mirror of https://github.com/opencv/opencv.git
Merge pull request #14888 from vchiluka5:NVIDIA_Optical_Flow
Alexander Alekhin
5 years ago
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GitHub
commit
8408587341
3 changed files with 49 additions and 264 deletions
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#include <iostream> |
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#include <fstream> |
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#include "opencv2/core.hpp" |
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#include <opencv2/core/utility.hpp> |
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#include "opencv2/highgui.hpp" |
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#include "opencv2/cudaoptflow.hpp" |
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#include "opencv2/cudaarithm.hpp" |
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using namespace std; |
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using namespace cv; |
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using namespace cv::cuda; |
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inline bool isFlowCorrect(Point2f u) |
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{ |
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return !cvIsNaN(u.x) && !cvIsNaN(u.y) && fabs(u.x) < 1e9 && fabs(u.y) < 1e9; |
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} |
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static Vec3b computeColor(float fx, float fy) |
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{ |
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static bool first = true; |
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// relative lengths of color transitions:
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// these are chosen based on perceptual similarity
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// (e.g. one can distinguish more shades between red and yellow
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// than between yellow and green)
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const int RY = 15; |
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const int YG = 6; |
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const int GC = 4; |
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const int CB = 11; |
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const int BM = 13; |
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const int MR = 6; |
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const int NCOLS = RY + YG + GC + CB + BM + MR; |
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static Vec3i colorWheel[NCOLS]; |
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if (first) |
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{ |
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int k = 0; |
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for (int i = 0; i < RY; ++i, ++k) |
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colorWheel[k] = Vec3i(255, 255 * i / RY, 0); |
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for (int i = 0; i < YG; ++i, ++k) |
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colorWheel[k] = Vec3i(255 - 255 * i / YG, 255, 0); |
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for (int i = 0; i < GC; ++i, ++k) |
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colorWheel[k] = Vec3i(0, 255, 255 * i / GC); |
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for (int i = 0; i < CB; ++i, ++k) |
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colorWheel[k] = Vec3i(0, 255 - 255 * i / CB, 255); |
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for (int i = 0; i < BM; ++i, ++k) |
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colorWheel[k] = Vec3i(255 * i / BM, 0, 255); |
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for (int i = 0; i < MR; ++i, ++k) |
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colorWheel[k] = Vec3i(255, 0, 255 - 255 * i / MR); |
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first = false; |
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} |
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const float rad = sqrt(fx * fx + fy * fy); |
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const float a = atan2(-fy, -fx) / (float) CV_PI; |
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const float fk = (a + 1.0f) / 2.0f * (NCOLS - 1); |
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const int k0 = static_cast<int>(fk); |
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const int k1 = (k0 + 1) % NCOLS; |
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const float f = fk - k0; |
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Vec3b pix; |
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for (int b = 0; b < 3; b++) |
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{ |
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const float col0 = colorWheel[k0][b] / 255.0f; |
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const float col1 = colorWheel[k1][b] / 255.0f; |
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float col = (1 - f) * col0 + f * col1; |
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if (rad <= 1) |
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col = 1 - rad * (1 - col); // increase saturation with radius
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else |
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col *= .75; // out of range
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pix[2 - b] = static_cast<uchar>(255.0 * col); |
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} |
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return pix; |
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} |
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static void drawOpticalFlow(const Mat_<float>& flowx, const Mat_<float>& flowy, Mat& dst, float maxmotion = -1) |
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{ |
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dst.create(flowx.size(), CV_8UC3); |
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dst.setTo(Scalar::all(0)); |
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// determine motion range:
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float maxrad = maxmotion; |
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if (maxmotion <= 0) |
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{ |
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maxrad = 1; |
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for (int y = 0; y < flowx.rows; ++y) |
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{ |
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for (int x = 0; x < flowx.cols; ++x) |
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{ |
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Point2f u(flowx(y, x), flowy(y, x)); |
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if (!isFlowCorrect(u)) |
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continue; |
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maxrad = max(maxrad, sqrt(u.x * u.x + u.y * u.y)); |
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} |
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} |
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} |
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for (int y = 0; y < flowx.rows; ++y) |
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{ |
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for (int x = 0; x < flowx.cols; ++x) |
