OpenCv (正式篇) 5----Highgui板块 /* 不断更新 */

1. Imread（）
2. Imwrite（）
3. Imshow（）
4. nameWindow（）
5. createTrackbar（）
6. setMouseCallback（）

Imread（）：

转到定义查看：

CV_EXPORTS_W Mat imread( const String& filename, int flags = IMREAD_COLOR );//////! Imread flagsenum ImreadModes {       IMREAD_UNCHANGED  = -1, //!< If set, return the loaded image as is (with alpha channel, otherwise it gets cropped).       IMREAD_GRAYSCALE  = 0,  //!< If set, always convert image to the single channel grayscale image.       IMREAD_COLOR      = 1,  //!< If set, always convert image to the 3 channel BGR color image.       IMREAD_ANYDEPTH   = 2,  //!< If set, return 16-bit/32-bit image when the input has the corresponding depth, otherwise convert it to 8-bit.       IMREAD_ANYCOLOR   = 4,  //!< If set, the image is read in any possible color format.       IMREAD_LOAD_GDAL  = 8   //!< If set, use the gdal driver for loading the image.     };

imread( const String& filename, int flags = IMREAD_COLOR );
第一个参数：String filename。
第二个参数：flag

   IMREAD_UNCHANGED  = -1, //!< If set, return the loaded image as is (with alpha channel, otherwise it gets cropped).（原始图片）   IMREAD_GRAYSCALE  = 0,  //!< If set, always convert image to the single channel grayscale image.（灰度图）   IMREAD_COLOR      = 1,  //!< If set, always convert image to the 3 channel BGR color image.（彩色图）   IMREAD_ANYDEPTH   = 2,  //!< If set, return 16-bit/32-bit image when the input has the corresponding depth, otherwise convert it to 8-bit.   IMREAD_ANYCOLOR   = 4,  //!< If set, the image is read in any possible color format.（IMREAD_ANYDEPTH| IMREAD_ANYCOLOR  最真实图片）   IMREAD_LOAD_GDAL  = 8   //!< If set, use the gdal driver for loading the image.

Imwrite（）：
转到定义查看：

imwrite( const String& filename, InputArray img,              const std::vector<int>& params = std::vector<int>());第一个参数：filename---String第二个参数: Mat第三个参数：不了解 待解决（因为有默认值，所以一般不填写）Imshow（）转到定义查看：

void imshow(const String& winname, InputArray mat);

这个最好明白：第一个参数： String filename第二个参数:       inputArray matnamedWindow（）转到定义：

 void namedWindow(const String& winname, int flags = WINDOW_AUTOSIZE); // Flags for namedWindowenum { WINDOW_NORMAL     = 0x00000000, // the user can resize the window (no constraint) / also use to switch a fullscreen window to a normal size            WINDOW_AUTOSIZE   = 0x00000001, // the user cannot resize the window, the size is constrainted by the image displayed            WINDOW_OPENGL     = 0x00001000, // window with opengl support   WINDOW_FULLSCREEN = 1,          // change the window to fullscreen   WINDOW_FREERATIO  = 0x00000100, // the image expends as much as it can (no ratio constraint)   WINDOW_KEEPRATIO  = 0x00000000  // the ratio of the image is respected };

第一个参数：窗口名称：String name；第二个参数：缺省值已经很好用了。自动调节。 createTrackbar（）setMouseCallback（）转到定义：void setMouseCallback(const String& window_name, MouseCallback onMouse, void* userdata = 0/*缺省值*/);

 #include "opencv2/highgui.hpp"; #include <iostream>; using namespace std; using namespace cv; void onChange(int event, int x, int y, int flags, void* userdata){ cout<<"test"<<endl; };   void main(){namedWindow("test");/*Mat image=imread("D:\\Picture\\Temp.jpg",-1);imshow("test",image);*/setMouseCallback("test",onChange);waitKey(0);}

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各种有趣函数。。。从图像处理开始