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.. _ref-thresholding:
.. module:: pywt.thresholding
.. include:: ../substitutions.rst
Thresholding functions
======================
The :mod:`~pywt.thresholding` helper module implements the most popular signal
thresholding functions.
Hard thresholding
-----------------
.. function:: hard(data, value[, substitute=0])
Hard thresholding. Replace all *data* values with *substitute* where their
absolute value is less than the *value* param.
*Data* values with absolute value greater or equal to the thresholding
*value* stay untouched.
:param data: numeric data
:param value: thresholding value
:param substitute: substitute value
:returns: array
Soft thresholding
-----------------
.. function:: soft(data, value[, substitute=0])
Soft thresholding.
:param data: numeric data
:param value: thresholding value
:param substitute: substitute value
:returns: array
Greater
-------
.. function:: greater(data, value[, substitute=0])
Replace *data* with *substitute* where *data* is below the thresholding
*value*.
`Greater` *data* values pass untouched.
:param data: numeric data
:param value: thresholding value
:param substitute: substitute value
:returns: array
Less
----
.. function:: less(data, value[, substitute=0])
Replace *data* with *substitute* where *data* is above the thresholding
*value*.
`Less` *data* values pass untouched.
:param data: numeric data
:param value: thresholding value
:param substitute: substitute value
:returns: array
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