mirror of
https://github.com/opencv/opencv.git
synced 2024-12-05 09:49:12 +08:00
89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
#include <cmath>
|
|
#include <iostream>
|
|
|
|
#include "opencv2/core/core.hpp"
|
|
#include "opencv2/highgui/highgui.hpp"
|
|
#include "opencv2/imgproc/imgproc.hpp"
|
|
#include "opencv2/gpu/gpu.hpp"
|
|
|
|
using namespace std;
|
|
using namespace cv;
|
|
using namespace cv::gpu;
|
|
|
|
static void help()
|
|
{
|
|
cout << "This program demonstrates line finding with the Hough transform." << endl;
|
|
cout << "Usage:" << endl;
|
|
cout << "./gpu-example-houghlines <image_name>, Default is pic1.png\n" << endl;
|
|
}
|
|
|
|
int main(int argc, const char* argv[])
|
|
{
|
|
const string filename = argc >= 2 ? argv[1] : "pic1.png";
|
|
|
|
Mat src = imread(filename, IMREAD_GRAYSCALE);
|
|
if (src.empty())
|
|
{
|
|
help();
|
|
cout << "can not open " << filename << endl;
|
|
return -1;
|
|
}
|
|
|
|
Mat mask;
|
|
Canny(src, mask, 100, 200, 3);
|
|
|
|
Mat dst_cpu;
|
|
cvtColor(mask, dst_cpu, CV_GRAY2BGR);
|
|
Mat dst_gpu = dst_cpu.clone();
|
|
|
|
vector<Vec4i> lines_cpu;
|
|
{
|
|
const int64 start = getTickCount();
|
|
|
|
HoughLinesP(mask, lines_cpu, 1, CV_PI / 180, 50, 60, 5);
|
|
|
|
const double timeSec = (getTickCount() - start) / getTickFrequency();
|
|
cout << "CPU Time : " << timeSec * 1000 << " ms" << endl;
|
|
cout << "CPU Found : " << lines_cpu.size() << endl;
|
|
}
|
|
|
|
for (size_t i = 0; i < lines_cpu.size(); ++i)
|
|
{
|
|
Vec4i l = lines_cpu[i];
|
|
line(dst_cpu, Point(l[0], l[1]), Point(l[2], l[3]), Scalar(0, 0, 255), 3, CV_AA);
|
|
}
|
|
|
|
GpuMat d_src(mask);
|
|
GpuMat d_lines;
|
|
HoughLinesBuf d_buf;
|
|
{
|
|
const int64 start = getTickCount();
|
|
|
|
gpu::HoughLinesP(d_src, d_lines, d_buf, 1.0f, (float) (CV_PI / 180.0f), 50, 5);
|
|
|
|
const double timeSec = (getTickCount() - start) / getTickFrequency();
|
|
cout << "GPU Time : " << timeSec * 1000 << " ms" << endl;
|
|
cout << "GPU Found : " << d_lines.cols << endl;
|
|
}
|
|
vector<Vec4i> lines_gpu;
|
|
if (!d_lines.empty())
|
|
{
|
|
lines_gpu.resize(d_lines.cols);
|
|
Mat h_lines(1, d_lines.cols, CV_32SC4, &lines_gpu[0]);
|
|
d_lines.download(h_lines);
|
|
}
|
|
|
|
for (size_t i = 0; i < lines_gpu.size(); ++i)
|
|
{
|
|
Vec4i l = lines_gpu[i];
|
|
line(dst_gpu, Point(l[0], l[1]), Point(l[2], l[3]), Scalar(0, 0, 255), 3, CV_AA);
|
|
}
|
|
|
|
imshow("source", src);
|
|
imshow("detected lines [CPU]", dst_cpu);
|
|
imshow("detected lines [GPU]", dst_gpu);
|
|
waitKey();
|
|
|
|
return 0;
|
|
}
|