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

2019-11-06 08:44:16

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Imread（）Imwrite（）Imshow（）nameWindow（）createTrackbar（）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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