Questions tagged [camera-pose]
The camera-pose tag has no usage guidance.
30
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How do I estimate the position and orientation of two instruments looking at the same target?
Consider the following lab set-up:
Two instruments: a laser profiler (L) and a line scanner camera (C) are mounted on a rack so that they are facing a flat target downwards.
At time $t=0$, that is ...
5
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3
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966
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How do I estimate the pose of a camera looking at a flat horizontal surface?
I have a camera looking down on a flat horizontal surface, Z=0.
The position of the camera with respect to the surface: $[XC,YC,ZC]$ is unknown.
Also the orientation of the camera with respect to the ...
1
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1
answer
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Understanding difference in rotation and translation
Hi I am a newbie to the field so please don't mind a rookie question. I have read multiple articles and want to ensure my understanding is correct.
I have following two images. In the second image, ...
0
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1
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Homography valid for patch within the image but not the entire image?
The homography I have is non-degenerate (det!=0), and generated from a valid planar pose. When I use it to warp the four corners of image, it returns something like the following:
...
1
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1
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69
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How does transformation matrix and camera matrix change when indexing pixels from -1 to 1 instead of 0 to N-1
I'm trying to warp frames for view synthesis. Specifically, given a frame1 and poses of frame1 and frame2, I'm trying to warp frame1 to frame2's pose/view. For this, I'm indexing pixel locations as $[...
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1
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236
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Find camera pose by knowing triangle coordinates
I have this concrete problem where I know the 3 coordinates of a triangle $ABC$ in a $xyz$ frame reference and I need to estimate the position $P$ and direction $\vec{n_{p}}$ of a stationary camera ...
1
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1
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252
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Math for projecting 3d world point to VR image coordinates
Suppose, I've a 3d world point $P$ and I want to project it onto the image plane of camera, I can do it as follows
$$M = \begin{bmatrix}
R & t \\
0 & 1 \\
\end{bmatrix}$$
$$p = K \cdot M \cdot ...
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1
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429
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Intuition about tag pose estimation accuracy
I have some difficulties to have a correct intuition about expected pose accuracy when dealing with planar pose estimation (e.g. pose estimation from AprilTag detection) and perspective camera model.
...
0
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1
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459
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Camera Pose Estimation from Vanishing Points
I want to estimate the pose of camera (Location and Orientation). Can I use Vanishing Points to get the location and orientation of the camera?
There is object in the image which I also know his size,...
-1
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1
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244
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Why reprojection error is minimized instead of triangulation error for bundle adjustment?
For bundle adjustment optmization why is reprojection error minimized instead of traingulation error or ray-to-3d point error? Disadvantage with reprojection error is: for perspective camera, its ...
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0
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Virtual camera from panorama
I'm trying to virtualize a camera from a panorama.
That is, suppose I have a really big picture, for example: a soccer field.
Then I want to simulate a camera that focuses on certain regions of the ...
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0
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47
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Bundle adjustment optimization parameters
While reading the Wikipedia article on Bundle adjustment, I came across the following objective function used to represent the bundle adjustment problem.
I have two questions regarding this objective ...
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3
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945
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Camera Calibration - why do you have to move the calibration board?
I understand the mathematical derivation of Zhang's Method for camera calibration but what I don't understand is why we need to move and rotate the calibration board for several frames in order to get ...
1
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1
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572
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Camera and laser scanner calibration final approach questions
A while ago I posted this question about camera and laser scanner calibration. I've been away from this project for a while and now I need to come back and get a final approach to calibrate properly ...
0
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1
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313
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Pinhole camera model from houdini parameters
From a simulation with Houdini software I retrieved these parameters:
Camera position: -0.675839, 33.5945, 0.0318854
Camera Rotation: 0.0318854, 92.4693, 0.1
Focal Length: 52.5172 mm
Image size: 1920 ...
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0
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136
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Extrinsic Camera Parameters without introducing control points?
I am new to the field of Camera Calibration. We have successfully calibrated our camera through classic method (using checkerboard etc).
I recently realized there is a field of research for Automatic ...
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1
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Which pattern (circle pattern or checkerboard pattern) should be used for automotive camera calibration (fisheye/wide webcam)?
Calibrating a Fish-eye camera / webcam with large angle mounted on car by using opencv 3
One important issue is to define the calibration pattern and its position !!!!
The affects error that paly an ...
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1
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How are the scaling parameters included (extracted from) an essential matrix?
An essential matrix relates corresponding points between two images assuming that a camera satisfies the pinhole camera model, and can be expressed as:
$$E=K'^TFK$$
where K is the calibration and F ...
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2
answers
1k
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Calibration (intrinsic) parameters of a virtual camera with some known information
I need the calibration matrix of my simulated camera, I am trying to fully comprehend and follow the steps from Step by Step Camera Pose Estimation for Visual Tracking and Planar Markers as well as ...
5
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1
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2k
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Obtain motion between image features by means of the homography matrix
I have been reading several really good answers about how to obtain camera pose (rotation, translation, etc), such as this one and this one, but I am not sure how this applies to my problem.
My ...
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458
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In which way do image transformations change camera extrinsics?
Given a pinhole camera model, we have an image and according camera intrinsics K and extrinsic parameters R.
When we scale the ...
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1
answer
1k
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Camera calibration vs. registration
Suppose I have two cameras, c1 and c2 that are securely installed and do not move. What I want is a matrix T, that takes a pixel of an image from camera c1 and calculates the according pixel in an ...
1
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1
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379
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Does accurate translation estimation using a camera matrix mean the orientation estimation will also be accurate?
Pose Estimation of single camera and planar pattern:
If I have an appropriate camera matrix with intrinsic parameters that allows me to calculate translation of the camera relative to a chessboard, ...
2
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3
answers
331
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Can you average out focal length from different camera calibration sessions?
If I perform a number of camera calibration routines at a fixed resolution, with various sizes of calibration patterns (like checkerboards), at various distances and get various values for focal ...
2
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1
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5k
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Ground plane estimation from a single image (was: confusion about homography and calibration camera parameters)
I'm new to this multiple view geometry issues and I'm a little bit lost, and some concept are not clear at all.
I have a calibrated camera ( = I have distortion coefficents, field of view, and with ...
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2
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1k
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Estimating Plane Pose Without Knowledge of Intrinsic Camera Parameters
Assume a camera has no skew, and has square pixels, that is, its camera-calibration matrix, $K$, looks like:
$$
K = \left[\begin{matrix} \alpha&0&u_x\\0&\alpha&u_y\\0&0&1 \end{...
29
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2
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32k
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How does resizing an image affect the intrinsic camera matrix?
I have a camera matrix (I know both intrinsic and extrinsic parameters) known for image of size HxW. (I use this matrix for some calculations I need).
I want to use a smaller image, say: $\frac{H}{2}\...
6
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1
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2k
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Pose from Homography matrix - Zhang method
This post also contributes to the post at Step by Step Camera Pose Estimation for Visual Tracking and Planar Markers by Jav_Rock (since I cannot add any comment there and I don't know why)
It can be ...
25
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2
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54k
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Step by Step Camera Pose Estimation for Visual Tracking and Planar Markers
I have been working on the topic of camera pose estimation for augmented reality and visual tracking applications for a while and I think that although there is a lot of detailed information on the ...
2
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3
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568
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pose estimation
I am doing a final year project which involves finding the position and orientation of a screw which has to be opened by a robot hand having a screw driver as an end effector.
I have developed a ...