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Questions tagged [calibration]

Use this tag for questions related to the process of adjusting the output or indication on a measurement instrument.

443 questions
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I writre freenect_camera_to_world myself, but

I use opencv and openNi to calibrate the kinect and my HD camera,with the method in RGBDCaptureKinect, It use the freenect_camera_to_world to the origin code: // camera -> world coordinate helper function void…
GanLiting
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Finding camera and distortion matrix usinc cvCalibrateCamera2( )

I was trying to find out the camera matrix and distortion coefficients using cvCalibrateCamera2. There were no compilation errors, but when I am trying to execute the program it gives: OpenCV error: Sizes of input arguments do not match( both…
Mojo Jojo
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Stereo Calibration and 3d Reconstruction

the result of 3d reprojection function is a matrix that has X,Y,Z of each pixel. let's take the first element of this matrix points[0] which has: X= 414.580017 Y= -85.03029 Z= 10000.0 what is the unit here and where I can find this pixel in the…
user2335610
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Stereo rig Calibration using two webcameras with autofocus technology

DISCLAIMER: Apologies for this very large question, as it could take a lot of your time. I have a stereo setup consisting of two webcams these cameras possess auto-focus technology. The stereo setup is in canonical configuration where the cameras…
Richie
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Shimmer device X Y Z Axis

I am conducting an experiment regarding the detection of movement using a shimmer device (X, Y, Z axis). If the person is lying on the ground, is this the X, Y or Z axis?
user2321845
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OpenCV calibration Code

Well, this is my attempt at calibration for the iPhone 5. It sucks, and I don't know why. It appears to be finding the corners appropriately, and yes 27 images to calibrate. The results are cubist reinterperetations of chess boards. Can anyone help…
justagruvn
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Questions about using NLS.LM in the minpack.lm package

I am trying to use the minpack.lm package in R. Specifically the NLS.LM function. I'm pouring through the manual and help files, but the requirements for setting it up are a little beyond my current capabilities. Any guidance is greatly…
traggatmot
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finding speed of device movement

I need to find velocity of a device(Samsung Galaxy s3). I've now read quite a lot of stackoverflow questions concerning it, but still confused as for what I should use. My observations so far: 1) Somebody did this to find velocity from accelerometer…
Nazerke
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camera calibration sample code (bigmat matrix)

I'm looking at camera calibration sample code in opencv. Now, I'm troubling with understanding some lines of the code. This code is in the sample code folder in Opencv 2.4.3. My question is about C++ rather than opencv. Here is the sample code in…
user2131811
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How to automatically calibrate axes in MATLAB?

So I am doing some ECG analysis in MATLAB and so far I have detected the key features as shown in the figure below : This is the ground truth : So how do i replot the first figure such that the x axis ranges from 0 to 10 (as shown in the second…
Has
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Any Windows based colorimeters with a public API

I have access to a colour changing lightbulb system (Philips Hue). Because the light does not use RGB LEDs internally, it's hard to predict the colour you will get out of the light when you use the API. I'd like to measure the colour of the light in…
Max Palmer
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How do I calibrate RGB Image with Depth Image taken using Kinect (X-box)?

I need to map Depth Image that I got from Kinect (X-box) to RGB image (taken from kinect). The problem is that the depth image size is different from that of the RGB image. And I want to calibrate these images and get their pixels. How do I…
Kainat
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Using value before and after to analyze desired value::: Radiometric Calibration - Streaking

Let's say I have a data table that is 1x15 [21 78 33 59 90 26 88 54 36 63 72 37 48 93 56] So for my streaking equation I need to implement this: % Streaking = {[abs(Q_n - ((Q_n-1 + Q_n+1)/2))] / ((Q_n-1 + Q_n+1)/2)))}*100 Explanation of the…
Ben B.
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Determine projector focal length

I am trying to run the cvPOSIT algorithm to map points that are projected using an Optoma PK301 with a the Kinect's depth camera. I have already determined the intrinsic parameters of the projector by calibrating it using the Projector-Camera…
user1076455
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Manipulator/camera calibration issue (linear algebra oriented)

I'm working on a research project involving a microscope (with a camera connected to the view port; the video feed is streamed to an application we're developing) and a manipulator arm. The microscope and manipulator arm are both controlled by a…
DivideByZer0
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