From Ohm

A transfer function, is a generalized concept of color-mapping, where the transfer function assigns physical properties $p$, such as colors $rgb$, to scalar values $s$.

$TF(s) = p$

**Linear transfer functions** are realized by a global mapping coefficient:

$ TF(s)=\mu \cdot s $

The mapping to Hounsfield values is a special case of linear mapping with a **scale**- and **offset**-factor:

$ TF(s)=\mu \cdot s + o $ with $ \mu=1000/0.15cm^{-1}, o=-1000 $

A **non-linear assignment** is represented as

- threshold function → $TF_t(s) = 1: s>t, 0: else$
- lookup table
- union of line segments.

**Display of transfer functions** in the TF Editor as normalized unit function curves, e.g. with gimp “Freehand Curves”:

Retrieved from http://schorsch.efi.fh-nuernberg.de/roettger/index.php/MedicalVisualization/TransferFunctions

Page last modified on January 10, 2020, at 10:27 AM