有趣的wimage相关类

在ROS下编程的时候，发现一个例子是调用opencv2/core/wimage.hpp类的，去年的时候，我倒仔细查看这个头文件，没有深研究，百度，谷歌了一番，都没有找到任何资料。现在趁这个机会，好好研究下他。

其实，我本人是很喜欢C++,也远胜于爱C的。这个类库是Google开发的，另外，同事共享了一个Google开发C++的编程规范（http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml），我在这里也贴出来，好的编程习惯，对己对他人都有莫大的好处的。

 

这个头文件的分析，我是写到这里（http://blog.sina.com.cn/s/blog_661159d50100r1g7.html）

里面定义了三个模板类：WImage,WImageBuffer,WImageView (一个是虚基类，另外两个，一个是作为buffer配置和组织，一个是便于组织外数据和子图的基类)；另外还有三个WImage, WImageBufferC, WImageViewC.

这里写几个简单的测试例子，便于理解（测试环境opencv2.2+vs2008），这个类特别适合对于图像操作与理解，可以把图像想象为数组，所以操作起来就跟matlab一样。

 

Example 1, Show image and Show ROI

#include <opencv2/highgui/highgui.hpp> #include <opencv2/core/wimage.hpp> #include <iostream> using namespace std; int main(int argc, char** argv) { //load image cv::WImageBuffer3_b im1(cvLoadImage("D://lena.jpg",1)); //create 512*512 3 channels arrar, this size should be matched by im1 cv::WImageBuffer3_b im(512,512); //test IsNull() function; if(im.IsNull()) { cout<<"this arrar has no data!"<<endl; exit(0); } //test CopyFrom() function; im.CopyFrom(im1); ////test CloneFrom() function //im.CloneFrom(im1); //show the image cvNamedWindow("Test",1); cvShowImage("Test",im.Ipl()); //define sub_image or ROI cv::WImageView3_b sub_im(&im,0,0,100,100); cvNamedWindow("ROI",1); cvShowImage("ROI",sub_im.Ipl()); // show the details about image cout<<"Channel Size: "<<im.ChannelSize()<<endl <<"Channels: "<<im.Channels()<<endl <<"Pixel size: "<<im.PixelSize()<<endl; cvWaitKey(0); return 1; }

And the results of this code:

Abviously, it is help for sub_image-or-ROI's operating.

 

Example 2: operate on external data

#include <opencv2/highgui/highgui.hpp> #include <opencv2/core/wimage.hpp> #include <iostream> using namespace std; void MySetRand(cv::WImage_b* im) { for(int r=0;r<im->Height();++r) { //float* row=im->Row(r); uchar* row=im->Row(r); for(int c=0;c<im->Width();++c) { for(int ch=0;ch<im->Channels();++ch,++row) { *row=uchar(rand()&255); //show the data //cout<<endl<<(int)*row; } } } } int main(int argc, char** argv) { cv::WImageBuffer3_b im1(cvLoadImage("D://lena.jpg",1)); cv::WImageBuffer3_b im(512,512); //test CopyFrom() function; im.CopyFrom(im1); if(im.IsNull()) { cout<<"this arrar has no data!"<<endl; exit(0); } //create external data of 320*240*3 cv::WImageBuffer3_b im3(320,240); cv::WImageView3_b sub_im(&im3,0,0,100,100); im3.SetZero(); ////set data at row=2,column=3 //*im3(2,3)=15; //set random data for image_data MySetRand(&sub_im); cvNamedWindow("ROI",1); cvShowImage("ROI",sub_im.Ipl()); //copy the first row into the zone (w,h) int w=im3.Width(); int h=im3.Height(); for(int i=0;i<h;i++) { im1.View(0,i,w,1).CopyFrom(im1.View(0,0,w,1)); } cvNamedWindow("ROI2",1); cvShowImage("ROI2",im1.Ipl()); cvWaitKey(0); return 1; }   

And this result is :

Also this is useful for external data, and this is also useful for operating on image