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{ |
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Point2f u(flowx(y, x), flowy(y, x)); |
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if (isFlowCorrect(u)) |
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dst.at<Vec3b>(y, x) = computeColor(u.x / maxrad, u.y / maxrad); |
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} |
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} |
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} |
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static void showFlow(const char* name, const GpuMat& d_flow) |
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{ |
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GpuMat planes[2]; |
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cuda::split(d_flow, planes); |
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Mat flowx(planes[0]); |
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Mat flowy(planes[1]); |
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Mat out; |
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drawOpticalFlow(flowx, flowy, out, 10); |
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imshow(name, out); |
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} |
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int main(int argc, const char* argv[]) |
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{ |
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string filename1, filename2; |
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if (argc < 3) |
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{ |
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cerr << "Usage : " << argv[0] << " <frame0> <frame1>" << endl; |
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filename1 = "../data/basketball1.png"; |
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filename2 = "../data/basketball2.png"; |
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} |
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else |
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{ |
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filename1 = argv[1]; |
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filename2 = argv[2]; |
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} |
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Mat frame0 = imread(filename1, IMREAD_GRAYSCALE); |
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Mat frame1 = imread(filename2, IMREAD_GRAYSCALE); |
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if (frame0.empty()) |
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{ |
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cerr << "Can't open image [" << filename1 << "]" << endl; |
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return -1; |
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} |
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if (frame1.empty()) |
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{ |
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cerr << "Can't open image [" << filename2 << "]" << endl; |
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return -1; |
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} |
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if (frame1.size() != frame0.size()) |
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{ |
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cerr << "Images should be of equal sizes" << endl; |
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return -1; |
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} |
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GpuMat d_frame0(frame0); |
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GpuMat d_frame1(frame1); |
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GpuMat d_flow(frame0.size(), CV_32FC2); |
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Ptr<cuda::BroxOpticalFlow> brox = cuda::BroxOpticalFlow::create(0.197f, 50.0f, 0.8f, 10, 77, 10); |
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Ptr<cuda::DensePyrLKOpticalFlow> lk = cuda::DensePyrLKOpticalFlow::create(Size(7, 7)); |
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Ptr<cuda::FarnebackOpticalFlow> farn = cuda::FarnebackOpticalFlow::create(); |
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Ptr<cuda::OpticalFlowDual_TVL1> tvl1 = cuda::OpticalFlowDual_TVL1::create(); |
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{ |
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GpuMat d_frame0f; |
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GpuMat d_frame1f; |
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d_frame0.convertTo(d_frame0f, CV_32F, 1.0 / 255.0); |
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d_frame1.convertTo(d_frame1f, CV_32F, 1.0 / 255.0); |
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const int64 start = getTickCount(); |
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brox->calc(d_frame0f, d_frame1f, d_flow); |
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const double timeSec = (getTickCount() - start) / getTickFrequency(); |
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cout << "Brox : " << timeSec << " sec" << endl; |
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showFlow("Brox", d_flow); |
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} |
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{ |
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const int64 start = getTickCount(); |
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lk->calc(d_frame0, d_frame1, d_flow); |
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const double timeSec = (getTickCount() - start) / getTickFrequency(); |
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cout << "LK : " << timeSec << " sec" << endl; |
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showFlow("LK", d_flow); |
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} |
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{ |
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const int64 start = getTickCount(); |
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farn->calc(d_frame0, d_frame1, d_flow); |
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const double timeSec = (getTickCount() - start) / getTickFrequency(); |
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cout << "Farn : " << timeSec << " sec" << endl; |
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showFlow("Farn", d_flow); |
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} |
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{ |
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const int64 start = getTickCount(); |
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tvl1->calc(d_frame0, d_frame1, d_flow); |
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const double timeSec = (getTickCount() - start) / getTickFrequency(); |
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cout << "TVL1 : " << timeSec << " sec" << endl; |
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showFlow("TVL1", d_flow); |
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} |
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imshow("Frame 0", frame0); |
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imshow("Frame 1", frame1); |
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waitKey(); |
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return 0; |
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} |
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