Logical operation of image pixels

Sample code ：

void demo::bitwise_demo(Mat& image)
{
    Mat m1 = Mat::zeros(Size(255, 255), CV_8UC3);
    Mat m2 = Mat::zeros(Size(255, 255), CV_8UC3);
    rectangle(m1, Rect(100, 100, 80, 80), Scalar(255, 255, 0), -1, 8, 0);
    rectangle(m2, Rect(150, 150, 80, 80), Scalar(0, 255, 255), -1, 8, 0);
    imshow("m1", m1);
    imshow("m2", m2);
    Mat dsc;
    bitwise_or(m1, m2, dsc);
    imshow(" Pixel bit operation ", dsc);
}

rectangle() Function to draw a rectangle on top of an image , The statement in imgproc.hpp

CV_EXPORTS_W void rectangle(InputOutputArray img, Rect rec,
                          const Scalar& color, int thickness = 1,
                          int lineType = LINE_8, int shift = 0);

Parameter one img: The processed image ;

Parameter two rec： It's made up of four numbers , The first two numbers are the coordinates of the pixels in the upper left corner of the rectangle , The last two numbers are the length and width of the rectangle ;

Parameter 3 color： The color of the rectangle ;

Parameter 4 thickness： Line width , Negative numbers indicate padding ;

Parameter 5 line Type： The type of line segment ;

Parameter 6 shift： The number of pixels and decimal places .

line Type There are the following categories ：

enum LineTypes {
    FILLED  = -1,
    LINE_4  = 4, //!< 4-connected line
    LINE_8  = 8, //!< 8-connected line
    LINE_AA = 16 //!< antialiased line
};

Logical operation

bitwise_and     // Logic and 
bitwise_or      // Logic or 
bitwise_xor     // Logical XOR 
bitwise_not     // Logic is not 

bitwise It is the logical operation of pixels , Such as bitwise_and(m1,m2,dsc),m1=Scalar(255,255,0),m2=Scalar(0,255,255), It is the pixel point corresponding to the bit to carry out and operation ,255 And 0 by 0,255 And 255 yes 255,255 And 0 yes 0, So the place where the two rectangles coincide is green .

Effect display ：

 over!!!