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 | 1 | initial version |
here a sample code ( modified version of opencv_annotation.cpp ) i hope it will be a referance to you.
#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/videoio.hpp>
#include <opencv2/imgproc.hpp>
#include <fstream>
#include <iostream>
using namespace std;
using namespace cv;
// Function prototypes
void on_mouse(int, int, int, int, void*);
string int2string(int);
void get_annotations(Mat, stringstream*);
// Public parameters
Mat image;
int roi_x0 = 0, roi_y0 = 0, roi_x1 = 0, roi_y1 = 0, num_of_rec = 0;
bool start_draw = false;
// Window name for visualisation purposes
const string window_name = "OpenCV Based Annotation Tool";
// FUNCTION : Mouse response for selecting objects in images
// If left button is clicked, start drawing a rectangle as long as mouse moves
// Stop drawing once a new left click is detected by the on_mouse function
void on_mouse(int event, int x, int y, int, void *)
{
// Action when left button is clicked
if (event == EVENT_LBUTTONDOWN)
{
if (!start_draw)
{
roi_x0 = x;
roi_y0 = y;
start_draw = true;
}
else {
roi_x1 = x;
roi_y1 = y;
start_draw = false;
}
}
// Action when mouse is moving
if ((event == EVENT_MOUSEMOVE) && start_draw)
{
// Redraw bounding box for annotation
Mat current_view;
image.copyTo(current_view);
rectangle(current_view, Point(roi_x0, roi_y0), Point(x, y), Scalar(0, 0, 255));
int radius = max(abs(roi_x0 - x), abs(roi_y0 - y) );
circle(current_view, Point(roi_x0, roi_y0), radius, Scalar(0, 255, 0), 1, 8);
imshow(window_name, current_view);
}
}
// FUNCTION : snippet to convert an integer value to a string using a clean function
// instead of creating a stringstream each time inside the main code
string int2string(int num)
{
stringstream temp_stream;
temp_stream << num;
return temp_stream.str();
}
void drawCircle(Mat input_image)
{
// Make it possible to exit the annotation
bool stop = false;
// Reset the num_of_rec element at each iteration
// Make sure the global image is set to the current image
num_of_rec = 0;
image = input_image;
// Init window interface and couple mouse actions
namedWindow(window_name, WINDOW_AUTOSIZE);
setMouseCallback(window_name, on_mouse);
imshow(window_name, image);
stringstream temp_stream;
int key_pressed = 0;
do
{
// Keys for processing
// You need to select one for confirming a selection and one to continue to the next image
// Based on the universal ASCII code of the keystroke: http://www.asciitable.com/
// c = 99 add rectangle to current image
// n = 110 save added rectangles and show next image
// <ESC> = 27 exit program
key_pressed = 0xFF & waitKey(0);
switch (key_pressed)
{
case 27:
destroyWindow(window_name);
stop = true;
case 99:
// Add a rectangle to the list
num_of_rec++;
// Draw initiated from top left corner
if (roi_x0<roi_x1 && roi_y0<roi_y1)
{
temp_stream << " " << int2string(roi_x0) << " " << int2string(roi_y0) << " " << int2string(roi_x1 - roi_x0) << " " << int2string(roi_y1 - roi_y0);
}
// Draw initiated from bottom right corner
if (roi_x0>roi_x1 && roi_y0>roi_y1)
{
temp_stream << " " << int2string(roi_x1) << " " << int2string(roi_y1) << " " << int2string(roi_x0 - roi_x1) << " " << int2string(roi_y0 - roi_y1);
}
// Draw initiated from top right corner
if (roi_x0>roi_x1 && roi_y0<roi_y1)
{
temp_stream << " " << int2string(roi_x1) << " " << int2string(roi_y0) << " " << int2string(roi_x0 - roi_x1) << " " << int2string(roi_y1 - roi_y0);
}
// Draw initiated from bottom left corner
if (roi_x0<roi_x1 && roi_y0>roi_y1)
{
temp_stream << " " << int2string(roi_x0) << " " << int2string(roi_y1) << " " << int2string(roi_x1 - roi_x0) << " " << int2string(roi_y0 - roi_y1);
}
rectangle(input_image, Point(roi_x0, roi_y0), Point(roi_x1, roi_y1), Scalar(0, 255, 0), 1);
break;
}
// Check if escape has been pressed
if (stop)
{
break;
}
}
// Continue as long as the next image key has not been pressed
while (key_pressed != 110);
// Close down the window
destroyWindow(window_name);
}
int main(int argc, const char** argv)
{
Mat current_image(600, 800, CV_8UC3, Scalar(220, 220, 220));
drawCircle(current_image);
return 0;
}
PS: i will simplify the code later
| | 2 | No.2 Revision |
here a sample code ( modified version of opencv_annotation.cpp ) i hope it will be a referance to you.
