographs (cold ice cube in a warm hand, etc.), can you recommend some clever demonstrations I could show to my fellow calc-based physics students? The best I came up with is taking a...

I read maxwell says electric field polarizes the dielectrics. Does it mean above effect used at photographic camera lens design to make that lens sometimes works like polarizer filter ? Mustafa Umut Sarac Istanbul

Hi. I need to know the name of the transparent glass which can display objects like Line, Circle, Numbers, or maybe my name. Thanks!

Hi I have a cheap smart phone with a low quality camera when I go to take a picture there is what I would describe as like old television static appearing in front of the image as it appears on the phone screen (although what is beyond it can still be seen). I am wondering if this is just dust...

I posted the following on a phone forum and got no replies, as expected. It's a bit out-of-the-way and technical. Thought this might be a better place since the question still interests me. I'm using my phone to take photos of assembly procedures on my electronics workbench. However, the focus...

Can you help me figure out how this light-based phenomenon works? Please explain with an intuitive answer using the simplest principles possible. Note how the location and width of the dark horizontal bands is constant with respect to the edge of the video frame. The LED light looks normal...

Could this be a possibility at some point? Since entanglement is not affected by distance, could we send cameras out to extremely distant places and get instantaneous signals? Only the image sensor would have to be entangled. It would still take the same amount of time as usual to get the camera...

What type of lens/prism would be needed to allow a image sensor to see 180 degrees, so the sensor could see a hemisphere. It doesn't matter if the input is distorted. I thought that a glass pyramid with a square base might work.

I am not sure if this is the best place to ask and I will change locations if need be, but I need some guidance on how to choose a proper sensor for my project. I am currently working as part of a team on a polarimetric camera for ocean imaging. The basic premise is that images, from above the...

I have a project which requires me to get 5 very specific images of an object from various angles. The user can't use their hands because it would be too shakey and introduce error. These images have to be precise and steady. So that's why I need to build a helper camera mounting device to help...

First I am not sure if this is the correct place to post this thread, but the thread will be about optics, quantum physics and special relativity, so it is a mixed subject. Please watch this video first: This technology allows capturing videos at mind blowing 1 trillion fps, which allows us...

Hey everyone, So, my school club was approached by a local entrepreneur that sends up cubesats as well as ping-pong ball sized "satellites." The original intent of these (what he likes to call) Pongsats was to get kids excited about STEM and space. He send them up for free via weather balloon...

Experiment / demonstration: Set up military surplus command tent as camera obscura / pinhole projector for observation of full soar eclipse. Problem: lacking in personal knowledge of the formula needed to determine correct focal length to hole diameter Solution: Request assistance from actual...

please refer some live feed drone camera with infrared and night vision and good picture clarity in minimum price . thank you

Hi. I am doing a project concerning getting a picture of the milky way, in a similar manner of the artists impressions artwork( I don't actually intend to try it obviously). As I don't have a clue what camera to use as an example becuase I need the FOV to work out how far it needs to travel...

i ve got an Arduino Uno R3 and the OV7670 camera module SD Module and a Wifi shield . ive done tweeting with arduino using twitter library http://playground.arduino.cc/Code/TwitterLibrary i was wondering Is there any library to post images in a tweet? or some other hack?