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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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How does Kinect calculates depth?

I'm getting a little bit confused here. How does Kinect calculates depth: What I understand is that The IR projector throws out a pattern which is reflected back and read by the IR camera. Now the IR camera knows the pattern for a particular depth.…
Shashwat
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Augmented Reality OpenGL+OpenCV

I am very new to OpenCV with a limited experience on OpenGL. I am willing to overlay a 3D object on a calibrated image of a checkerboard. Any tips or guidance?
user3303396
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Understanding of openCV undistortion

I'm receiving depth images of a tof camera via MATLAB. the delivered drivers of the tof camera to compute x,y,z coordinates out of the depth image are using openCV function, which are implemented in MATLAB via mex-files. But later on I can't use…
bluhub
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Calibrate camera with opencv, how does it work and how do i have to move my chessboard

I'm using openCV the calibrateCamera function to calibrate my camera. I started from the tutorial implementation, but there seems something wrong. The camera is looking down on a table and i use a chessboard with an area that covers about 1/2 or 1/4…
user2812874
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Opencv: Computing fundamental matrix from R and T

I want to compute the epipolar lines of a stereo camera. I know both camera intrinsics matrix as well as R and T. I tried to compute the essential matrix as told in Learning Opencv book and wikipedia. where [t]x is the matrix representation of the…
Josep Bosch
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Google Goggles Camera Autofocus

The Google Goggles app auto-focuses considerably better than the default Camera app on my Nexus 4 (and other phones/tablets I tried on). In fact, it does it so good I think they do it software. Does anyone know how the Goggles app does the autofocus…
Jasoneer
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iPhone 5s Camera Calibration Parameters

I was wondering if anyone out there had any reliable intrinsic or extrinsic parameters they would be willing to share with regards to the iPhone 5s camera? I'm working in OpenCV and would like to undistort my images prior to processing. I have been…
justagruvn
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Auto white balancing for camera

I am developing a sample camera and I am able to control image sensor directly. The sensors gives out Bayer image and I need to do show images as live view. I looked at debayering codes and also white balancing. Is there any library in C/C++ that…
mans
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Project 2d points in camera 1 image to camera 2 image after a stereo calibration

I am doing stereo calibration of two cameras (let's name them L and R) with opencv. I use 20 pairs of checkerboard images and compute the transformation of R with respect to L. What I want to do is use a new pair of images, compute the 2d…
Sassa
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Rectification of uncalibrated cameras, via fundamental matrix

I'm trying to do calibration of Kinect camera and external camera, with Emgu/OpenCV. I'm stuck and I would really appreciate any help. I've choose do this via fundamental matrix, i.e. epipolar geometry. But the result is not as I've expected.…
user1326511
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Image is warped after stereo rectification

I'm currently implementing the stereovision with OpenCV. Now I'm using the Stereo_Calib sample to remove the distortion en rectify the image. Removing the distortion works fine. But when I apply rectification, the image is very warped. This is the…
SteffenDM
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Camera Error 100 Detail

Can anyone tell me what exactly Camera Error 100 is? At the time of taking picture sometimes I am getting it. It happened when I called camera.takepicutre(); and shutter and raw callback are called, but jpeg-callback is not getting called. I just…
PiyushMishra
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Camera calibration, focal length value seems too large

I tried a camera calibration with python and opencv to find the camera matrix. I used the following code from this link https://automaticaddison.com/how-to-perform-camera-calibration-using-opencv/ import cv2 # Import the OpenCV library to enable…
lkrss
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Eye-In-Hand Calibration OpenCV

I have a setup where a (2D) camera is mounted on the end-effector of a robot arm - similar to the OpenCV documentation: I want to calibrate the camera and find the transformation from camera to end-effector. I have already calibrated the camera…
ChrisRun
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OpenCV - Improving marker detection on Charuco board

I am using OpenCV's aruco::CharucoBoard object for calibration purposes and noticed that its marker detection doesn't find all visible markers/corners in the images. I started investigate the matter and tried to detect the markers on the image of…
Zachi Shtain
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