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+/*M///////////////////////////////////////////////////////////////////////////////////////
+//
+// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
+// By downloading, copying, installing or using the software you agree to this license.
+// If you do not agree to this license, do not download, install,
+// copy or use the software.
+//
+//
+// License Agreement
+// For Open Source Computer Vision Library
+//
+// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
+// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
+// Copyright (C) 2013, OpenCV Foundation, all rights reserved.
+// Third party copyrights are property of their respective owners.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+// * Redistribution's of source code must retain the above copyright notice,
+// this list of conditions and the following disclaimer.
+//
+// * Redistribution's in binary form must reproduce the above copyright notice,
+// this list of conditions and the following disclaimer in the documentation
+// and/or other materials provided with the distribution.
+//
+// * The name of the copyright holders may not be used to endorse or promote products
+// derived from this software without specific prior written permission.
+//
+// This software is provided by the copyright holders and contributors "as is" and
+// any express or implied warranties, including, but not limited to, the implied
+// warranties of merchantability and fitness for a particular purpose are disclaimed.
+// In no event shall the Intel Corporation or contributors be liable for any direct,
+// indirect, incidental, special, exemplary, or consequential damages
+// (including, but not limited to, procurement of substitute goods or services;
+// loss of use, data, or profits; or business interruption) however caused
+// and on any theory of liability, whether in contract, strict liability,
+// or tort (including negligence or otherwise) arising in any way out of
+// the use of this software, even if advised of the possibility of such damage.
+//
+//M*/
+
+#ifndef __OPENCV_STEREO_HPP__
+#define __OPENCV_STEREO_HPP__
+
+#include "opencv2/core.hpp"
+#include "opencv2/features2d.hpp"
+#include "opencv2/core/affine.hpp"
+#include "opencv2/stereo/descriptor.hpp"
+#include "opencv2/stereo/matching.hpp"
+
+/**
+@defgroup stereo Stereo Correspondance Algorithms
+
+*/
+
+namespace cv
+{
+ namespace stereo
+ {
+ //! @addtogroup stereo
+ //! @{
+ // void correctMatches( InputArray F, InputArray points1, InputArray points2,
+ // OutputArray newPoints1, OutputArray newPoints2 );
+ /** @brief Filters off small noise blobs (speckles) in the disparity map
+ @param img The input 16-bit signed disparity image
+ @param newVal The disparity value used to paint-off the speckles
+ @param maxSpeckleSize The maximum speckle size to consider it a speckle. Larger blobs are not
+ affected by the algorithm
+ @param maxDiff Maximum difference between neighbor disparity pixels to put them into the same
+ blob. Note that since StereoBM, StereoSGBM and may be other algorithms return a fixed-point
+ disparity map, where disparity values are multiplied by 16, this scale factor should be taken into
+ account when specifying this parameter value.
+ @param buf The optional temporary buffer to avoid memory allocation within the function.
+ */
+ /** @brief The base class for stereo correspondence algorithms.
+ */
+ class StereoMatcher : public Algorithm
+ {
+ public:
+ enum { DISP_SHIFT = 4,
+ DISP_SCALE = (1 << DISP_SHIFT)
+ };
+
+ /** @brief Computes disparity map for the specified stereo pair
+
+ @param left Left 8-bit single-channel image.
+ @param right Right image of the same size and the same type as the left one.
+ @param disparity Output disparity map. It has the same size as the input images. Some algorithms,
+ like StereoBM or StereoSGBM compute 16-bit fixed-point disparity map (where each disparity value
+ has 4 fractional bits), whereas other algorithms output 32-bit floating-point disparity map.
+ */
+ virtual void compute( InputArray left, InputArray right,
+ OutputArray disparity ) = 0;
+
+ virtual int getMinDisparity() const = 0;
+ virtual void setMinDisparity(int minDisparity) = 0;
+
+ virtual int getNumDisparities() const = 0;
+ virtual void setNumDisparities(int numDisparities) = 0;
+
+ virtual int getBlockSize() const = 0;
+ virtual void setBlockSize(int blockSize) = 0;
+
+ virtual int getSpeckleWindowSize() const = 0;
+ virtual void setSpeckleWindowSize(int speckleWindowSize) = 0;
+
+ virtual int getSpeckleRange() const = 0;
+ virtual void setSpeckleRange(int speckleRange) = 0;
+
+ virtual int getDisp12MaxDiff() const = 0;
+ virtual void setDisp12MaxDiff(int disp12MaxDiff) = 0;
+
+ };
+ //!speckle removal algorithms. These algorithms have the purpose of removing small regions
+ enum {
+ CV_SPECKLE_REMOVAL_ALGORITHM, CV_SPECKLE_REMOVAL_AVG_ALGORITHM
+ };
+ //!subpixel interpolationm methods for disparities.
