openpose/examples/tutorial_api_cpp/04_keypoints_from_images.cpp

// ----------------------- OpenPose C++ API Tutorial - Example 4 - Body from images ----------------------
// It reads images, process them, and display them with the pose (and optionally hand and face) keypoints. In addition,
// it includes all the OpenPose configuration flags (enable/disable hand, face, output saving, etc.).

// Third-party dependencies
#include <opencv2/opencv.hpp>
// Command-line user interface
#define OPENPOSE_FLAGS_DISABLE_PRODUCER
#define OPENPOSE_FLAGS_DISABLE_DISPLAY
#include <openpose/flags.hpp>
// OpenPose dependencies
#include <openpose/headers.hpp>

// Custom OpenPose flags
// Producer
DEFINE_string(image_dir, "examples/media/",
 "Process a directory of images. Read all standard formats (jpg, png, bmp, etc.).");
// Display
DEFINE_bool(no_display, false,
 "Enable to disable the visual display.");

// This worker will just read and return all the jpg files in a directory
bool display(const std::shared_ptr<std::vector<std::shared_ptr<op::Datum>>>& datumsPtr)
{
 try
 {
 // User's displaying/saving/other processing here
 // datum.cvOutputData: rendered frame with pose or heatmaps
 // datum.poseKeypoints: Array<float> with the estimated pose
 if (datumsPtr != nullptr && !datumsPtr->empty())
 {
 // Display image and sleeps at least 1 ms (it usually sleeps ~5-10 msec to display the image)
 const cv::Mat cvMat = OP_OP2CVCONSTMAT(datumsPtr->at(0)->cvOutputData);
 if (!cvMat.empty())
 cv::imshow(OPEN_POSE_NAME_AND_VERSION + " - Tutorial C++ API", cvMat);
 else
 op::opLog("Empty cv::Mat as output.", op::Priority::High, __LINE__, __FUNCTION__, __FILE__);
 }
 else
 op::opLog("Nullptr or empty datumsPtr found.", op::Priority::High);
 const auto key = (char)cv::waitKey(1);
 return (key == 27);
 }
 catch (const std::exception& e)
 {
 op::error(e.what(), __LINE__, __FUNCTION__, __FILE__);
 return true;
 }
}

void printKeypoints(const std::shared_ptr<std::vector<std::shared_ptr<op::Datum>>>& datumsPtr)
{
 try
 {
 // Example: How to use the pose keypoints
 if (datumsPtr != nullptr && !datumsPtr->empty())
 {
 op::opLog("Body keypoints: " + datumsPtr->at(0)->poseKeypoints.toString(), op::Priority::High);
 op::opLog("Face keypoints: " + datumsPtr->at(0)->faceKeypoints.toString(), op::Priority::High);
 op::opLog("Left hand keypoints: " + datumsPtr->at(0)->handKeypoints[0].toString(), op::Priority::High);
 op::opLog("Right hand keypoints: " + datumsPtr->at(0)->handKeypoints[1].toString(), op::Priority::High);
 }
 else
 op::opLog("Nullptr or empty datumsPtr found.", op::Priority::High);
 }
 catch (const std::exception& e)
 {
 op::error(e.what(), __LINE__, __FUNCTION__, __FILE__);
 }
}

void configureWrapper(op::Wrapper& opWrapper)
{
 try
 {
 // Configuring OpenPose

 // logging_level
 op::checkBool(
 0 <= FLAGS_logging_level && FLAGS_logging_level <= 255, "Wrong logging_level value.",
 __LINE__, __FUNCTION__, __FILE__);
 op::ConfigureLog::setPriorityThreshold((op::Priority)FLAGS_logging_level);
 op::Profiler::setDefaultX(FLAGS_profile_speed);

 // Applying user defined configuration - GFlags to program variables
 // outputSize
 const auto outputSize = op::flagsToPoint(op::String(FLAGS_output_resolution), "-1x-1");
 // netInputSize
 const auto netInputSize = op::flagsToPoint(op::String(FLAGS_net_resolution), "-1x368");
 // faceNetInputSize
 const auto faceNetInputSize = op::flagsToPoint(op::String(FLAGS_face_net_resolution), "368x368 (multiples of 16)");
 // handNetInputSize
 const auto handNetInputSize = op::flagsToPoint(op::String(FLAGS_hand_net_resolution), "368x368 (multiples of 16)");
 // poseMode
 const auto poseMode = op::flagsToPoseMode(FLAGS_body);
 // poseModel
 const auto poseModel = op::flagsToPoseModel(op::String(FLAGS_model_pose));
 // JSON saving
 if (!FLAGS_write_keypoint.empty())
 op::opLog(
 "Flag `write_keypoint` is deprecated and will eventually be removed. Please, use `write_json`"
 " instead.", op::Priority::Max);
 // keypointScaleMode
 const auto keypointScaleMode = op::flagsToScaleMode(FLAGS_keypoint_scale);
 // heatmaps to add
 const auto heatMapTypes = op::flagsToHeatMaps(FLAGS_heatmaps_add_parts, FLAGS_heatmaps_add_bkg,
 FLAGS_heatmaps_add_PAFs);
 const auto heatMapScaleMode = op::flagsToHeatMapScaleMode(FLAGS_heatmaps_scale);
 // >1 camera view?
 const auto multipleView = (FLAGS_3d || FLAGS_3d_views > 1);
 // Face and hand detectors
 const auto faceDetector = op::flagsToDetector(FLAGS_face_detector);
 const auto handDetector = op::flagsToDetector(FLAGS_hand_detector);
 // Enabling Google Logging
 const bool enableGoogleLogging = true;

