opencv/modules/photo/doc/npr.rst

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Non-Photorealistic Rendering
============================
.. highlight:: cpp
edgePreservingFilter
--------------------
Filtering is the fundamental operation in image and video processing. Edge-preserving smoothing filters are used in many different applications.
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.. ocv:function:: void edgePreservingFilter(InputArray src, OutputArray dst, int flags = 1, float sigma_s = 60, float sigma_r = 0.4f)
:param src: Input 8-bit 3-channel image.
:param dst: Output 8-bit 3-channel image.
:param flags: Edge preserving filters:
* **RECURS_FILTER**
* **NORMCONV_FILTER**
:param sigma_s: Range between 0 to 200.
:param sigma_r: Range between 0 to 1.
detailEnhance
-------------
This filter enhances the details of a particular image.
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.. ocv:function:: void detailEnhance(InputArray src, OutputArray dst, float sigma_s = 10, float sigma_r = 0.15f)
:param src: Input 8-bit 3-channel image.
:param dst: Output image with the same size and type as ``src``.
:param sigma_s: Range between 0 to 200.
:param sigma_r: Range between 0 to 1.
pencilSketch
------------
Pencil-like non-photorealistic line drawing
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.. ocv:function:: void pencilSketch(InputArray src, OutputArray dst1, OutputArray dst2, float sigma_s = 60, float sigma_r = 0.07f, float shade_factor = 0.02f)
:param src: Input 8-bit 3-channel image.
:param dst1: Output 8-bit 1-channel image.
:param dst2: Output image with the same size and type as ``src``.
:param sigma_s: Range between 0 to 200.
:param sigma_r: Range between 0 to 1.
:param shade_factor: Range between 0 to 0.1.
stylization
-----------
Stylization aims to produce digital imagery with a wide variety of effects not focused on photorealism. Edge-aware filters are ideal for stylization, as they can abstract regions of low contrast while preserving, or enhancing, high-contrast features.
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.. ocv:function:: void stylization(InputArray src, OutputArray dst, float sigma_s = 60, float sigma_r = 0.45f)
:param src: Input 8-bit 3-channel image.
:param dst: Output image with the same size and type as ``src``.
:param sigma_s: Range between 0 to 200.
:param sigma_r: Range between 0 to 1.