+ enum{
+ CV_QUADRATIC_INTERPOLATION, CV_SIMETRICV_INTERPOLATION
+ };
+ /** @brief Class for computing stereo correspondence using the block matching algorithm, introduced and
+ contributed to OpenCV by K. Konolige.
+ */
+ class StereoBinaryBM : public StereoMatcher
+ {
+ public:
+ enum { PREFILTER_NORMALIZED_RESPONSE = 0,
+ PREFILTER_XSOBEL = 1
+ };
+
+ virtual int getPreFilterType() const = 0;
+ virtual void setPreFilterType(int preFilterType) = 0;
+
+ virtual int getPreFilterSize() const = 0;
+ virtual void setPreFilterSize(int preFilterSize) = 0;
+
+ virtual int getPreFilterCap() const = 0;
+ virtual void setPreFilterCap(int preFilterCap) = 0;
+
+ virtual int getTextureThreshold() const = 0;
+ virtual void setTextureThreshold(int textureThreshold) = 0;
+
+ virtual int getUniquenessRatio() const = 0;
+ virtual void setUniquenessRatio(int uniquenessRatio) = 0;
+
+ virtual int getSmallerBlockSize() const = 0;
+ virtual void setSmallerBlockSize(int blockSize) = 0;
+
+ virtual int getScalleFactor() const = 0 ;
+ virtual void setScalleFactor(int factor) = 0;
+
+ virtual int getSpekleRemovalTechnique() const = 0 ;
+ virtual void setSpekleRemovalTechnique(int factor) = 0;
+
+ virtual bool getUsePrefilter() const = 0 ;
+ virtual void setUsePrefilter(bool factor) = 0;
+
+ virtual int getBinaryKernelType() const = 0;
+ virtual void setBinaryKernelType(int value) = 0;
+
+ virtual int getAgregationWindowSize() const = 0;
+ virtual void setAgregationWindowSize(int value) = 0;
+ /** @brief Creates StereoBM object
+
+ @param numDisparities the disparity search range. For each pixel algorithm will find the best
+ disparity from 0 (default minimum disparity) to numDisparities. The search range can then be
+ shifted by changing the minimum disparity.
+ @param blockSize the linear size of the blocks compared by the algorithm. The size should be odd
+ (as the block is centered at the current pixel). Larger block size implies smoother, though less
+ accurate disparity map. Smaller block size gives more detailed disparity map, but there is higher
+ chance for algorithm to find a wrong correspondence.
+
+ The function create StereoBM object. You can then call StereoBM::compute() to compute disparity for
+ a specific stereo pair.
+ */
+ CV_EXPORTS static Ptr< cv::stereo::StereoBinaryBM > create(int numDisparities = 0, int blockSize = 9);
+ };
+
+ /** @brief The class implements the modified H. Hirschmuller algorithm @cite HH08 that differs from the original
+ one as follows:
+
+ - By default, the algorithm is single-pass, which means that you consider only 5 directions
+ instead of 8. Set mode=StereoSGBM::MODE_HH in createStereoSGBM to run the full variant of the
+ algorithm but beware that it may consume a lot of memory.
+ - The algorithm matches blocks, not individual pixels. Though, setting blockSize=1 reduces the
+ blocks to single pixels.
+ - Mutual information cost function is not implemented. Instead, a simpler Birchfield-Tomasi
+ sub-pixel metric from @cite BT98 is used. Though, the color images are supported as well.
+ - Some pre- and post- processing steps from K. Konolige algorithm StereoBM are included, for
+ example: pre-filtering (StereoBM::PREFILTER_XSOBEL type) and post-filtering (uniqueness
+ check, quadratic interpolation and speckle filtering).
