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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.
// 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*/
#include "precomp.hpp"
using namespace cv;
using namespace cv::cuda;
#if !defined (HAVE_CUDA) || defined (CUDA_DISABLER)
Ptr<cuda::HoughLinesDetector> cv::cuda::createHoughLinesDetector(float, float, int, bool, int) { throw_no_cuda(); return Ptr<HoughLinesDetector>(); }
#else /* !defined (HAVE_CUDA) */
namespace cv { namespace cuda { namespace device
{
namespace hough
{
int buildPointList_gpu(PtrStepSzb src, unsigned int* list);
}
namespace hough_lines
{
void linesAccum_gpu(const unsigned int* list, int count, PtrStepSzi accum, float rho, float theta, size_t sharedMemPerBlock, bool has20);
int linesGetResult_gpu(PtrStepSzi accum, float2* out, int* votes, int maxSize, float rho, float theta, int threshold, bool doSort);
}
}}}
namespace
{
class HoughLinesDetectorImpl : public HoughLinesDetector
{
public:
HoughLinesDetectorImpl(float rho, float theta, int threshold, bool doSort, int maxLines) :
rho_(rho), theta_(theta), threshold_(threshold), doSort_(doSort), maxLines_(maxLines)
{
}
void detect(InputArray src, OutputArray lines, Stream& stream);
void downloadResults(InputArray d_lines, OutputArray h_lines, OutputArray h_votes, Stream& stream);
void setRho(float rho) { rho_ = rho; }
float getRho() const { return rho_; }
void setTheta(float theta) { theta_ = theta; }
float getTheta() const { return theta_; }
void setThreshold(int threshold) { threshold_ = threshold; }
int getThreshold() const { return threshold_; }
void setDoSort(bool doSort) { doSort_ = doSort; }
bool getDoSort() const { return doSort_; }
void setMaxLines(int maxLines) { maxLines_ = maxLines; }
int getMaxLines() const { return maxLines_; }
void write(FileStorage& fs) const
{
fs << "name" << "HoughLinesDetector_CUDA"
<< "rho" << rho_
<< "theta" << theta_
<< "threshold" << threshold_
<< "doSort" << doSort_
<< "maxLines" << maxLines_;
}
void read(const FileNode& fn)
{
CV_Assert( String(fn["name"]) == "HoughLinesDetector_CUDA" );
rho_ = (float)fn["rho"];
theta_ = (float)fn["theta"];
threshold_ = (int)fn["threshold"];
doSort_ = (int)fn["doSort"] != 0;
maxLines_ = (int)fn["maxLines"];
}
private:
float rho_;
float theta_;
int threshold_;
bool doSort_;
int maxLines_;
GpuMat accum_;
GpuMat list_;
GpuMat result_;
};
void HoughLinesDetectorImpl::detect(InputArray _src, OutputArray lines, Stream& stream)
{
// TODO : implement async version
(void) stream;
using namespace cv::cuda::device::hough;
using namespace cv::cuda::device::hough_lines;
GpuMat src = _src.getGpuMat();
CV_Assert( src.type() == CV_8UC1 );
CV_Assert( src.cols < std::numeric_limits<unsigned short>::max() );
CV_Assert( src.rows < std::numeric_limits<unsigned short>::max() );
ensureSizeIsEnough(1, src.size().area(), CV_32SC1, list_);
unsigned int* srcPoints = list_.ptr<unsigned int>();
const int pointsCount = buildPointList_gpu(src, srcPoints);
if (pointsCount == 0)
{
lines.release();
return;
}
const int numangle = cvRound(CV_PI / theta_);
const int numrho = cvRound(((src.cols + src.rows) * 2 + 1) / rho_);
CV_Assert( numangle > 0 && numrho > 0 );
ensureSizeIsEnough(numangle + 2, numrho + 2, CV_32SC1, accum_);
accum_.setTo(Scalar::all(0));
DeviceInfo devInfo;
linesAccum_gpu(srcPoints, pointsCount, accum_, rho_, theta_, devInfo.sharedMemPerBlock(), devInfo.supports(FEATURE_SET_COMPUTE_20));
ensureSizeIsEnough(2, maxLines_, CV_32FC2, result_);
int linesCount = linesGetResult_gpu(accum_, result_.ptr<float2>(0), result_.ptr<int>(1), maxLines_, rho_, theta_, threshold_, doSort_);
if (linesCount == 0)
{
lines.release();
return;
}
result_.cols = linesCount;
result_.copyTo(lines);
}
void HoughLinesDetectorImpl::downloadResults(InputArray _d_lines, OutputArray h_lines, OutputArray h_votes, Stream& stream)
{
GpuMat d_lines = _d_lines.getGpuMat();
if (d_lines.empty())
{
h_lines.release();
if (h_votes.needed())
h_votes.release();
return;
}
CV_Assert( d_lines.rows == 2 && d_lines.type() == CV_32FC2 );
if (stream)
d_lines.row(0).download(h_lines, stream);
else
d_lines.row(0).download(h_lines);
if (h_votes.needed())
{
GpuMat d_votes(1, d_lines.cols, CV_32SC1, d_lines.ptr<int>(1));
if (stream)
d_votes.download(h_votes, stream);
else
d_votes.download(h_votes);
}
}
}
Ptr<HoughLinesDetector> cv::cuda::createHoughLinesDetector(float rho, float theta, int threshold, bool doSort, int maxLines)
{
return makePtr<HoughLinesDetectorImpl>(rho, theta, threshold, doSort, maxLines);
}
#endif /* !defined (HAVE_CUDA) */