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Questions tagged [extrinsic-parameters]

45 questions
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Camera calibration for non-planar rig

Based on the results I got and the provided documentation I concluded that calibration using non-planar rig does not work in OpenCV (they are heavily dependent on the initial guess). According to their documentation of the function…
krips89
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OpenCV: Rotation Matrix and Translation Vector for a Moving Single Camers

I have a calibrated (intrinsic parameters) camera. Later, I need to use it for taking different photos from an object. They will be used to re-project some points of the images. A key step is to calculate Rotation matrix and Translation vector,…
Ali
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NeRF camera parameters from 2D face image data

I'm new in NeRF. I'm trying to make view synthesis using 2d face image dataset like FFHQ. I extracted camera pose as below from my trained model to get UV_postion map. 3.815960444873149338e-01 2.011289213814117585e-02 -2.146695841125471627e-01…
Hong-jik Kim
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Extrinsic Matrix from camera pose

I'm trying to compute the extrinsic matrix from the pose (position and orientation) of the camera given in world coordinates. I used the following to compute the extrinsic matrix, T = [R -Rt; 0 1] 3x4 Matrix The rotation(theta2) of the camera is…
Stark
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Calculate real world coordinates given camera intrisinc, extrinsic, trimesh

I am struggling to map pixel coordinates to world coordinates. From what i've found on google, apparently I have to use the camera intrinsic/extrinsic (I have them). Can you explain me how to use the rotation matrix & the translation vector to map…
Carlos
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Calculating the rotation and translation (external parameters) of multiple cameras relative to a single camera?

Given a set of 5 cameras positioned as shown in the image below which capture the top, front, rear, left and right views of an object placed in the center. Also given that the origin of the world coordinate is assumed to be the top view (therefore…
Hassan Zaidi
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Get the relative position of the camera with extrinsic parameter but z-axis not facing to the camera

Object: I'm trying to get the relative position of the two camera's with calibration. I'm using openCV to achieve this goal. criteria = (cv2.TERM_CRITERIA_EPS + cv2.TERM_CRITERIA_MAX_ITER, 30, 0.001) if ret == True: corners2 =…
slowmonk
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Projecting the vertices of a tennis court from 3D to 2D is not working

Background I've defined a tennis court with 3D points, and I'm trying to use OpenCV to project the 3D points as a 2D image. Below are the 3D points I'm using to define the tennis court. For reference: Left on the court is -X and Right is +X, Up is…
jjasper
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Camera's extrinsic matrix

I am trying to use MATLAB's camera calibrator to calibrate an infrared camera. I was able to get the intrinsic matrix by just feeding around 100 images to the calibrator. But I'm struggling with how to get the extrinsic matrix [R|t]. Because the…
sensationti
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Need help for pose estimation of an object using open cv c++

I have the intrinsic and distortion matrix from a calibrated camera. I am using open cv 3.2 c++. I am getting error output of pose estimation of the object. Help me to sort out this error. The values and the error image are attached below. Mat K =…
van
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Tango camera extrinsics

The extrinsic matrix for camera calibration based on the MATLAB link should be 4x3 matrix (including orientation and translation) means we need 12 elements, however, based on the explanation in Tango documentation we only get 3 numbers for…
VahidB
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how to calculate camera extrinsic parameters from three known dimensions in the target plane

My question is as follows. A single camera (constant in both position and orientation) is applied to monitor the motion of a far-away planar target. The intrinsic parameters including focal length, sensor resolution, principal point, are known. The…
yan
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cv::solvePnPRansac returns identity matrix

I want to find the object pose given 3D-to-2D correspondences using cv::solvePnPRansac. My correspondences might have outliers, so I don't want to use cv::solvePnP. I have used 3D-to-2D correspondences of a snapshot taken from a camera in opengl. So…
bluechill
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Camera Parameters of Rotated Frame

I have a frame/image that was captured using a calibrated camera. Both sets of camera parameters (intrinsic and extrinsic) are available. I was wondering, if I flip the frame in both the horizontal and vertical directions (effectively rotating it…
informer2000
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Image to world projection

I have a RGB image and 8-bit depth data of the same scene from two different cameras and need to generate point cloud in 3D space. I used this paper to understand how to do it. As mentioned in Eq. 1 we can find non-homogeneous coordinates of the…
Huá dé ní 華得尼
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