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heatmap.cpp
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heatmap.cpp
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#include "utils.hpp"
#include "ezOptionParser.hpp"
#include <opencv2/opencv.hpp>
#include <vector>
#include <string>
#include <iostream>
using namespace cv;
using namespace std;
const char* g_window_title = "Heatmap";
// Options
int g_kernel_size = 75;
float g_fade_time = 2.0;
float g_kernel_intensity = 0.1;
float g_base_intensity = 0.1;
float g_max_transparency = 0.6;
bool g_linear_kernel = false;
bool g_realtime_playback = true;
bool g_print_progress = false;
bool g_show_video = true;
bool g_out_video = false;
string g_out_file;
string g_out_four_cc = "MJPG";
// Required arguments
string g_in_video;
string g_data_file;
Mat g_heatmap;
Mat g_kernel;
Mat g_ones;
Mat g_zeros;
Mat g_fade_mat;
vector<DataPoint> g_data;
// Following are in HSV format
Vec3b g_heat_color1 = Vec3b(0, 255, 255); // Red
Vec3b g_heat_color2 = Vec3b(170, 255, 255); // Blue
//============================================================================
// parse_arguments
//============================================================================
std::string get_usage(ez::ezOptionParser& eop)
{
string usage;
eop.getUsage(usage, 80, ez::ezOptionParser::ALIGN);
return usage;
}
bool parse_arguments(int argc, const char* argv[])
{
using namespace ez;
ezOptionParser opt;
opt.overview = "Create a heatmap overlay on a video";
opt.syntax = "heatmap [OPTIONS] video point_data";
opt.example = "heatmap my_video.avi mouse.txt\n";
ezOptionValidator* vUByte(new ezOptionValidator("u1", "gele", "0, 255"));
ezOptionValidator* v01Float(new ezOptionValidator("f", "gele", "0.0, 1.0"));
ezOptionValidator* vNonZeroFloat(new ezOptionValidator("f", "gt", "0.0"));
ezOptionValidator* vNonZeroInt(new ezOptionValidator("u4", "gt", "0"));
ezOptionValidator* vString(new ezOptionValidator("text"));
opt.add("75", 0, 1, 0, "Kernel size in pixels.", "-ks",
"--kernel-size", vNonZeroInt);
opt.add("2.0", 0, 1, 0, "Fade time in seconds. Supports floating values."
"Must be greater than zero.", "-ft",
"--fade-time", vNonZeroFloat);
opt.add("", 0, 0, 0, "Use a linear kernel instead of gaussian.",
"-l", "--linear");
opt.add("0.1", 0, 1, 0, "Base intensity, higher values saturate faster. [0-1]",
"-in", "--intensity", v01Float);
opt.add("170,255,255", 0, 3, ',', "Starting heat map color in HSV. [0-255]",
"-sc", "--start-color", vUByte);
opt.add("0,255,255", 0, 3, ',', "Ending heat map color in HSV. [0-255]",
"-ec", "--end-color", vUByte);
opt.add("0.6", 0, 1, 0, "Max alpha value for the overlay. [0-1]",
"-am", "--alpha-max", v01Float);
opt.add("", 0, 0, 0, "Play the video back as fast as possible.",
"-nw", "--no-wait");
opt.add("", 0, 0, 0, "Print percent progress while playing. "
"Updates in one percent increments.", "-pp", "--print-progress");
opt.add("", 0, 0, 0, "Don't show the video window. "
"Useful for creating an output video.", "-nv", "--no-video");
opt.add("", 0, 1, 0, "Write heat map video to a file.",
"-ov", "--out-video", vString);
opt.add("", 0, 1, 0, "Specify the FOURCC code for the output video. "
"Must be exactly four characters. Use quotes for whitespace.",
"-fc", "--four-cc", vString);
opt.parse(argc, argv);
if (opt.lastArgs.size() < 2)
{
cerr << "Missing required arguments\n";
cout << get_usage(opt);
return false;
}
vector<string> bad_options;
if (!opt.gotRequired(bad_options))
{
for (size_t i = 0; i < bad_options.size(); ++i)
{
cerr << "Missing option " << bad_options[i] << "\n";
}
cout << get_usage(opt);
return false;
}
if (!opt.gotExpected(bad_options))
{
for (size_t i = 0; i < bad_options.size(); ++i)
{
cerr << "Expected option " << bad_options[i] << "\n";
}
cout << get_usage(opt);
return false;
}
vector<string> bad_args;
if (!opt.gotValid(bad_options, bad_args))
{
for (size_t i = 0; i < bad_options.size(); ++i)
{
cerr << "Invalid option " << bad_options[i] << " "
<< bad_args[i] << "\n";
}
return false;
}
if (opt.isSet("-ov"))
{
opt.get("-ov")->getString(g_out_file);