 // Pose configuration (use WrapperStructPose{} for default and recommended configuration)
 const op::WrapperStructPose wrapperStructPose{
 poseMode, netInputSize, FLAGS_net_resolution_dynamic, outputSize, keypointScaleMode, FLAGS_num_gpu,
 FLAGS_num_gpu_start, FLAGS_scale_number, (float)FLAGS_scale_gap,
 op::flagsToRenderMode(FLAGS_render_pose, multipleView), poseModel, !FLAGS_disable_blending,
 (float)FLAGS_alpha_pose, (float)FLAGS_alpha_heatmap, FLAGS_part_to_show, op::String(FLAGS_model_folder),
 heatMapTypes, heatMapScaleMode, FLAGS_part_candidates, (float)FLAGS_render_threshold,
 FLAGS_number_people_max, FLAGS_maximize_positives, FLAGS_fps_max, op::String(FLAGS_prototxt_path),
 op::String(FLAGS_caffemodel_path), (float)FLAGS_upsampling_ratio, enableGoogleLogging};
 opWrapper.configure(wrapperStructPose);
 // Face configuration (use op::WrapperStructFace{} to disable it)
 const op::WrapperStructFace wrapperStructFace{
 FLAGS_face, faceDetector, faceNetInputSize,
 op::flagsToRenderMode(FLAGS_face_render, multipleView, FLAGS_render_pose),
 (float)FLAGS_face_alpha_pose, (float)FLAGS_face_alpha_heatmap, (float)FLAGS_face_render_threshold};
 opWrapper.configure(wrapperStructFace);
 // Hand configuration (use op::WrapperStructHand{} to disable it)
 const op::WrapperStructHand wrapperStructHand{
 FLAGS_hand, handDetector, handNetInputSize, FLAGS_hand_scale_number, (float)FLAGS_hand_scale_range,
 op::flagsToRenderMode(FLAGS_hand_render, multipleView, FLAGS_render_pose), (float)FLAGS_hand_alpha_pose,
 (float)FLAGS_hand_alpha_heatmap, (float)FLAGS_hand_render_threshold};
 opWrapper.configure(wrapperStructHand);
 // Extra functionality configuration (use op::WrapperStructExtra{} to disable it)
 const op::WrapperStructExtra wrapperStructExtra{
 FLAGS_3d, FLAGS_3d_min_views, FLAGS_identification, FLAGS_tracking, FLAGS_ik_threads};
 opWrapper.configure(wrapperStructExtra);
 // Output (comment or use default argument to disable any output)
 const op::WrapperStructOutput wrapperStructOutput{
 FLAGS_cli_verbose, op::String(FLAGS_write_keypoint), op::stringToDataFormat(FLAGS_write_keypoint_format),
 op::String(FLAGS_write_json), op::String(FLAGS_write_coco_json), FLAGS_write_coco_json_variants,
 FLAGS_write_coco_json_variant, op::String(FLAGS_write_images), op::String(FLAGS_write_images_format),
 op::String(FLAGS_write_video), FLAGS_write_video_fps, FLAGS_write_video_with_audio,
 op::String(FLAGS_write_heatmaps), op::String(FLAGS_write_heatmaps_format), op::String(FLAGS_write_video_3d),
 op::String(FLAGS_write_video_adam), op::String(FLAGS_write_bvh), op::String(FLAGS_udp_host),
 op::String(FLAGS_udp_port)};
 opWrapper.configure(wrapperStructOutput);
 // No GUI. Equivalent to: opWrapper.configure(op::WrapperStructGui{});
 // Set to single-thread (for sequential processing and/or debugging and/or reducing latency)
 if (FLAGS_disable_multi_thread)
 opWrapper.disableMultiThreading();
 }
 catch (const std::exception& e)
 {
 op::error(e.what(), __LINE__, __FUNCTION__, __FILE__);
 }
}

int tutorialApiCpp()
{
 try
 {
 op::opLog("Starting OpenPose demo...", op::Priority::High);
 const auto opTimer = op::getTimerInit();

 // Configuring OpenPose
 op::opLog("Configuring OpenPose...", op::Priority::High);
 op::Wrapper opWrapper{op::ThreadManagerMode::Asynchronous};
 configureWrapper(opWrapper);

 // Starting OpenPose
 op::opLog("Starting thread(s)...", op::Priority::High);
 opWrapper.start();

 // Read frames on directory
 const auto imagePaths = op::getFilesOnDirectory(FLAGS_image_dir, op::Extensions::Images);

 // Process and display images
 for (const auto& imagePath : imagePaths)
 {
 const cv::Mat cvImageToProcess = cv::imread(imagePath);
 const op::Matrix imageToProcess = OP_CV2OPCONSTMAT(cvImageToProcess);
 auto datumProcessed = opWrapper.emplaceAndPop(imageToProcess);
 if (datumProcessed != nullptr)
 {
 printKeypoints(datumProcessed);
 if (!FLAGS_no_display)
 {
 const auto userWantsToExit = display(datumProcessed);
 if (userWantsToExit)
 {
 op::opLog("User pressed Esc to exit demo.", op::Priority::High);
 break;
 }
 }
 }
 else
 op::opLog("Image " + imagePath + " could not be processed.", op::Priority::High);
 }

 // Measuring total time
 op::printTime(opTimer, "OpenPose demo successfully finished. Total time: ", " seconds.", op::Priority::High);

 // Return
 return 0;
 }
 catch (const std::exception&)
 {
 return -1;
 }
}

int main(int argc, char *argv[])
{
 // Parsing command line flags
 gflags::ParseCommandLineFlags(&argc, &argv, true);

 // Running tutorialApiCpp
 return tutorialApiCpp();
}