Add Mobilenetv2 SSD Lite post and preprocessing, add mobilenet demo

Signed-off-by: xavier <micaelaverucchi@gmail.com>

demo/demo/demo_mobilenet.cpp

@@ -0,0 +1,93 @@
+#include <iostream>
+#include <signal.h>
+#include <stdlib.h> /* srand, rand */
+#include <unistd.h>
+#include <mutex>
+#include "utils.h"
+
+#include <opencv2/core/core.hpp>
+#include <opencv2/highgui/highgui.hpp>
+#include <opencv2/videoio.hpp>
+#include <opencv2/imgproc/imgproc.hpp>
+
+#include "MobilenetDetection.h"
+
+bool gRun;
+bool SAVE_RESULT = false;
+
+void sig_handler(int signo)
+{
+    std::cout << "request gateway stop\n";
+    gRun = false;
+}
+
+int main(int argc, char *argv[])
+{
+
+    std::cout << "detection\n";
+    signal(SIGINT, sig_handler);
+
+    char *net = "mobilenetv2ssd.rt";
+    if (argc > 1)
+        net = argv[1];
+    char *input = "../demo/yolo_test.mp4";
+    if (argc > 2)
+        input = argv[2];
+
+    tk::dnn::MobilenetDetection mbnet;
+    mbnet.init(net);
+
+    gRun = true;
+
+    cv::VideoCapture cap(input);
+    if (!cap.isOpened())
+        gRun = false;
+    else
+        std::cout << "camera started\n";
+
+    cv::VideoWriter resultVideo;
+    if (SAVE_RESULT)
+    {
+        int w = cap.get(cv::CAP_PROP_FRAME_WIDTH);
+        int h = cap.get(cv::CAP_PROP_FRAME_HEIGHT);
+        resultVideo.open("result.mp4", cv::VideoWriter::fourcc('M', 'P', '4', 'V'), 30, cv::Size(w, h));
+    }
+
+    cv::Mat frame;
+    cv::Mat dnn_input;
+    cv::namedWindow("detection", cv::WINDOW_NORMAL);
+
+    while (gRun)
+    {
+        cap >> frame;
+        if (!frame.data)
+        {
+            break;
+        }
+
+        // this will be resized to the net format
+        dnn_input = frame.clone();
+        // TODO: async infer
+        mbnet.update(dnn_input);
+        // draw dets
+        frame = mbnet.draw();
+
+        cv::imshow("detection", frame);
+        cv::waitKey(1);
+        if (SAVE_RESULT)
+            resultVideo << frame;
+    }
+
+    std::cout << "detection end\n";
+
+    std::cout << COL_GREENB << "\n\nTime stats:\n";
+    std::cout << "Min: " << *std::min_element(mbnet.stats.begin(), mbnet.stats.end()) << " ms\n";
+    std::cout << "Max: " << *std::max_element(mbnet.stats.begin(), mbnet.stats.end()) << " ms\n";
+    double mean = 0;
+    for (int i = 0; i < mbnet.stats.size(); i++)
+        mean += mbnet.stats[i];
+    mean /= mbnet.stats.size();
+    std::cout << "Avg: " << mean << " ms\n"
+              << COL_END;
+    return 0;
+}