g_out_video = true;
}
if (opt.isSet("-fc"))
{
opt.get("-fc")->getString(g_out_four_cc);
if (g_out_four_cc.length() != 4)
{
cerr << "FOURCC must be exactly four characters.\n";
return false;
}
if (!g_out_video)
{
cerr << "Output video file must be specified if specifying a FOURCC.\n";
return false;
}
}
// Simple flags
if (opt.isSet("-pp")) { g_print_progress = true; }
if (opt.isSet("-nv")) { g_show_video = false; }
if (opt.isSet("-nw")) { g_realtime_playback = false; }
if (opt.isSet("-ks")) { opt.get("-ks")->getInt(g_kernel_size); }
if (opt.isSet("-ft")) { opt.get("-ft")->getFloat(g_fade_time); }
if (opt.isSet("-l")) { g_linear_kernel = true; }
if (opt.isSet("-am")) { opt.get("-am")->getFloat(g_max_transparency); }
if (opt.isSet("-in")) { opt.get("-in")->getFloat(g_base_intensity); }
if (opt.isSet("-sc"))
{
vector<int> multi_int;
opt.get("-sc")->getInts(multi_int);
g_heat_color2 = Vec3b(multi_int[0], multi_int[1], multi_int[2]);
}
if (opt.isSet("-ec"))
{
vector<int> multi_int;
opt.get("-ec")->getInts(multi_int);
g_heat_color1 = Vec3b(multi_int[0], multi_int[1], multi_int[2]);
}
g_in_video = *opt.lastArgs[0];
g_data_file = *opt.lastArgs[1];
return true;
}
//============================================================================
// heat_point
//============================================================================
void heat_point(int x, int y)
{
// Make sure the coordinates are in bounds
if (x < 0 || y < 0 || x >= g_heatmap.cols || y >= g_heatmap.rows)
{
return;
}
// Only update a small portion of the matrix
const int g_kernel_half = g_kernel_size / 2;
const int fixed_x = x - g_kernel_half;
const int fixed_y = y - g_kernel_half;
const int roi_l = max(fixed_x, 0);
const int roi_t = max(fixed_y, 0);
const int roi_w = min(fixed_x + g_kernel_size, g_heatmap.cols) - roi_l;
const int roi_h = min(fixed_y + g_kernel_size, g_heatmap.rows) - roi_t;
Mat roi(g_heatmap(Rect(roi_l, roi_t, roi_w, roi_h)));
const int groi_l = roi_l - fixed_x;
const int groi_t = roi_t - fixed_y;
const int groi_w = roi_w;
const int groi_h = roi_h;
Mat roi_gauss(g_kernel(Rect(groi_l, groi_t, groi_w, groi_h)));
roi += roi_gauss;
}
//============================================================================
//
//============================================================================
// For debugging, moving the mouse on the screen will add heat
// map values to that location.
void mouse_event(int event, int x, int y, int, void*)
{
if (event == CV_EVENT_MOUSEMOVE)
{
heat_point(x, y);
}
}
//============================================================================
// decrease_heatmap
//============================================================================
/* Fades the entire heatmap by g_fade_mat amount.
*/
void decrease_heatmap()
{
// Fade some of the values in the matrix
g_heatmap -= g_fade_mat;
g_heatmap = max(g_zeros, g_heatmap);
}
//============================================================================
// overlay_heatmap
//============================================================================
/* Draws the heatmap on top of a frame. The frame must be the same size as
* the heatmap.
*/
void overlay_heatmap(Mat frame)
{
// Make sure all values are capped at one
g_heatmap = min(g_ones, g_heatmap);
Mat temp_map;
blur(g_heatmap, temp_map, Size(15, 15));
for (int r = 0; r < frame.rows; ++r)
{
Vec3b* f_ptr = frame.ptr<Vec3b>(r);
float* h_ptr = temp_map.ptr<float>(r);
for (int c = 0; c < frame.cols; ++c)
{
const float heat_mix = h_ptr[c];
if (heat_mix > 0.0)
{
// in BGR
const Vec3b i_color = f_ptr[c];
const Vec3b heat_color =
hsv_to_bgr(interpolate_hsv(g_heat_color2, g_heat_color1, heat_mix));
const float heat_mix2 = std::min(heat_mix, g_max_transparency);
const Vec3b final_color = interpolate(i_color, heat_color, heat_mix2);
f_ptr[c] = final_color;
}
}
}
}
//============================================================================
// create_kernel
//============================================================================
/* Create the heatmap kernel. This is applied when heat_point() is called.
