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Questions tagged [camera-intrinsics]

18 questions
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How does camera distortion coefficients and camera intrinsic parameters change after image crop or resize?

I try to make image some changes(crop, resize, undistort) and I want to know how distortion coefficients and camera intrinsinc parameters change after that. Origin Image shape = [848, 480] camera matrix = [[fx, 0, cx], [0, fy, cy], [0, 0,…
mphong
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How to write custom calibration parameters to intel Realsense D435 camera

I'm working with Intelrealsense D435 and what I plan to do is to overlay an image on top of the point cloud using the opencv_pointcloud_viewer.py example in the python wrapper. First of all, I've done calibration using checkerboard and clearly…
Parinaz
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Depth camera intrinsics and recording resolution - do they need to match?

I have a 455 Intel RealSense depth camera I'm trying to get up and running. I was able to find the camera intrinsics using the pyrealsense2 library like so: pipeline = rs.pipeline() cfg = pipeline.start() profile =…
Emma
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Compute Homography Matrix from Intrinsic and Extrinsic Matrices

I have Intrinsic (K) and Extrinsic ([R|t]) matrices from camera calibration. How do I compute homography matrix (H)? I have tried H = K [R|t] with z-component of R matrix = 0 and updating H matrix such that the destination image points lie…
zovelsanj
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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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Conversion From Image to World Coordinates

I am taking a depth map and converting it to a point cloud using an intrinsic matrix associated with the camera I have. Then using the X, Y, Z coordinates - I change the Z coordinate of certain points. Then I convert all coordinates back to image…
Vasudev
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Retrieving intrinsic matrix from two stereo depth sensor that resulted in a single depth image

I have one stereo camera that outputs the depth and RGB images. I have retrieved the distortion and camera matrix using the checkered board(intrinsic matrix for RGB camera). However, in the above discussion it seems like we need the depth sensor…
Harshal Shirsath
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Broadcasting input array from shape (2,) into shape (3,), in python

I need to find the intrinsic matrix "K"., for a given data set but, I am facing this error: ValueError: could not broadcast input array from shape (2,) into shape (3,) At line: A[2*i+1, :3] = np.expand_dims(image_points[i, :], axis=0) This is my…
Kaustubh
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How the extrinsics and intrinsics change when Intrinsics coordinate moves from the center to the top-left corner of the image

I have got images ,intrinsics and extrinsics. I want to fuse the depthmap to cloud point. Intrinsics and extrinsics are in Meter. But I need to convert them to Pixel so that I can apply them to my other projects. And the Instrinsics coordinate is…
Dummy Head
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How to provide Intrinsics Parameters to Vuforia with a Custom Driver to remove distortion?

I'm working on a project where I track an object using a Model Target and display its 3D model in a virtual environment for interaction. The user wears a VR headset and views the environment with the 3D model. The camera is placed in front of the…
Lorenzo Gerini
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Manually modeling and rendering a 3D object to 2D using numpy with extrinsic and intrinsic params

My current goal is to learn the math behind classic computer vision by attempting to re-create from scratch the animation produced here via modeling the paper in world coordinates and then computing the image points using intrinsic and extrinsic…
user924387
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Export intrinsic camera parameters in Blender via .gltf file

I am working on a .gltf data loader in python for the quite popular multi-NeRF framework. I exported the 3D model in Blender as a .gltf file with the appropriate export settings which means that I also ticked the blender camera in the settings to…
Paul45577
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The coordinates of the reconstructed 3D points are different after the virtual camera intrinsic K has also changed proportionally after image resize?

As far as I know, after image resize, the corresponding intrinsic parameter K also changes proportionally, but why the coordinates of the 3D reconstruction of the same point are not the same? The following python program is a simple experiment, the…
xing cui
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Getting 2 values of focal length when finding Intrinsic camera matrix (F not Fx,Fy)?

The following image is the example that was given in my computer vision class. Now I cant understand why we are getting 2 unique values of f. I can understand if mxf and myf are different, but shouldn't the focal length 'f' be the same?
Rohaan Manzoor
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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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