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Fig. 5.10. Windows of TCB Control program used for support of MRTD measurement [8].
5.1.11 Interpretation of MRTD measurement results
MRTD tests generate two functions: horizontal MRTDh(ν) and horizontal
MRTDv(ν) that can be graphically represented as two separate curves. MRTD requirements usually do not refer directly to horizontal MRTD or vertical MRTD but
to MRTD in general.
As it was mentioned in Section 5.1.9 there is no consensus in specialist literature what averaging method should be used (algebraic mean or geometric mean;
temperature averaging or frequency averaging). Literature proposals are inconsistent in this matter. The author typically uses frequency averaging using algebraic
sum because this method can be used for all measurement points. However, other
options are also possible as long as it is clearly stated in the report what methods
was used.
Even when MRTD test results are presented in form of a single curve it is often
not easy to decide whether the tested imager fulfills the MRTD requirements or
not. Now, let us assume that after measurements we get the average MRTD curve
shown in Fig. 5.7. Next, let us consider several versions of requirements on imager MRTD shown in Table 5.12 and find out whether the tested thermal imager
fulfills these requirements.
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