*/
void create_kernel()
{
if (g_linear_kernel)
{
// Linear kernel
const float max_val = 1.0 * g_base_intensity;
const float min_val = 0.0;
const float interval = max_val - min_val;
const int center = g_kernel_size / 2 + 1;
const float radius = g_kernel_size / 2;
g_kernel = Mat::zeros(g_kernel_size, g_kernel_size, CV_32F);
for (int r = 0; r < g_kernel_size; ++r)
{
float* ptr = g_kernel.ptr<float>(r);
for (int c = 0; c < g_kernel_size; ++c)
{
// Calculate the distance from the center
const float diff_x = static_cast<float>(abs(r - center));
const float diff_y = static_cast<float>(abs(c - center));
const float length = sqrt(diff_x*diff_x + diff_y*diff_y);
if (length <= radius)
{
const float b = 1.0 - (length / radius);
const float val = b*interval + min_val;
ptr[c] = val;
}
}
}
}
else
{
// Gaussian kernel
Mat coeffs = getGaussianKernel(g_kernel_size, 0.0, CV_32F)*150*g_base_intensity;
g_kernel = coeffs * coeffs.t();
}
}
//============================================================================
// opencv_error_handler
//============================================================================
int opencv_error_handler(int, const char*, const char*, const char*, int, void*)
{
return 0;
}
//============================================================================
// main
//============================================================================
int main(int argc, const char* argv[])
{
if (!parse_arguments(argc, argv))
{
return 1;
}
// Open the video file
VideoCapture video(g_in_video);
if (!video.isOpened())
{
cerr << "Couldn't open video file\n";
return 2;
}
// Read the FPS
double fps = video.get(CV_CAP_PROP_FPS);
cout << "Video FPS: " << fps << "\n";
// Sometimes OpenCV reports an odd FPS value
if (fps > 60)
{
cerr << "Video FPS is too high or can't read correct FPS value\n";
return 3;
}
VideoWriter out_video;
if (g_out_video)
{
const int frame_w = static_cast<int>(video.get(CV_CAP_PROP_FRAME_WIDTH));
const int frame_h = static_cast<int>(video.get(CV_CAP_PROP_FRAME_HEIGHT));
Size S = Size(frame_w, frame_h);
try
{
// Make slightly more readable error messages
cvRedirectError(opencv_error_handler);
const int four_cc = CV_FOURCC(
g_out_four_cc[0], g_out_four_cc[1],
g_out_four_cc[2], g_out_four_cc[3]);
out_video.open(g_out_file, four_cc,
video.get(CV_CAP_PROP_FPS), S, true);
cvRedirectError(NULL);
}
catch (cv::Exception& ex)
{
cerr << "FOURCC code \"" + g_out_four_cc + "\" not supported: "
<< ex.err << "\n";
return 4;
}
}
// Read in the data
if (!parse_data_points(g_data_file, g_data))
{
cerr << "Couldn't read data file\n";
return 5;
}
cout << "Number of data points: " << g_data.size() << "\n";
// Setup the OpenCV window
if (g_show_video)
{
namedWindow(g_window_title, 1);
setMouseCallback(g_window_title, mouse_event, 0);
}
// Get initial video frame, so we can setup other matrices
Mat frame;
video >> frame;
g_heatmap = Mat::zeros(frame.rows, frame.cols, CV_32FC1);
g_ones = Mat::ones(frame.rows, frame.cols, CV_32F);
g_zeros = Mat::zeros(frame.rows, frame.cols, CV_32F);
g_fade_mat = Mat::ones(frame.rows, frame.cols, CV_32F);
// Determine how much to fade the heatmap values by each frame
g_fade_mat.setTo((1.0 / fps) / g_fade_time);
// Create heatmap kernel
create_kernel();
// For the OpenCV waitKey loop
int dt = static_cast<int>((1.0 / fps) * 1000);
if (!g_realtime_playback && g_show_video)
{
// We still have to call waitKey() if they want to see
// the video. This is because OpenCV does all the GUI
// updating when waitKey() is called.
dt = 1;
}
// For finding the next data point
const double frame_time = 1.0 / fps;
// The current data point
unsigned int data_index = 0;
// Global video time, used to sync the data
double global_time = 0;
int percentage = -1;
while (frame.data != NULL && data_index < g_data.size())
{
// Plot as many data points for this frame as we can
while (data_index < g_data.size() &&
g_data[data_index].timestamp <= global_time)
{
heat_point(g_data[data_index].px, g_data[data_index].py);
++data_index;
}
if (g_print_progress)
{
// How far through the video, could add a trackbar instead
int cur_percent = (data_index / (float)g_data.size()) * 100;
if (cur_percent > percentage)
{
cout << cur_percent << "%\n";
percentage = cur_percent;
}
}
// Draw the heatmap
overlay_heatmap(frame);
if (g_show_video)
{
imshow(g_window_title, frame);
}
decrease_heatmap();
if (g_out_video)
{
out_video << frame;
}
video >> frame;
global_time += frame_time;
if (g_realtime_playback || g_show_video)
{
char key = waitKey(dt);
if (key == 27 || key == 'q')
{
break;
}
}
}
return 0;
}
//============================================================================
//
//============================================================================