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Requirements Software operation Defining Calibration Tasks Definitions and Theory

Supported Systems

Supported Targets

Required Evidence

Test Setup

Calibration Procedure

User Interface

Use in Imatest IT

Module settings

Module outputs

Defining a Device

Defining Distortion

Defining the System of Devices

Defining the Target

Defining a Test Capture

Defining a Test Image

Homogenous Coordinates

Projective Camera Model

Multi-Camera Systems

Distortion Models

Coordinate Systems

Rotations and Translations


Imatest must know about the physical target being used in order to map image points to real-world spatial coordinates. 


Target Type

Supported values: Checkerboard

Note: Current the Geometric Calibrator only supports planar checkerboard targets, as described here. In the future, this list will grow.


Target Variant

Supported values: 3-Circle Type 1,  3-Circle Type 2

Each supported target type may have many variants. 

For checkerboard targets, the supported variants are identified by their center-point defining fiducial pattern. (Checkerboards without one of these patterns are not supported in this module though may be used in Checkerboard module for other measurements).

Type 1 fiducial in standard orientation

Type 2 fiducial in standard orientation

Element Dimensions

Supported values: scalar value or two-element array

The actual size of the checkers of the physical target must be supplied. If the element size is supplied as a single value, it is assumed the checkers are square. If a two-element array is entered, the values indicate the x- and y-sizing, respectively. 

Values must be accompanied by a dimensional unit indicating the SI unit sizes are defined in. 

(Note: For high-precision use cases, measuring the non-squareness of your actual target is essentially, even of a nominally-square checkerboard.)