C + + OpenCV high-speed sample learning--reading graph display

1. Key functions

1. Read in picture imread (picture or position, display format):imread_color

Display format:

 imread_unchanged =-1    // 8bit, color or  not   

 imread_grayscale    = 0    // 8bit ,  gray   

 imread_color           = 1    //   color   

 imread_anydepth      = 2   //  any depth,   

Imread_anycolor = 4//Any color

2. Display Picture imshow (picture name, mat type picture)

There are a lot of examples with Namedwindow in it, but I find that there is no problem. Maybe I haven't found it yet!

A correction was found.

3.waitKey () function

Suppose you use Cvwaitkey (0) to display only the first frame of video.Return value: Assuming delay>0, then return-1 over the specified time, assuming delay=0. There will be no return value.

Suppose the program wants to respond to a key. The IF (Cvwaitkey (1) ==keyvalue) is available, and if (Cvwaitkey () >= 0) is often present in the program, it is said that the random key in 10ms enters the IF block.

2. Code--Display the picture you entered and name it yourself!

Note: The use of opencv2.4.4, debugging through!

C + + OpenCV high-speed sample learning--reading graph display