Feature/replace nan values#30
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* [ADD] : sigima/enums.py : - add ReplacementStrategySignal and ReplacementStrategyImage - define replacement modes for NaN, +Inf and -Inf * [ADD] : sigima/proc/base.py : - add ReplaceSpecialValuesSignalParam and ReplaceSpecialValuesImageParam - add per-target parameters for strategy, constant value and neighbor size * [ADD] : sigima/proc/signal/processing.py : - add replace_special_values for signals - support delete, fill, interpolation and neighbor-based strategies * [ADD] : sigima/proc/image/exposure.py : - add replace_special_values for images - support fixed, statistic and neighbor-based strategies * [ADD] : sigima/tools/signal/replace_values.py and sigima/tools/image/replace_values.py : - add low-level helpers for special value replacement - compute statistics from finite values only - add fallback when statistic result is NaN * [UPDATE] : sigima/params.py, sigima/proc/signal/__init__.py and sigima/proc/image/__init__.py : - export new parameter classes and processing functions * [UPDATE] : doc/user_guide/features.rst : - document replace_special_values for signal and image conditioning * [TEST] : sigima/tests/signal/replace_special_values_unit_test.py and sigima/tests/image/replace_special_values_unit_test.py : - add unit and validation tests for strategies and edge cases
… by typing), prevent float64 image copy before any operations
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