joeynelson / cameracalibrations

CameraCalibrations

This is a package for camera calibration in Julia.

How to install

] add CameraCalibrations

How to use

First we build the calibration object based on the files: the image files of the checkerboard, n_corners: the number of corners in each of the sides of the checkerboard, and checker_size: the physical size of the checker (e.g. in cm).

using CameraCalibrations
c = Calibration(files, n_corners, checker_size)

Then we can use that object to calibrate pixel coordinates and/or images, given the extrinsic image we want to refer to:

i1 = RowCol(1.2, 3.4) # a cartesian index in image-pixel coordinates
xyz = c(i1, 1) # convert to real-world coordinates of the first image
i2 = c(xyz, 1) # convert back to pixel coordinates
i2 ≈ i1 # true

Why

use this

1. This is currently (1/4/2023) the only package for camera calibration in Julia.
2. It allows for calibration using any number of image (even one).

not use this

1. Detecting the corners of the checkerboards and calculating the camera-model's parameters is done used OpenCV.
2. You can't supply it with in-memory images, just file names.