| OpenCV 3.4.3 Open Source Computer Vision

samples/dnn/openpose.cpp
//
// this sample demonstrates the use of pretrained openpose networks with opencv's dnn module.
//
// it can be used for body pose detection, using either the COCO model(18 parts):
// http://posefs1.perception.cs.cmu.edu/OpenPose/models/pose/coco/pose_iter_440000.caffemodel
// https://raw.githubusercontent.com/opencv/opencv_extra/master/testdata/dnn/openpose_pose_coco.prototxt
//
// or the MPI model(16 parts):
// http://posefs1.perception.cs.cmu.edu/OpenPose/models/pose/mpi/pose_iter_160000.caffemodel
// https://raw.githubusercontent.com/opencv/opencv_extra/master/testdata/dnn/openpose_pose_mpi_faster_4_stages.prototxt
//
// (to simplify this sample, the body models are restricted to a single person.)
//
//
// you can also try the hand pose model:
// http://posefs1.perception.cs.cmu.edu/OpenPose/models/hand/pose_iter_102000.caffemodel
// https://raw.githubusercontent.com/CMU-Perceptual-Computing-Lab/openpose/master/models/hand/pose_deploy.prototxt
//
#include <opencv2/dnn.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/highgui.hpp>
using namespace cv;
using namespace cv::dnn;
#include <iostream>
using namespace std;
// connection table, in the format [model_id][pair_id][from/to]
// please look at the nice explanation at the bottom of:
// https://github.com/CMU-Perceptual-Computing-Lab/openpose/blob/master/doc/output.md
//
const int POSE_PAIRS[3][20][2] = {
{ // COCO body
{1,2}, {1,5}, {2,3},
{3,4}, {5,6}, {6,7},
{1,8}, {8,9}, {9,10},
{1,11}, {11,12}, {12,13},
{1,0}, {0,14},
{14,16}, {0,15}, {15,17}
},
{ // MPI body
{0,1}, {1,2}, {2,3},
{3,4}, {1,5}, {5,6},
{6,7}, {1,14}, {14,8}, {8,9},
{9,10}, {14,11}, {11,12}, {12,13}
},
{ // hand
{0,1}, {1,2}, {2,3}, {3,4}, // thumb
{0,5}, {5,6}, {6,7}, {7,8}, // pinkie
{0,9}, {9,10}, {10,11}, {11,12}, // middle
{0,13}, {13,14}, {14,15}, {15,16}, // ring
{0,17}, {17,18}, {18,19}, {19,20} // small
}};
int main(int argc, char **argv)
{
CommandLineParser parser(argc, argv,
"{ h help | false | print this help message }"
"{ p proto | | (required) model configuration, e.g. hand/pose.prototxt }"
"{ m model | | (required) model weights, e.g. hand/pose_iter_102000.caffemodel }"
"{ i image | | (required) path to image file (containing a single person, or hand) }"
"{ width | 368 | Preprocess input image by resizing to a specific width. }"
"{ height | 368 | Preprocess input image by resizing to a specific height. }"
"{ t threshold | 0.1 | threshold or confidence value for the heatmap }"
);
String modelTxt = parser.get<string>("proto");
String modelBin = parser.get<string>("model");
String imageFile = parser.get<String>("image");
int W_in = parser.get<int>("width");
int H_in = parser.get<int>("height");
float thresh = parser.get<float>("threshold");
if (parser.get<bool>("help") || modelTxt.empty() || modelBin.empty() || imageFile.empty())
{
cout << "A sample app to demonstrate human or hand pose detection with a pretrained OpenPose dnn." << endl;
parser.printMessage();
return 0;
}
// read the network model
Net net = readNetFromCaffe(modelTxt, modelBin);
// and the image
Mat img = imread(imageFile);
if (img.empty())
{
std::cerr << "Can't read image from the file: " << imageFile << std::endl;
exit(-1);
}
// send it through the network
Mat inputBlob = blobFromImage(img, 1.0 / 255, Size(W_in, H_in), Scalar(0, 0, 0), false, false);
net.setInput(inputBlob);
Mat result = net.forward();
// the result is an array of "heatmaps", the probability of a body part being in location x,y
int midx, npairs;
int nparts = result.size[1];
int H = result.size[2];
int W = result.size[3];
// find out, which model we have
if (nparts == 19)
{ // COCO body
midx = 0;
npairs = 17;
nparts = 18; // skip background
}
else if (nparts == 16)
{ // MPI body
midx = 1;
npairs = 14;
}
else if (nparts == 22)
{ // hand
midx = 2;
npairs = 20;
}
else
{
cerr << "there should be 19 parts for the COCO model, 16 for MPI, or 22 for the hand one, but this model has " << nparts << " parts." << endl;
return (0);
}
// find the position of the body parts
vector<Point> points(22);
for (int n=0; n<nparts; n++)
{
// Slice heatmap of corresponding body's part.
Mat heatMap(H, W, CV_32F, result.ptr(0,n));
// 1 maximum per heatmap
Point p(-1,-1),pm;
double conf;
minMaxLoc(heatMap, 0, &conf, 0, &pm);
if (conf > thresh)
p = pm;
points[n] = p;
}
// connect body parts and draw it !
float SX = float(img.cols) / W;
float SY = float(img.rows) / H;
for (int n=0; n<npairs; n++)
{
// lookup 2 connected body/hand parts
Point2f a = points[POSE_PAIRS[midx][n][0]];
Point2f b = points[POSE_PAIRS[midx][n][1]];
// we did not find enough confidence before
if (a.x<=0 || a.y<=0 || b.x<=0 || b.y<=0)
continue;
// scale to image size
a.x*=SX; a.y*=SY;
b.x*=SX; b.y*=SY;
line(img, a, b, Scalar(0,200,0), 2);
circle(img, a, 3, Scalar(0,0,200), -1);
circle(img, b, 3, Scalar(0,0,200), -1);
}
imshow("OpenPose", img);
waitKey();
return 0;
}