90 lines
2.3 KiB
C++
90 lines
2.3 KiB
C++
#include <cmath>
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#include <iostream>
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#include "opencv2/core/core.hpp"
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#include "opencv2/highgui/highgui.hpp"
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#include "opencv2/imgproc/imgproc.hpp"
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#include "opencv2/gpu/gpu.hpp"
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using namespace std;
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using namespace cv;
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using namespace cv::gpu;
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static void help()
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{
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cout << "This program demonstrates line finding with the Hough transform." << endl;
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cout << "Usage:" << endl;
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cout << "./gpu-example-houghlines <image_name>, Default is pic1.png\n" << endl;
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}
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int main(int argc, const char* argv[])
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{
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const string filename = argc >= 2 ? argv[1] : "pic1.png";
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Mat src = imread(filename, IMREAD_GRAYSCALE);
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if (src.empty())
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{
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help();
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cout << "can not open " << filename << endl;
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return -1;
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}
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Mat mask;
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Canny(src, mask, 100, 200, 3);
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Mat dst_cpu;
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cvtColor(mask, dst_cpu, CV_GRAY2BGR);
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Mat dst_gpu = dst_cpu.clone();
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vector<Vec4i> lines_cpu;
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{
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const int64 start = getTickCount();
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HoughLinesP(mask, lines_cpu, 1, CV_PI / 180, 50, 60, 5);
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const double timeSec = (getTickCount() - start) / getTickFrequency();
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cout << "CPU Time : " << timeSec * 1000 << " ms" << endl;
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cout << "CPU Found : " << lines_cpu.size() << endl;
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}
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for (size_t i = 0; i < lines_cpu.size(); ++i)
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{
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Vec4i l = lines_cpu[i];
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line(dst_cpu, Point(l[0], l[1]), Point(l[2], l[3]), Scalar(0, 0, 255), 3, CV_AA);
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}
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GpuMat d_src(mask);
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GpuMat d_lines;
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HoughLinesBuf d_buf;
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{
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const int64 start = getTickCount();
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gpu::HoughLinesP(d_src, d_lines, d_buf, 1.0f, (float) (CV_PI / 180.0f), 50, 5);
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const double timeSec = (getTickCount() - start) / getTickFrequency();
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cout << "GPU Time : " << timeSec * 1000 << " ms" << endl;
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cout << "GPU Found : " << d_lines.cols << endl;
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}
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vector<Vec4i> lines_gpu;
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if (!d_lines.empty())
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{
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lines_gpu.resize(d_lines.cols);
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Mat h_lines(1, d_lines.cols, CV_32SC4, &lines_gpu[0]);
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d_lines.download(h_lines);
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}
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for (size_t i = 0; i < lines_gpu.size(); ++i)
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{
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Vec4i l = lines_gpu[i];
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line(dst_gpu, Point(l[0], l[1]), Point(l[2], l[3]), Scalar(0, 0, 255), 3, CV_AA);
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}
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imshow("source", src);
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imshow("detected lines [CPU]", dst_cpu);
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imshow("detected lines [GPU]", dst_gpu);
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waitKey();
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return 0;
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}
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