FAQ

/FAQ

Calibration data generated with MetriCalibrate Intrinsic is stored in so-called projective transformation files (*.pt). The format is binary and holds all parameteres generated by MetriCalibrate Intrinsic. In addition to this data it also stores useful meta information on e.g. error estimates.

Name Value Type Size (Bytes) Comment Default
MetriStreamItemID (unique ID) int 4 ID for identification of item-type 0x2EB27A52
Height h int 4 Number of sensor lines
Width w int 4 Number of sensor columns
FocalLengthX fx float 4 Focal length in x-Direction
FocalLengthY fy float 4 Focal length in y-Direction
PrincipalPointX cx float 4 Principal point in x-Direction (in pixel coordinates) w/2
PrincipalPointY cy float 4 Principal point in y-Direction (in pixel coordinates) h/2
K1 k1 float 4 1st radial distortion parameter
K2 k2 float 4 2nd radial distortion parameter
K3 k3 float 4 3rd radial distortion parameter
P1 p1 float 4 1st tangential distortion parameter
P2 p2 float 4 2nd tangential distortion parameter
Timestamp (Ticks) long 8 Timestamp for calibration creation 0
CameraSerial string Serial number of the camera
FocalLengthX Error fxError float 4 Error estimate for focal length calculation X NaN
FocalLengthY Error fyError float 4 Error estimate for focal length calculation Y NaN
PrincipalPointX Error cxError float 4 Error estimate for principal point calculation X NaN
PrincipalPointY Error cyError float 4 Error estimate for principal point calculation Y NaN
K1 Error k1Error float 4 Error estimate for k1 NaN
K2 Error k2Error float 4 Error estimate for k2 NaN
K3 Error k3Error float 4 Error estimate for k3 NaN
P1 Error p1Error float 4 Error estimate for p1 NaN
P2 Error p2Error float 4 Error estimate for p2 NaN
PixelErrorX eX float 4 Average backprojection error (x-component) NaN
PixelErrorY eY float 4 Average backprojection error (y-component) NaN
nCornersPerImage nC int 4 Number of corners of the calibration checkerboard 0
nImages nI int 4 Number of images used for calibration 0