#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/videoio.hpp>
#include <opencv2/imgproc.hpp>
#include <fstream>
#include <iostream>
using namespace std;
using namespace cv;
// Function prototypes
void on_mouse(int, int, int, int, void*);
string int2string(int);
void get_annotations(Mat, stringstream*);
// Public parameters
Mat image;
image(600, 800, CV_8UC3, Scalar(220, 220, 220));
int roi_x0 = 0, roi_y0 = 0, roi_x1 = 0, roi_y1 = 0, num_of_rec = 0;
bool start_draw = false;
// Window name for visualisation purposes
const string window_name = "OpenCV Based Annotation Tool";
Mouse Event Demo";
// FUNCTION : Mouse response for selecting objects in images
// If left button is clicked, start drawing a rectangle and circle as long as mouse moves
// Stop drawing once a new left click is detected by the on_mouse function
void on_mouse(int event, int x, int y, int, void *)
{
// Action when left button is clicked
if (event == EVENT_LBUTTONDOWN)
{
if (!start_draw)
{
roi_x0 = x;
roi_y0 = y;
start_draw = true;
}
else {
roi_x1 = x;
roi_y1 = y;
start_draw = false;
}
}
// Action when mouse is moving
if ((event == EVENT_MOUSEMOVE) && start_draw)
{
// Redraw bounding box for annotation
and rectangle
Mat current_view;
image.copyTo(current_view);
rectangle(current_view, Point(roi_x0, roi_y0), Point(x, y), Scalar(0, 0, 255));
int radius = max(abs(roi_x0 - x), abs(roi_y0 - y) );
y));
circle(current_view, Point(roi_x0, roi_y0), radius, Scalar(0, 255, Scalar(255, 0, 0), 1, 8);
imshow(window_name, current_view);
}
}
// FUNCTION : snippet to convert an integer value to a string using a clean function
// instead of creating a stringstream each time inside the main code
string int2string(int num)
int main(int argc, const char** argv)
{
stringstream temp_stream;
temp_stream << num;
return temp_stream.str();
}
void drawCircle(Mat input_image)
{
// Make it possible to exit the annotation
bool stop = false;
// Reset the num_of_rec element at each iteration
// Make sure the global image is set to the current image
num_of_rec = 0;
image = input_image;
// Init window interface and couple mouse actions
namedWindow(window_name, WINDOW_AUTOSIZE);
setMouseCallback(window_name, on_mouse);
imshow(window_name, image);
stringstream temp_stream;
int key_pressed = 0;
do
{
// Keys for processing
// You need to select one for confirming a selection and one to continue to the next image
// Based on the universal ASCII code of the keystroke: http://www.asciitable.com/
// c = 99 add rectangle to current image
// n = 110 save added rectangles and show next image
// <ESC> = 27 exit program
key_pressed = 0xFF & waitKey(0);
switch (key_pressed)
if (key_pressed==99)
{
case 27:
destroyWindow(window_name);
stop = true;
case 99:
// Add a rectangle to the list
num_of_rec++;
// Draw initiated from top left corner
if (roi_x0<roi_x1 && roi_y0<roi_y1)
{
temp_stream << " " << int2string(roi_x0) << " " << int2string(roi_y0) << " " << int2string(roi_x1
int radius = max(abs(roi_x0 - roi_x0) << " " << int2string(roi_y1 roi_x1), abs(roi_y0 - roi_y0);
}
// Draw initiated from bottom right corner
if (roi_x0>roi_x1 && roi_y0>roi_y1)
{
temp_stream << " " << int2string(roi_x1) << " " << int2string(roi_y1) << " " << int2string(roi_x0 - roi_x1) << " " << int2string(roi_y0 - roi_y1);
}
// Draw initiated from top right corner
if (roi_x0>roi_x1 && roi_y0<roi_y1)
{
temp_stream << " " << int2string(roi_x1) << " " << int2string(roi_y0) << " " << int2string(roi_x0 - roi_x1) << " " << int2string(roi_y1 - roi_y0);
}
// Draw initiated from bottom left corner
if (roi_x0<roi_x1 && roi_y0>roi_y1)
{
temp_stream << " " << int2string(roi_x0) << " " << int2string(roi_y1) << " " << int2string(roi_x1 - roi_x0) << " " << int2string(roi_y0 - roi_y1);
}
rectangle(input_image, roi_y1));
circle(image, Point(roi_x0, roi_y0), radius, Scalar(0, 0, 255), 1, 8);
rectangle(image, Point(roi_x0, roi_y0), Point(roi_x1, roi_y1), Scalar(0, 255, 0), 1);
break;
}
// Check if escape has been pressed
if (stop)
{
break;
}
}
// Continue as long as the next image <ESC> key has not been pressed
while (key_pressed != 110);
27);
// Close down the window
destroyWindow(window_name);
}
int main(int argc, const char** argv)
{
Mat current_image(600, 800, CV_8UC3, Scalar(220, 220, 220));
drawCircle(current_image);
return 0;
}
PS: i will simplify the code later
| | 3 | No.3 Revision |
here a sample code ( modified version of opencv_annotation.cpp ) i hope it will be a referance to you.
