【学习OpenCV】——highgui

官方文档说明：点击打开链接

C++的接口，基于opencv 2.4.9

进度条

创建进度条：  

int  createTrackbar ( const string&  trackbarname , const string&  winname , int*  value , int  count , TrackbarCallback  onChange =0, void*  userdata =0 )

namedWindow("source", CV_WINDOW_NORMAL); //创建窗口
int sliderval = 10; //进度条的初始位置为10
createTrackbar("wrap","source",&sliderval,100); //最大位置100

获得进度值：

int  getTrackbarPos ( const string&  trackbarname , const string&  winname )

设置进度值：

void setTrackbarPos( const string&  trackbarname , const string&  winname , int  pos)

示例：点击打开链接

图像显示

void imshow( const string&  winname , InputArray  mat)

函数支持3种输入数据，所以要适当处理

• If the image is 8-bit unsigned, it is displayed as is.
• If the image is 16-bit unsigned or 32-bit integer, the pixels are divided by 256. That is, the value range [0,255*256] is mapped to [0,255].
• If the image is 32-bit floating-point, the pixel values are multiplied by 255. That is, the value range [0,1] is mapped to [0,255].

If window was created with OpenGL support, imshow also support ogl::Buffer , ogl::Texture2D and gpu::GpuMat as input.

窗口

创建窗口：

void  namedWindow ( const string&  winname , int  flags =WINDOW_AUTOSIZE  )

Parameters:

name – Name of the window in the window caption that may be used as a window identifier. flags – Flags of the window. The supported flags are: WINDOW_NORMAL If this is set, the user can resize the window (no constraint). WINDOW_AUTOSIZE If this is set, the window size is automatically adjusted to fit the displayed image (see imshow() ), and you cannot change the window size manually. WINDOW_OPENGL If this is set, the window will be created with OpenGL support.

销毁窗口：

void  destroyWindow ( const string&  winname )

销毁所有窗口：

void  destroyAllWindows ( )

调整窗口大小：

void  resizeWindow ( const string&  winname , int  width , int  height )

刷新窗口：

void  updateWindow ( const string&  winname )

动作

鼠标

void  setMouseCallback ( const string&  winname , MouseCallback  onMouse , void*  userdata =0  )

空格键：

int  waitKey ( int  delay =0 )

Parameters:	delay – Delay in milliseconds. 0 is the special value that means “forever”