【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”