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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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Unexpected results using camera pause functions of opencv

I am using Opencv with python 2.7. I have obtained intrinsic camera matrix, and extrinsic matrix of the camera pause, with a chess board : (ret, mtx, dist, rvecs, tvecs) = cv2.calibrateCamera(objpoints, imgpoints,…
MikeTeX
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Function parameter calibrations by means machine learning

I have a function F, [bool] = F(DATASET, tresh1, tresh2), that take input a DATASET and some parameters, for exasemple 2 treshold value -tresh1 e tresh2-, and returns a boolean: 1 if DATASET is "good", 0 otherwise. The answer depends on the values…
Giorgio
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How to get focal length of virtual pinhole camera in opengl

I have created a virtual dataset in OpenGL, so that I can get exact camera coordinates in relation to my target scene. I am running tests on stereo vision with two viewpoints of my scene, and trying to confirm that my epipoles are correct. However I…
Grim
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Detection of chessboard-like pattern in OpenCV

I have a problem with detection of chessboard-like pattern. The image is very noisy because it is registered with the use of laser scanner. The only thing I have managed to achieve is detection of big rectangle: Now I have no idea how to detect…
Dokotor
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How to calibrate the Kinect camera?

Camera calibration is the process of estimating intrinsic and/or extrinsic parameters. Intrinsic parameters deal with the camera's internal characteristics, such as, its focal length, skew, distortion, and image center. Extrinsic parameters…
Thulio Amorim
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Strange magnetometer readout

I am attempting to readout the data from my MPU-9150 magnetometer and getting some odd numbers. I have accessed the magnetometer within the IMU and am getting data which changes with the orientation of the IMU but is not within the range specified…
Alexander Lock-Achilleos
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What are typical size/values for Camera Matrix and Distortion Coefficients for camera calibration in opencv 3.0

When trying to use StereoCalibrate, StereoRectify, and initUndistortRectifyMap in opencv 3.0, I get runtime errors that reference size, and is labeled "Assertion failed". I believe this must be due to my Camera Matrix and Distortion Coefficients.…
Rowan Lumb
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How to calculate the object size in pixels from its distance

I am designing a system to capture images of a specific object (with specific dimensions) from different distances in a way they have specific sizes in pixel. I am looking for a solution which gives me the distance if I give it the object size in…
ard24ie
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error:camera calibration with openCV

I'm trying to calibrate my camera but I have some errors. When I try to compile the program in opencv/samples/calib3d.cpp, CodeBlocks tells me that I have errors in calib3d.hpp. I did some research and I find the probleem is in #define…
avatar12
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Calibration of a soundcard in MATLAB

I have designed a GUI to calibrate my sound card using MATLAB, I am able to record my input signal. I would like to calibrate my input. How do I do that? My GUI should be capable to adapt to different sound cards and get the dBV values, hence the…
Aditya
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Generalized additive models for calibration

I work on calibration of probabilities. I'm using a probability mapping approach called generalized additive models. The algorithm I wrote is: probMapping = function(x, y, datax, datay) { if(length(x) < length(y))stop("train smaller than…
user4847048
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calibration of the posterior probabilities

currently i work on calibration of probability. i use the calibration approach, called rescaling algorithm - the source http://lem.cnrs.fr/Portals/2/actus/DP_201106.pdf (page 7). the algorithm i wrote is: rescaling_fun = function(x, y, z) { …
user4847048
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How can I install "calibration" function from the sklearn package?

I'm get the following error when using calibration: from sklearn.calibration import CalibratedClassifierCV clf_sigmoid = CalibratedClassifierCV(clf, cv=2, method='sigmoid') ImportError: No module named calibration calibration by default is not in…
user3779542
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Need to calibrate DHT11 humidity sensor on a Raspberry Pi B512 for accuracy

We're running an old Raspberry Pi B512 with a DHT11 humidity sensor on an i2c. Although the DHT11 claims the accuracy is +/-2C for the temperature and +/-5% for humidity, we're seeing more inaccurate readings. Does anyone know how to calibrate…
ProfRose
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How to get around flat likelihood function when calibrating GBM parameters

I want to calibrate jointly the drift mu and volatility sigma of a geometric brownian motion, log(S_t) = log(S_{t-1}) + (mu - 0.5*sigma^2)*Deltat + sigma*sqrt(Deltat)*Z_t where Z_t is a standard normally distributed random variable, and am…
Futurist
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