Get Calibration Camera Parameters (G Dataflow)

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Last Modified: June 25, 2019

Returns the internal and external parameters of the learned camera model.

Inputs/Outputs
Compatibility

reference image

Reference to the image containing calibration information.

error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error	error in contains an error

If no error occurred before the node runs, the node begins execution normally. If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.	If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

calibrated image dup

Reference to the output image.

distortion model coefficients

Learned coefficients of the polynomial model.

distortion model

Type of distortion model learned.

Name	Value	Description
none	-1	No distortion model was learned.
polynomial	0	A polynomial distortion model was learned.
division	1	A division distortion model was learned.

polynomial coefficients

Learned coefficients of the polynomial model.

radial coefficients

Learned radial coefficients of the polynomial model.

tangential coefficients

Learned tangential coefficients of the polynomial model.

division model kappa

Learned kappa coefficient of the division model.

internal parameters

Focal length learned and optical center of the camera model.

insufficient data

Boolean value that specifies insufficient information.

Possible conditions for insufficient information are the number of different projection planes is fewer than 5, the angle difference of the projection planes is less than 20 degrees, or the lens in use is a telecentric lens.

TRUE	One or more insufficient data conditions present
FALSE	Sufficient data

focal length (pixel)

Focal length in pixel units.

Use the following equation to obtain the focal length in real-world units: focal length in millimeters = focal length in pixels x pixel size in millimeters. Refer to your camera documentation to obtain the pixel size.

fx

Focal length in x direction.

fy

Focal length in y direction.

optical center (pixel)

Optical center in image.

cx

X resolution of the optical center.

cy

Y resolution of the optical center.

projection matrix

Output that indicates the projection matrix, also known as the homography matrix, of the working plane.

error out

Error information.

The node produces this output according to standard error behavior.