demid5111

Install OpenCV 4.5 on Ubuntu 18.04

Pre-configured OpenCV for Python from PyPi

1. open the terminal
2. check Python3 installation: python3 --version
3. go to official website to learn details: https://pypi.org/project/opencv-python/
4. choose the most complete package and run: python3 -m pip install opencv-contrib-python often you will not find the pip installed by default, therefore use the corresponding steps from the

demid5111

Install OpenCV 4.5 on Windows 10

Pre-configured OpenCV for Python from PyPi

1. open the terminal (Ctrl+R + cmd)
2. check Python3 installation: py --version
3. go to official website to learn details: https://pypi.org/project/opencv-python/
4. choose the most complete package and run: py -m pip install opencv-contrib-python
5. check installation by entering the Python REPL: py
6. import tha library: import cv2

demid5111

Install OpenCV 4.5 on macOS

Pre-configured OpenCV for Python from PyPi

1. open the terminal
2. check Python3 installation: python3 --version
3. go to official website to learn details: https://pypi.org/project/opencv-python/
4. choose the most complete package and run: pip install opencv-contrib-python
5. check installation by entering the Python REPL: python3
6. import tha library: import cv2

demid5111

#include <iostream>
#include <vector>

int main () {
    std::vector<int> counters = {10, 20, 30};

    // need mutable as lambda by default is a const expression
    auto passByValueLambda = [=] () mutable {
        std::cout << "Hello, lambda by value" << std::endl;
        // modifying the copy - original vector is not influenced

demid5111

#include <iostream>

int main () {
    int counter = 10;
    auto basicLambdaFunc0 = [] () { std::cout << "Hello, lambda" << counter << std::endl;};

    basicLambdaFunc0();
}

demid5111

#include <iostream>

int main () {
    // the most used form of lambdas without return type
    auto basicLambdaFunc0 = [] () { std::cout << "Hello, lambda0" << std::endl;};
    
    // omitting parameters
    auto basicLambdaFunc1 = [] { std::cout << "Hello, lambda1" << std::endl;};
    
    // the most detailed syntax