Tagged Questions

Camera is a device that records and stores images.

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0
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0answers
13 views

calculating frequency spectrum using fft for video

How to process video with DFT/FFT - getting the frequency using PCO camera in c#,and how to interlink video frames with frequency transform.
0
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0answers
40 views

Detect laser beam and on/off pulses using camera

I'm trying to detect blinks of laser via vision. The laser blinks at 11.99Hz and the camera is taking in frames at 24 fps. As far as the Nyquist rate(the sampling theorem) is concerned, the supposed ...
-1
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1answer
56 views

Image processing and Camera Calibration

I have several related questions about camera resolutions. If I calibrate my camera to a particular resolution say 640x360, can I use it for another resolution like 1024x768? Also, I want to know as ...
1
vote
1answer
34 views

How to unify the color and brightness measure of two given camera?

I have two cameras, and I'm up to perform some matching stuff on videos captured by these two cameras since I'm a CV guy. The problem is the two cameras have very different performance in terms of ...
3
votes
1answer
321 views

AutoExposure with nonlinear camera: Non linear proportional PID?

Now I', wondering how to best implement a control algorithm for it. I tried using a PID controler but started with a simple P-control first. The problem is, that when using the equation ...
2
votes
1answer
98 views

Histogram evaluation for image quality concerning illumination

I'm currently trying to develop an algorithm to control the camera characteristic of a camera (the camera characteristic can be controlled to adopt it to the different lightning situation which can ...
0
votes
1answer
72 views

camera motion detection

I am working on camera motion detection.How do I decouple translation and rotation? I have obtained rotation by using sensors. I understand we can do something as simple as X'=RX+T , where R-rotation, ...
4
votes
1answer
47 views

Is gamma correction applied in my setup

I am working on a scientific application where I would like to evaluate luminance in an image, however I am unsure if what I receive from my setup is luminance (Y) or luma (Y'). I use a camera with a ...
3
votes
1answer
152 views

Are there characteristics of photographic film that would make it an analog medium?

There was an article a few years ago entitled "Analog is Not the Opposite of Digital". Film is not analog, period. I used to shoot film on a Canon AE-1 from the ’70s. Now I have a digital SLR from ...
8
votes
2answers
914 views

How does resizing an image affect the intrinsic camera matrix?

I have a camera matrix (I know both intrinsic and extrinsic parameters) known for image of size HxW. (I use this matrix for some calculations I need). I want to use a smaller image, say: ...
4
votes
1answer
644 views

FPS to Hertz in a camera

Not sure if this is the proper place to ask this, but I'm sure someone here will know the answer. I have this optical camera (TrackIR 4), which, for what you can see on the table, samples images at a ...
3
votes
2answers
231 views

Where to get the Kodak PhotoCD raw image dataset?

I've been doing some background reading on demosaicing raw images. I've seen the Kodak PhotoCD raw image dataset mentioned in a few papers on demosaicing: Image Demosaicing: A Systematic Survey High ...
2
votes
2answers
100 views

Colors on photo to real-life values

The target is to get a color of selected area from taken photo on a mobile device. So I've needed to make some image processing programmatically. Is it exist any algorithm to approximate color to it's ...
4
votes
2answers
282 views

3CCD or monochrome with Bayer filter?

I was wondering if any one with experience with both sensors can give some insight on this. I've heard there can be problems with alignment of the different signals using a 3CCD. However, when using ...
7
votes
3answers
881 views

Camera calibration/pin hole camera model and working out 3d position

I have a calibrated camera and have the intrinsic parameters. I also have the extrinsic parameters relative to a point (the world origin) on a planar surface in the real world. This point I have set ...
7
votes
2answers
4k views

How do I get the most accurate camera calibration?

First off, I hope this is the correct Stack Exchange board. My apologies if it is not. I am working on something that requires me to calibrate the camera. I have successfully implemented the code to ...
2
votes
1answer
68 views

Given some parameters, how do you determine how much of an image sensor an object will consume? [closed]

If I have the details of a scene and a camera, how can I tell how much of my camera's image sensor will be taken by a certain object in space? For example, if I have a painting that is 1m by 1m, it ...
13
votes
1answer
193 views

How do I determine whether I have pattern-free noise?

For microscopy, we're frequently testing cameras. Since my applications involve very low signal-to-noise ratio, it becomes important that the noise is free of correlations and patterns, because local ...