Chessboard Open Cv Python Tutorial Code For That
Chessboard Open Cv Python Tutorial How To Do This

After reading the file Ive an additional post-processing function that checks validity of the input.

However, with the introduction of the cheap pinhole cameras in the late 20th century, they became a common occurrence in our everyday life.

Unfortunately, this cheapness comes with its price: significant distortion.

Luckily, these are constants and with a calibration and some remapping we can correct this.

Furthermore, with calibration you may also determine the relation between the cameras natural units (pixels) and the real world units (for example millimeters).

The presence of the radial distortion manifests in form of the barrel or fish-eye effect.

The unknown parameters are (fx) and (fy) (camera focal lengths) and ((cx, cy)) which are the optical centers expressed in pixels coordinates.

If for both axes a common focal length is used with a given (a) aspect ratio (usually 1), then (fyfxa) and in the upper formula we will have a single focal length (f).

The matrix containing these four parameters is referred to as the camera matrix.

While the distortion coefficients are the same regardless of the camera resolutions used, these should be scaled along with the current resolution from the calibrated resolution.

Calculation of these parameters is done through basic geometrical equations.

Currently OpenCV supports three types of objects for calibration.

To solve the equation you need at least a predetermined number of pattern snapshots to form a well-posed equation system.

This number is higher for the chessboard pattern and less for the circle ones.

For example, in theory the chessboard pattern requires at least two snapshots.

Heres a sample configuration file in XML format.

In the configuration file you may choose to use camera as an input, a video file or an image list.

If you opt for the last one, you will need to create a configuration file where you enumerate the images to use.

The important part to remember is that the images need to be specified using the absolute path or the relative one from your applications working directory.

You may find all this in the samples directory mentioned above.

Although, this is an important part of it, it has nothing to do with the subject of this tutorial: camera calibration.

Chessboard Open Cv Python Tutorial Code For That

Therefore, Ive chosen not to post the code for that part here.

Chessboard Open Cv Python Tutorial How To Do This

Technical background on how to do this you can find in the File Input and Output using XML and YAML files tutorial.

Chessboard Pdf Open Cv Python Tutorial