Two Dimensional to Three Dimensional Map Data Attribute
| Tag | (0022,1531) |
|---|---|
| Type | Required (1) |
| Keyword | TwoDimensionalToThreeDimensionalMapData |
| Value Multiplicity | 1 |
| Value Representation | Other Float String (OF) |
See Section C.8.17.12.1.2 for further explanation.
Section C.8.17.12.1.2
C.8.17.12.1.2 Two Dimensional to Three Dimensional Map Data
Two Dimensional to Three Dimensional Map Data (0022,1531) is used to convey a sparsely sampled map of 2D image pixels (with sub pixel resolution) to 3D coordinates.
The origin of the 3D points shall be the Ophthalmic Coordinate System which is based upon the corneal vertex (i.e., the x, y and z coordinates of 0.0, 0.0, 0.0, in mm). See Section C.8.30.3.1.4.
All data points are encoded as a floating point 5-tuple where the values are:
-
1st value = 2D horizontal location (a sub pixel location between 0 and number of columns)
-
2nd value = 2D vertical location (a sub pixel location between 0 and number of rows)
-
3rd value = x 3D-coordinate
-
4th value = y 3D-coordinate
-
5th value = z 3D-coordinate
The ordering is 2D horizontal location1, 2D vertical location1, 3Dx1, 3Dy1, 3Dz1, … 2D horizontal locationn, 2D vertical locationn, 3Dxn, 3Dyn, 3Dzn.