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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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How to get camera transform matrix from camera projection matrix?

Hi I have a camera projection matrix and I want to get the corresponding camera transform matrix. The projection matrix(P) is 3*4, which converts a 3D-point's homogeneous coordinate into a planar homogeneous coordinate. Now in my scenario, I can…
SolessChong
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Rectifying images on opencv with intrinsic and extrinsic parameters already found

I ran Bouguet's calibration toolbox (http://www.vision.caltech.edu/bouguetj/calib_doc/htmls/example.html) on Matlab and have the parameters from the calibration (intrinsic [focal lengths and principal point offsets] and extrinsic [rotation and…
David
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calling OpenCV calibration functions to calculate rotation vector and translation vector

I am developing an AR application on Android with Eclipse. I have the 4 corner coordinates of the marker which a virtual object must augment on it. My question is how can I call an OpenCV calibration function to calculate the camera's extrinsic…
saeede
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n camera calibration using opencv

I am building a 3D tracking system that uses up to 12 cameras. I understand the OpenCV function StereoCalibrate can find the relative position and orientation of two cameras. I need to do this for 12 cameras. Is there a OpenCV function or available…
andre
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Translation between two cameras

I have two cameras with R1,T1 and R2,T2 rotation and translation matrices calibrated w.r.t checkerboard coordinate system. My questions: Which point on checkerboard is assumed to be the coordinate system, maybe the center? How can I find the…
Razmik Avetisyan
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Understanding camera capture rate using opencv

This is probably an open-ended question. I have written an opencv application that captures feed from two external cameras connected to the computer. The capture from both the cameras runs parallely on 2 different threads. This recorder module…
Hrishikesh_Pardeshi
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Find radius of a ball using camera calibration data

A quick question, I'm using the Circle Hough Transform to detect balls in an image. Since the algorithm is computationally expensive, I've been wondering if it is possible to calculate the radius of the ball in pixels using camera calibration data.…
Adam
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3D Reconstruction upto real scale

I am working on a project to detect the 3D location of the object. I have two cameras set up at two corners of the room and I have obtained the Fundamental matrix between them. These cameras are internally calibrated. My images are 2592 X 1944 K =…
amoghesturi
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Finding right point matches using RANSAC

I have 2 images. Each has 8 points from the corners of two squares in each image. I need to find the corresponding correct matches between them. So, when I pass the 64 possible combinations of matches into RANSAC (findFundamentalMatrix), it gave me…
amoghesturi
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OpenCV calibrateCamera - MSFT LifeCam 3000 HD

I am trying to use the OpenCV calibrateCamera function to calibrate my MSFT LifeCam 3000 HD webcam. In order to do that, I understand that need to know fx and fy (the focal lengths of both the x and y axes). However, I am having a tough time…
user1805103
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Consistency of projecting points onto an undistorted image

I want to project a point in 3D space into 2D image coordinates. I have the calibrated intrinsics and extrinsics of the camera I'm using. I have the camera matrix K and distortion coefficients D. However, I want the projected image coordinates to be…
Ashok
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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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RGBDToolKit calibrate correspondence cannot display the live view by my canon digital camera

Hi~ I am trying to calibrate my depth camera with my digital camera.. but I meet some problem using the RGBDKinectCapture... 1、why the calibrate correspondence cannot show the RGB view from my digital camera?? (canon EOS 600D) I have set it the live…
GanLiting
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Can we find Camera matrix, without running the calibration code?

I would like to know if it is possible to know the camera calibration matrix anyhow , just by knowing it's specifications , without using camera calibration???
Mojo Jojo
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How to project night sky into camera?

I want to write something like a virtual telescope that looks into the night sky. Till now I've a star catalog and I want to project them into a plane to get a mock picture. I speculate the projection to be a gnomonic projection, which can be found…
SolessChong
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