Hi everyone,
i try to get pixel values from my image and write them into a matrix for further calculus.
For testing i want to display my matrix into another image to make sure i got the right values.
I captured my pixels from the renderwindow into an image. After that i loop through the image to get every pixel value.
Then i wanted to show my matrix into an opencv Mat. All works but my opencv image displays confusing things like an small extract
from the original image. For success it should display the same image like my original.
#include <iostream>
#include <SFML/Graphics.hpp>
#include "opencv2/opencv.hpp"
int main()
{
sf::RenderWindow window(sf::VideoMode(200, 200), "SFML works!");
sf::CircleShape ball(3.f);
ball.setFillColor(sf::Color::White);
sf::Vector2f paddleSize(10.f,30.f);
float ballRadius = 3.f;
sf::RectangleShape paddle_left(paddleSize);
sf::RectangleShape paddle_right(paddleSize);
ball.setRadius(ballRadius);
paddle_left.setFillColor(sf::Color::Green);
paddle_right.setFillColor(sf::Color::Blue);
ball.setFillColor(sf::Color::White);
paddle_left.setOrigin(paddleSize / 2.f);
paddle_right.setOrigin(paddleSize / 2.f);
ball.setOrigin(ballRadius, ballRadius);
paddle_left.setPosition(sf::Vector2f(195,125));
paddle_right.setPosition(sf::Vector2f(5,125));
ball.setPosition(sf::Vector2f(100, 125));
while (window.isOpen())
{
sf::Event event;
while (window.pollEvent(event))
{
if(sf::Keyboard::isKeyPressed(sf::Keyboard::Escape))
{
std::cout << "Game will be terminated!\n";
window.close();
}
if (event.type == sf::Event::Closed)
window.close();
}
window.clear();
window.draw(ball);
window.draw(paddle_left);
window.draw(paddle_right);
window.display();
// capture image from Window
sf::Image image = window.capture();
// get pixel array
sf::Color color;
sf::Vector2u img_size = image.getSize();
unsigned int arr[img_size.y][img_size.x];
for(uint y=0;y<img_size.y;y++)
{
for(uint x=0;x<img_size.x;x++)
{
color = image.getPixel(x,y);
if (color == sf::Color::Blue)
{
arr[x][y] = 0;
}
else if(color == sf::Color::Green)
{
arr[x][y] = 0;
}
else if(color == sf::Color::White)
{
arr[x][y] = 0;
}
else
{
arr[x][y] = 255;
}
}
}
cv::Mat B_OpenCV(img_size.x, img_size.y,CV_8UC(1), &arr);
cv::imshow("edges", B_OpenCV);
if(cv::waitKey(30) >= 0);
}
return 0;
}
Do anyone know why i get a wrong image?!
