It is not recommended to compute NFIQ quality during real-time capture (using ISegLib_NFIQScore in C++ or nfiqScore in Java), because the computation is slow.

You should compute only Innovatrics proprietary quality in real time capture(using ISegLib_GetPlacementScore in C++ or getPlacementScore in Java), which is computed quickly and compute NFIQ only in post-processing (final quality check).