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Questions tagged [webcam]

A webcam is a camera specialized for low-resolution images or Video. They usually have to be connected to a computer to work.

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1answer
147 views

How do I calculate how high a camera needs to be to fit an object in the frame based on its field of view?

I'm doing a computer vision application related to snooker for my dissertation. In a section of my report, I’m talking about cameras and it would be good if I’m able to do the calculation stated above....
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1answer
705 views

Using a camera as Lux-meter

For a project I want to use a USB-camera (https://www.e-consystems.com/ar0330-lowlight-usb-cameraboard.asp) as a Lux-meter. I control the camera using v4l2 on Linux. I have a real lux-meter (https://...
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2answers
197 views

What is causing this ghostly image of a circuit board to appear in images from my webcam?

I am the owner of a Logitech c930e webcam. This morning I turned it on and the images looked like it was a PCB printed on the sensor. So I am here asking to anyone that know something about this ...
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2answers
138 views

Why do color channels from a digital camera respond slightly to lights of other colors?

I'm trying high speed dark room photography with Logitec c270 simple CMOS web camera. I flash red or blue light and capture frames. Then I separate it to channels in photoshop. There, I can see all ...
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3answers
143 views

Automated time-lapse photo gear

I've been tasked (as the "techie" for a non-profit) with devising a system to take time-lapse photos of a house our foundation is building for charity. I have toyed with hooking up a raspberry pi ...
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1answer
248 views

Strange image artefacts from PS3 Eye camera

I am using PS3 Eye camera (model 5SLEH-00448) to take photos with OpenCV (C++) on Rapsberry Pi. It runs via v4l2 driver that only supports YUYV uncompressed capture mode. I save the images as PNG. I ...
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1answer
131 views

Numerical Aperture of an Inverted Webcam Lens

I have inverted the lens on a webcam to create a webcam microscope. For illumination , I am using an led array. For the project that I am doing I need to know what the NA of the lens, but I am ...
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1answer
246 views

What settings should I use on a webcam to get accurate light intensity measurements?

I hope I am not in the wrong place to ask this kind of question since it is more about image acquisition than photography. I have to use a Microsoft Lifecam HD webcam to take snapshots of a laser ...
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2answers
649 views

Modify webcam optics increasing magnification

Currently using a throwaway webcam to view backyard bird activity connected to a Raspberry PI3 using MotionEyeOS. The RPI3 is outside, as is the camera. Question is... Is there a simple/cheap means ...
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161 views

Does focal length affect coordinate estimation?

I am using a webcam mounted on the ceiling to track some markers. I measured the area on the ground that the webcam is able to see, it is roughly 2.61m x 1.46m. The output of the coordinates right in ...
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1answer
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How can I set up a Canon EOS camera to be a webcam?

I have a Canon EOS camera. I'm accessing a website that wants to access the camera connected to my computer. Even though my Canon EOS is connected, it wasn't detected by the browser. How do I enable ...
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2answers
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How can I know the focal length and sensor size of my webcam?

I have this webcam: QHM495LM WEB CAMERA and I need to know its focal length and its sensor size, but in the specs of the webcam, it only gives me this information: • Inbuilt sensitive microphone and ...
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3answers
4k views

What type of lens can I add to my webcam for closeups 5-20cm away?

I have a somewhat unusual need - I've got a webcam with a fixed, plastic lens that's focused on anything >40cm away. I need to be able to focus on things that are 5-20cm away. I'm not worried about ...
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801 views

Why is there no image noise in my webcam dark frame photographs?

I'm trying to take some timelapse photos with a webcam. To reduce noise, I'm trying to take a dark frame. However, with the lens covered up totally, there is absolutely no noise in the image. The ...
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4k views

Can I modify a Logitech C615 webcam for infinity focus?

I've been using the Logitech C615 web cam for some time now, for timelapse photography. However I'm not perfectly happy with its focus at "infinity". It's not perfectly clear. On closer distances the ...
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1answer
344 views

Camera that works like a webcam to take transfer images to a computer (but faster) [closed]

I am a software developer and I want to have picture taking in my app, but web cameras are too slow and when they are held for a picture the image is blurred. First, is the the correct place to ask a ...
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1answer
1k views

How to know the F-Stop in a Webcam? [closed]

I'm looking for a Webcam with large aperture and shallow depth of field, similar to the F 1.8 Canon lenses, so far It has been really difficult since most of the specifications for any webcam are ...
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3answers
387 views

Webcam effect for Canon 5D Mark II

Is there any lens for a Canon 5D Mark II that can give the effect of a webcam? For webcam effect I mean: the subject can stay relatively close to the lens without barrel distortion large depth of ...
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2answers
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Why are some webcam lenses “recessed”?

I'm used to seeing webcam lenses that look a bit like this: But recently, I noticed that there are several webcams (especially Microsoft ones) that have some sort of "concentric recesses" around the ...
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1answer
924 views

What's the difference between taking long exposure camera shot and recording video on webcam for the same time?

What's the difference between long exposure where the shutter(on real cameras) is open for a certain period of time, and recording of a video on a webcam for that same time? Isn't the sensor exposed ...
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3answers
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What camera equipment do I need for deep space photography?

I have a Skywatcher-127 telescope and would like to take some deep space images e.g. globular clusters etc. I have had recommendations about what webcam to use for planetary photography but not deep ...
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How can I modify a webcam to use an SLR lens?

I want to place a webcam between 6m (20ft) and 12m (40ft) from my subject and have a capture width of 3m (10ft). If I understand the formula, with an estimated sensor width of 8.46mm (1/3"), I need a ...
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1answer
2k views

How can I take long exposure photos with a webcam?

I have a very simple webcam made by A4tech. It already has an exposure function (in its settings) and it's good in low light. I want to be able to take even longer exposures. I have found this but I'...
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1answer
693 views

Is there a resource showing Mechanical vs. Non-Mechanical shutter cameras?

I am looking for digital cameras to use for a webcam project. After learning first-hand about shutter-actuation limits I am now looking for some sort of reference that shows what cameras have ...
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3answers
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Is there a webcam that can focus to infinity, for time-lapse landscapes?

Does anyone here know of a webcam (at least 720p) that has the ability to focus to infinity? At least one webcam I know of (Logitech C910) doesn't allow that. I would like to use it for time lapse ...