Whole Scan Images Creating EDF Images with Blank Fields is Slow
Whole Scan Images

Information in this article applies to:

  • uScope Navigator V4.5 — uScope Navigator V4.6

Article ID: NWS2356 — Created: 4 Dec 2020 — Reviewed: 5 Dec 2020


Creating an EDF layer from a multi-layer scan takes a very long time to process.


This can be caused on some computers when there are a large number of blank fields in the scanned region of interest.

EDF processing searches each layer in the focus stack (or Z-stack) to find the pixels that are in the best focus. When the field is blank, there are no best focused pixels and the EDF algorithm may take a long time to complete. Some computers seem to work just fine while others exhibit these performance issues.


There are several work-arounds you can try to mitigate this problem.

  • Change Helicon Focus Performance Settings
    Change the Helicon Focus performance options to enable the OpenCL GPU driver if it's not already in use; or disable it (and use the CPU only for EDF processing) if the OpenCL driver is selected. Refer to Helicon Focus 7 GPU Settings for more details.
  • Scan Smaller Regions of Interest
    Smaller regions of interest have fewer blank fields and are likely to be less affected by this problem.

This performance issue has been encountered on only a few computer systems. Not all CPU/GPU combinations are affected.


This problem will be addressed in a future release of uScope Navigator once we have data on its exact cause.

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