+
+ @note
+ - (Python) An example illustrating the use of the StereoSGBM matching algorithm can be found
+ at opencv_source_code/samples/python2/stereo_match.py
+ */
+ class StereoBinarySGBM : public StereoMatcher
+ {
+ public:
+ enum
+ {
+ MODE_SGBM = 0,
+ MODE_HH = 1
+ };
+
+ virtual int getPreFilterCap() const = 0;
+ virtual void setPreFilterCap(int preFilterCap) = 0;
+
+ virtual int getUniquenessRatio() const = 0;
+ virtual void setUniquenessRatio(int uniquenessRatio) = 0;
+
+ virtual int getP1() const = 0;
+ virtual void setP1(int P1) = 0;
+
+ virtual int getP2() const = 0;
+ virtual void setP2(int P2) = 0;
+
+ virtual int getMode() const = 0;
+ virtual void setMode(int mode) = 0;
+
+ virtual int getSpekleRemovalTechnique() const = 0 ;
+ virtual void setSpekleRemovalTechnique(int factor) = 0;
+
+ virtual int getBinaryKernelType() const = 0;
+ virtual void setBinaryKernelType(int value) = 0;
+
+ virtual int getSubPixelInterpolationMethod() const = 0;
+ virtual void setSubPixelInterpolationMethod(int value) = 0;
+
+ /** @brief Creates StereoSGBM object
+
+ @param minDisparity Minimum possible disparity value. Normally, it is zero but sometimes
+ rectification algorithms can shift images, so this parameter needs to be adjusted accordingly.
+ @param numDisparities Maximum disparity minus minimum disparity. The value is always greater than
+ zero. In the current implementation, this parameter must be divisible by 16.
+ @param blockSize Matched block size. It must be an odd number \>=1 . Normally, it should be
+ somewhere in the 3..11 range.
+ @param P1 The first parameter controlling the disparity smoothness.This parameter is used for the case of slanted surfaces (not fronto parallel).
+ @param P2 The second parameter controlling the disparity smoothness.This parameter is used for "solving" the depth discontinuities problem.
+ The larger the values are, the smoother the disparity is. P1 is the penalty on the disparity change by plus or minus 1
+ between neighbor pixels. P2 is the penalty on the disparity change by more than 1 between neighbor
+ pixels. The algorithm requires P2 \> P1 . See stereo_match.cpp sample where some reasonably good
+ P1 and P2 values are shown (like 8\*number_of_image_channels\*SADWindowSize\*SADWindowSize and
+ 32\*number_of_image_channels\*SADWindowSize\*SADWindowSize , respectively).
+ @param disp12MaxDiff Maximum allowed difference (in integer pixel units) in the left-right
+ disparity check. Set it to a non-positive value to disable the check.
+ @param preFilterCap Truncation value for the prefiltered image pixels. The algorithm first
+ computes x-derivative at each pixel and clips its value by [-preFilterCap, preFilterCap] interval.
+ The result values are passed to the Birchfield-Tomasi pixel cost function.
+ @param uniquenessRatio Margin in percentage by which the best (minimum) computed cost function
+ value should "win" the second best value to consider the found match correct. Normally, a value
+ within the 5-15 range is good enough.
+ @param speckleWindowSize Maximum size of smooth disparity regions to consider their noise speckles
+ and invalidate. Set it to 0 to disable speckle filtering. Otherwise, set it somewhere in the
+ 50-200 range.
+ @param speckleRange Maximum disparity variation within each connected component. If you do speckle
+ filtering, set the parameter to a positive value, it will be implicitly multiplied by 16.
+ Normally, 1 or 2 is good enough.
+ @param mode Set it to StereoSGBM::MODE_HH to run the full-scale two-pass dynamic programming
+ algorithm. It will consume O(W\*H\*numDisparities) bytes, which is large for 640x480 stereo and
+ huge for HD-size pictures. By default, it is set to false .
+
+ The first constructor initializes StereoSGBM with all the default parameters. So, you only have to
+ set StereoSGBM::numDisparities at minimum. The second constructor enables you to set each parameter
+ to a custom value.
+ */
+ CV_EXPORTS static Ptr<cv::stereo::StereoBinarySGBM> create(int minDisparity, int numDisparities, int blockSize,
+ int P1 = 100, int P2 = 1000, int disp12MaxDiff = 1,
+ int preFilterCap = 0, int uniquenessRatio = 5,
+ int speckleWindowSize = 400, int speckleRange = 200,
+ int mode = StereoBinarySGBM::MODE_SGBM);
+ };
+ //! @}
+ }//stereo
+} // cv
+
+#endif