// This file is part of OpenCV project.
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// It is subject to the license terms in the LICENSE file found in the top-level directory
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// of this distribution and at http://opencv.org/license.html.
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/*
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Ridge Detection Filter.
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OpenCV port by : Kushal Vyas (@kushalvyas), Venkatesh Vijaykumar(@venkateshvijaykumar)
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Adapted from Niki Estner's explaination of RidgeFilter.
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*/
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#ifndef __OPENCV_XIMGPROC_RIDGEFILTER_HPP__
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#define __OPENCV_XIMGPROC_RIDGEFILTER_HPP__
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#include <opencv2/core.hpp>
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namespace cv { namespace ximgproc {
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//! @addtogroup ximgproc_filters
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//! @{
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/** @brief Applies Ridge Detection Filter to an input image.
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Implements Ridge detection similar to the one in [Mathematica](http://reference.wolfram.com/language/ref/RidgeFilter.html)
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using the eigen values from the Hessian Matrix of the input image using Sobel Derivatives.
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Additional refinement can be done using Skeletonization and Binarization. Adapted from @cite segleafvein and @cite M_RF
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*/
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class CV_EXPORTS_W RidgeDetectionFilter : public Algorithm
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{
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public:
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/**
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@brief Create pointer to the Ridge detection filter.
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@param ddepth Specifies output image depth. Defualt is CV_32FC1
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@param dx Order of derivative x, default is 1
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@param dy Order of derivative y, default is 1
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@param ksize Sobel kernel size , default is 3
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@param out_dtype Converted format for output, default is CV_8UC1
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@param scale Optional scale value for derivative values, default is 1
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@param delta Optional bias added to output, default is 0
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@param borderType Pixel extrapolation method, default is BORDER_DEFAULT
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@see Sobel, threshold, getStructuringElement, morphologyEx.( for additional refinement)
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*/
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CV_WRAP static Ptr<RidgeDetectionFilter> create(int ddepth = CV_32FC1, int dx=1, int dy=1, int ksize = 3, int out_dtype=CV_8UC1, double scale = 1, double delta = 0, int borderType = BORDER_DEFAULT);
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/**
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@brief Apply Ridge detection filter on input image.
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@param _img InputArray as supported by Sobel. img can be 1-Channel or 3-Channels.
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@param out OutputAray of structure as RidgeDetectionFilter::ddepth. Output image with ridges.
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*/
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CV_WRAP virtual void getRidgeFilteredImage(InputArray _img, OutputArray out) = 0;
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};
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//! @}
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}} // namespace
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#endif
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