OpenCV2: summary article highgui module

A mouse operation

1.cv::OnMouse()

void onMouse(int event,int x,int y,int flags,void* param);

void  onMouse(int event,int x,int y,int flags,void* param){
 
    cv::Mat* image=reinterpret_cast<cv::Mat*>(param);
 
    switch (event) {// scheduled events
        
        case CV_EVENT_LBUTTONDOWN: // left mouse button down event
 
        // display pixel values ​​(x, y)
        std::cout<<static_cast<int>(image->at<unchar>(cv::Point(x,y)))<<std::endl;
        break;
    }
}
 
// Register the callback messages
cv::setMouseCallback("Image",onMouse,reinterpret_cast<void*>(&image));

 

2.cvMouseCallback()

 

II. Keyboard

1.cv::waitKey()

 

2.cvWaitKey()

 

III. Drawing Operation

1.cv::circle

 

2.cv::Scalar

 

3.cv::putText

 

4.cv::rectangle

rectangle (image, cv :: Rect (0,0,100,200), cv :: Scalar (0,255,0), 2); // green box

 

IV. Read image

1.cv::imread()

Mat imread :: CV (const String & filename, the flags = int. 1)

(. 1) The first parameter is the image path, in the Windows operating system, the OpenCV imread function supports the following types of image loading:

Windows Bitmap - *. BMP, * .dib
JPEG files - * .jpeg, * .jpg, * .jpe
JPEG 2000 file - * .jp2
PNG picture - * .png
portable document format - * .pbm, .PGM *, * .ppm
Sun raster of Rasters file - .sr *, * .ras
TIFF files - * .tiff, * .tif

(2) The second parameter is the processing macro

IMREAD_UNCHANGED = -1, // read picture
IMREAD_GRAYSCALE = 0, // grayscale image
IMREAD_COLOR = 1, // the color image
IMREAD_ANYDEPTH = 2, // original image depth
IMREAD_ANYCOLOR = 4, // original color

 

2.cvLoadImage()

IplImage * cvLoadImage (const char * filename , int flags = CV_LOAD_IMAGE_COLOR);

first parameter:

"G: \\ \\ 1.jpg Image" to two backslashes

second argument:

CV_LOAD_IMAGE_COLOR By default, the image 8 is, in the form of three channels are read (the default image also makes cast channel 3)

CV_LOAD_IMAGE_GRAYSCALE cast single channel

CV_LOAD_IMAGE_ANGCOLOR holding places original image data is read into the passage way

CV_LOAD_IMAGE_ANYDEPTH image is a 16-bit image

CV_LOAD_IMAGEUNCHANGED that number of channels and the number of bits the read image and the original image consistent

-1 original image is read into the default channels

0 cast grayscale

1 reads color image

 

 

V. create a window / destroy the window

1.cv::namedWindow () / cv :: destoryWindow ()

 

2.cvNameWindow() / cvDestoryWindow()

 

VI. The image display

1.cv::imshow()

 

2.cvShowImage()

 

VII. Save the image

1.cvSaveImage()