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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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Doubts in camera calibration

I am working on a project based on machine vision . Wide angle lens with high resolution pinhole camera is being used. Working distance : Distance between Camera and object . The resolution will be nearly 10MP. The image size may be 3656 pixel…
dip
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How can I transform an image using matrices R and T (extrinsic parameters matrices) in opencv?

I have a rotation-translation matrix [R T] (3x4). Is there a function in opencv that performs the rotation-translation described by [R T]?
Carlo Pane
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Camera homography

I am learning camera matrix stuff. I already known that I can get the homography of the camera (3*3 matrix) by using four points in a plane in object space. I want to know if we can get the homagraphy with four points not in a plane? If yes, how can…
user1732692
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Open CV - Several Methods for SfM

I got a task: We have a system working where a camera does a halfcircle around a human head. We know the camera matrix and the rotation/translation of every frame. (Distortion and more... but I want first to work without these parameters) My task…
Terra Drept
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Camera calibration (OpenCV 2.3) - how to use the distortion parameters?

I have a set of images of a rigid body with some attached markers. I defined a coordinate system with origin in one of these markers and I want to get the rotation and translation between this coordinate system and the one defined at the camera's…
pn_
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what is new camera matrix in cvundistortpoints.?

I am facing a problem in understanding what the new camera matrix in cvUndistortpoints. We get a camera matrix of camera in stereocalibration itself and why we have to pass a new cameramatrix in cvstereorectify which we obtain from…
nbsrujan
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In a calibrated stereo-vision rig, how does one obtain the "camera matrices" needed for implementing a 3D triangulation algorithm?

I am trying to implement the (relatively simple) linear homogeneous (DLT) 3D triangulation method from Hartley & Zisserman's "Multiple View Geometry" (sec 12.2), with the aim of implementing their full, "optimal algorithm" in the future. Right now,…
neuviemeporte
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OpenCV 2.3 camera calibration

I'm trying to use OpenCV 2.3 python bindings to calibrate a camera. I've used the data below in matlab and the calibration worked, but I can't seem to get it to work in OpenCV. The camera matrix I setup as an initial guess is very close to the…
hokiebird
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Camera Calibration - Rational Distortion Model

I was looking into the OpenCV 2.2 function cameraCalibration(...) and I noticed a flag CV_CALIB_RATIONAL_MODEL that enables a new radial distortion model supposed to work better with wide-angle lenses: Where is this model coming from exactly? I…
memecs
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I'm not able to get OpenCVs pose reconstruction to work

I'm currently trying to reconstruct camera poses using OpenCV. For the implementation, I'm roughly following the Epipolar Geometry Example. The idea is the following: load two pictures and compute their SURF features using…
RobinW
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How do you calculate spherical camera position from point correspondence?

I have 4 points marked in an equirectangular image. [Red dots] I also have the 4 corresponding points marked in an overhead image [ Red dots ] How do I calculate where on the overhead image the camera was positioned? So far I see there are 4 rays…
nickponline
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Distortion correction with open CV

I am trying to correct image distortion with open CV. The theory for the distortion I am trying to correct is a combined barrel and pincushion distortion like this: I am not working with a normal camera here, but with a galvanometer scanning system…
user3696412
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How can I transform coordinate between two cameras using openCV?

I have two intel realsense cameras: CameraLeft and CameraRight .I'm trying to find the rotation matrix and transformation vector between these two cameras, so I can transform coordinate system between two cameras. Here is what I have tried: 1.I use…
FrankYu
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Camera Orientation Estimation

I want to estimate the orientation angles of a moving camera. I have the camera intrinsics K and can track keypoints to calculate the essential matrix E and from there on also the rotational matrix R with respect to the previous frame of the…
Alexander Riedel
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HALCON to OpenCV Distortion Coefficients Convertion

I have got a calibrated multi-camera system. Both the internal (focal length, distortion, etc) and external (poses) camera parameters have been estimated using HALCON-based program. Now, the goal is to write a C++ program, to read the camera…
N.R.
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