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Address re-filtering sigma estimate issue

Zhang, Chen requested to merge re_filter_fix into next

This PR introduces the following changes:

  • added a new function to estimate the sigma required by re-filtering
  • switch to more comprehensive comparison plot for the example notebook
  • re-enabled re-filtering

Test instructions

  • Create and activate conda environment
  • Checkout branch
  • Run unit test
  • Run the example notebook

Example output figure: bm3d_vs_bm3dornl_sino

EWM item: 5224

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