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Questions tagged [camera-calibration]

In Computer Vision, camera-calibration is the process of finding the true parameters of the camera that produced a given photograph or video. Usually, the camera parameters are represented in a 3 × 4 matrix called the camera matrix.

Usually we say a camera is calibrated when we know the Intrinsic Parameters.

Source: Wikipedia

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Universal camera control for multi platforms

I need to adjust the parameters of the camera like 1) brightness 2) contrast 3) Hue etc., as show in the below window. I need to do it for Windows and Linux environments. Can some one give me tips on where to start. On googling I could found only…
2vision2
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CameraCalibration with Open CV

I try to calibrate a camera with python and opnecv. I use a video-file instead of a webcam live stream. Everything seems to work except of the last step. This is: print "now get ready, camera is switching on" while(1): …
user2285696
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OpenCV: unable to get correct euler angles for calibration of single camera

I posted a few weeks ago because I was having trouble getting the correct translation vector in opencv with python when I was calibrating my camera (Python Opencv SolvePnP yields wrong translation vector) Though, that was solved, I am not having…
amartin7211
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outputs parameters of cvCalibrateCamera

I'm using OpenCV calibrateCamera function to extract intrinsic end extrinsic parameters of my camera. I have a big problem with the extrinsic one (rotation and translation) because the rotation matrix, that should be a 3x3 matrix, it's only a 3x1.…
tiavec88
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Camera Calibration (cv.calibrateCamera and cv.InitUndistortMap)

The cv.InitUndistortMap opencv function is not working. I get the intrinsic and distortion matrix, but I can not use this values to fix my image. I get this error: cv.InitUndistortMap(camera_matrix,distortion_coefs,mapx,mapy) TypeError: Argument…
Andrea Diaz
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Disable camera focus on startup

When I start the camera on my iPad 3 with iOS 6 the camera does a focus operation. This is how I am doing it with AVFoundation framework:\ // // AppDelegate.h // @interface AppDelegate : UIResponder @property (strong,…
MobileCushion
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unresolved external symbol cvFindChessboardCorners()

I've included the header files that cvFindChessboardCorners() is declared in and a bunch of others but it still doesn't work. How do a define the symbol? Not sure what is going on here? Let me know if more information is required. Thanks.
YahooMania
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Mechanical calibration and finetuning of stereo webcams

There are many reads regarding stereo (computer) vision. The most notable message to take away from these reads is that you are pretty much stuck with OpenCV... which is definitely not a bad thing. Most articles are about calibrating through the…
ChrisDekker
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Calibration Opencv

I am trying to find camera extrinsics from six chessboard images with Opencv. My output is: 86
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1.7261576010447846e-01 3.1158880577193560e-01…
Paul
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Issue with cvReprojectImageTo3D and CV_32FC3

I need your help. I have implemented stereo calibration, rectification using my stereo pair. I have got a disparity image which is quite reasonable. The problem that I face is with cvReprojectImageTo3D.I have used stereobM. And rectified in a…
nbsrujan
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Stereo Camera-extrinsic matrix

I have calibrated stereo cameras and got the extrinsic matrix. I know the Translation Vector 'T' between co-ordinate systems of the first and second camera. T: [ -35.831, 36.364,18.837] How can I calculate the base line distance between the…
MMH
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access violation while stereo calibration?

Iam getting access violation error while I am performing debugging in stereo calibration code is as follows for(int j=0;j
nbsrujan
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web cam calibrate

I have 2 logistic webcam, I want to do stereo triangulation for which I have to measure the focal length of 2 web cameras. My question is if I use openCv to calibrate the camera and generate the intrinsic and extrinsic matrices can I use the focal…
MMH
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Calling opencv through Emgucv

I'm trying to use Emgucv in c# to decompose a projection matrix into a rotation matrix, a translation matrix and a camera matrix. I could easily do it with RQ-Factorization but I couldn't find it by inspecting Emgucv API reference. Since Emgucv is a…
Bruna
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Converting 2D world coordinate to camera coordinate to pixel coordinate

I have a world coordinate in 2D(x,y) and I want to convert it to camera coordinate and then to pixel coordinate. Any help would be great appreciated.
Peter Ngimbwa
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