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Questions tagged [camera-matrix]

In computer vision a camera matrix or (camera) projection matrix is a matrix which describes the mapping of a pinhole camera from 3D points in the world to 2D points in an image.

In computer vision a camera matrix or (camera) projection matrix is a matrix which describes the mapping of a pinhole camera from 3D points in the world to 2D points in an image.

The Wikipedia Article provides a deeper explanation: http://en.wikipedia.org/wiki/Camera_matrix

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OpenGL Camera rotation flickering

since some time, I am stucked with a camera rotation problem in OpenGL. I try to rotate the camera via mouse movement, but the camera is only flickering (the object which is spoted by the camera is flickering). I initialize the camera as follows:…
Knut
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Align cameras facing each other using calibration parameters obtained from cv2.calibratecamera

I have setup as shown in the simplified diagram, where two cameras are facing each other and are 180 degree apart. I have horizontally flipped the image of camera 2. I calibrate both camera simultaneously using chessboard pattern (size=7,7) and…
vashista
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I am not understanding the reason for this error 'cameraMatrix' is an invalid keyword argument for detectMarkers()

Full error is: OpenCV(4.7.0) :-1: error: (-5:Bad argument) in function 'detectMarkers' > Overload resolution failed: > - 'cameraMatrix' is an invalid keyword argument for detectMarkers() My camera calibration code works fine (to my understanding)…
NiccyT
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Project a box from world to image plane

I have a calibrated camera with extrinsincs and intrinsics parameters such that I can project a visible point in the world back to the image. But I need to be able to deal with points that are also outside of what the camera can see. how can I know…
Al Wld
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How to find the location of a point in an image in millimeters using camera matrix?

I am using a standard 640x480 webcam. I have done Camera calibration in OpenCV in Python 3. This the Code I am using. The code is working and giving me the Camera Matrix and Distortion Coefficients successfully. Now, How can I find how many…
Tehseen
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Determining the approximate camera matrix

I would like to determine the camera matrix of a feed. The image is of width shape=(1440,2960) where 1440 is the height and 2960 is the width. I would like to find the camera matrix for the same. I used the following calculation to find cx,cy cx =…
user1241241
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Do you obtain same Camera Matrix result using cv::calibrateCamera() that using cv::fisheye::calibrate()

I am working on a project to calibrate fisheye cameras, the main problem is that i want to save the parameters obtained in the calibration. Using cv::calibrateCamera(), Camera Matrix is a cv::Mat that using cv::FileStorage i can easy read and write.…
Alejandro
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Calculating a distance from an object to a camera using stereo vision

I have been trying to calculate a distance between an object and one of my cameras (the same model). After calibration, I successfully got the following matrix. The resolution was 600 x 480. Left Camera Matrix [[624.65871068 0. 279.196958 …
SSS
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Get Projection and View Matrix from Camera Matrix

I have 3*4 Camera Matrix which is P = K[R | -RC] where K is intrinsic camera matrix, R is rotation matrix, C is camera position with respect to world origin and -RC is translation. I can decompose P to K, R and C. How I want to render in openGL…
Chaitanya Patel
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Is there camera RELATIVE rotation matrix?

Suppose that I have two cameras. I don't know exactly the poses of these two cameras. So their rotation matrice denoted as R1 and R2, respectively, are unknown. But I know the relative angles of these cameras along three axes. I mean if the angles…
opmfan
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Camera extrinsic parameters as dual quaternion

Does it make sense to represent the pinhole camera extrinsic parameters as a dual quaternion instead of the classical 4x3 matrix when projecting a 3D world point to the image plane of the camera? I also need to do the inverse (from 2D + depth to 3D…
KBowser
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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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from 2D image to 3D model

I have a 2D image and a 3D cad model. I have camera matrix P where P=k[R -RC]. How can I recalculate the 3 D model [X Y Z ] from that view which camera sees by pixel coordinates [u v]? Thanks in advance for your help.
Mehdi Bahar
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OpenGL - Trouble with first person camera matrix

I have tried my best to create a camera that mimics the style of a first person camera. I have just switched from the old OpenGL method of rendering and am now ready to tackle a camera matrix. Here is my code for my camera update. void…
Pladnius Brooks
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