//modified from https://github.com/Itseez/opencv/blob/master/apps/annotation/opencv_annotation.cpp
// move the mouse on the window and try left click and right click
#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
using namespace std;
using namespace cv;
// Function prototypes
void on_mouse(int, int, int, int, void*);
// Public parameters
Mat image(600, 800, CV_8UC3, Scalar(220, 220, 220));
vector<Point> points;
int roi_x0 = 0, roi_y0 = 0, roi_x1 = 0, roi_y1 = 0, num_of_rec = 0;
bool start_draw = false;
// Window name for visualisation purposes
const string window_name = "OpenCV Mouse Event Demo";
// FUNCTION : Mouse response for selecting objects in images
// If left button is clicked, start drawing a rectangle and circle as long as mouse moves
//If right button is clicked, look what will happen !
// Stop drawing once a new left click is detected by the on_mouse function
void on_mouse(int event, int x, int y, int, void *)
{
// Action when right button is clicked
if (event == EVENT_RBUTTONDOWN)
{
points.push_back(Point(x, y));
circle(image, Point(x, y), 5, Scalar(255, 255, 255), 1, 8);
if (points.size() == 3)
{
// Find the minimum area enclosing circle
Point2f center, vtx[4];
float radius = 0;
minEnclosingCircle(Mat(points), center, radius);
circle(image, center, cvRound(radius), Scalar(0, 255, 255), 1, LINE_AA);
points.clear();
}
imshow(window_name, image);
}
// Action when left button is clicked
if (event == EVENT_LBUTTONDOWN)
{
if (!start_draw)
{
roi_x0 = x;
roi_y0 = y;
start_draw = true;
}
else {
roi_x1 = x;
roi_y1 = y;
start_draw = false;
}
}
// Action when mouse is moving
if ((event == EVENT_MOUSEMOVE) && start_draw)
{
// Redraw bounding box and rectangle
Mat current_view;
image.copyTo(current_view);
rectangle(current_view, Point(roi_x0, roi_y0), Point(x, y), Scalar(0, 0, 255));
int radius = max(abs(roi_x0 - x), abs(roi_y0 - y));
circle(current_view, Point(roi_x0, roi_y0), radius, Scalar(255, 0, 0), 1, 8);
imshow(window_name, current_view);
}
}
int main(int argc, const char** argv)
{
// Init window interface and couple mouse actions
namedWindow(window_name, WINDOW_AUTOSIZE);
setMouseCallback(window_name, on_mouse);
imshow(window_name, image);
int key_pressed = 0;
do
{
// Keys for processing
// You need to select one for confirming a selection and one to continue to the next image
// Based on the universal ASCII code of the keystroke: http://www.asciitable.com/
// c = 99 add rectangle to current image
// <ESC> = 27 exit program
key_pressed = 0xFF & waitKey(0);
if (key_pressed==99)
{
// Add draw a rectangle to and a circle on the list
num_of_rec++;
image
int radius = max(abs(roi_x0 - roi_x1), abs(roi_y0 - roi_y1));
circle(image, Point(roi_x0, roi_y0), radius, Scalar(0, 0, 255), 1, 8);
rectangle(image, Point(roi_x0, roi_y0), Point(roi_x1, roi_y1), Scalar(0, 255, Scalar(255, 0, 0), 1);
imshow(window_name, image);
}
}
// Continue as long as the <ESC> key has not been pressed
while (key_pressed != 27);
// Close down the window
destroyWindow(window_name);
return 0;
}