geometricLinear Calibration (from a geometry)

Linear Calibration calibrates a camera so a real world coordinate system may be used instead of image pixels.

Typically this tool is used in two modes:

    In calibration mode:
        The calibration is performed by looking at an object of known size. This calibration is saved to file.

    In run mode:
        The calibration is loaded and attached to the current image in the Image viewer. When using a calibration, load the calibration that was previously saved.

Saving the sequence or workspace will save this calibration data.

Defining a Calibration Manually

Under the image calibration properties input the scale factors.

The scale factor for x and y
Scale X mm/pixel
Scale Y mm/pixel

The desired world origin
World Origin X
World Origin Y

The pixel location for the world origin
Pixel Origin X
Pixel Origin Y

Defining a 2D Camera perspective calibration by looking at an object of known size

Looking at a rectangle
Not implemented to date

Looking at a circle/ellipse
Input is an ellipse or a set of points that define a circle. Under the grid settings (geogrid tab) set the grid properties as follows:

Grid Size:
X Dimension = 2
Y Dimension = 2
Z Dimension (if available) = 1

Spacing: Set to the ellipse diameter in x and y

On the Geometric tab set the "Calibration/Run method to "Input points = ellipse". Ensure that the points that define the ellips (usually the prevoius step in the program) have been defined. Hitting the set button will create the calibration. This can now be saved. Notice that when the calibration has been created the following properties reflect the calibration data:
Scale X mm/pixel
Scale Y mm/pixel
The scale factor for x and y.
World Origin X
World Origin Y
The desired world origin
Pixel Origin X
Pixel Origin Y             

Defining a Calibration 2D Camera perspective calibration by looking at a grid

Input is a set of points representing locations of a grid in space
Input is a set of points that define a grid in 2D or 3D space
       
        X distance between point
        Y distance between point
        Grid size X
        Grid size Y
        OffsetX between successive rows
        OffsetY between successive columns
        OffsetZ between successive planes

3D camera calibration
       Similar to the 2D case two planes are observed. Each plane a set of points is defined.
        Grid size X
        Grid size Y
        Grid size Y
        OffsetX between successive rows
        OffsetY between successive columns
        OffsetZ between successive columns
        OffsetZ between successive columns