OpenCV学习笔记—

OpenCV学习笔记——疑问

vec3b：表示每一个Vec3b对象中,可以存储3个char(字符型)数据,比如可以用这样的对象,去存储RGB图像中的一个像素点。typedef Vec<uchar, 3> Vec3b;

卷积

加权平均：各数值乘以相应的权数，然后加总求和得到总体值，再除以总的单位数。

$exttt{dst} (x,y) = sum _{ stackrel{0leq x' < exttt{kernel.cols},}{0leq y' < exttt{kernel.rows}} } exttt{kernel} (x',y')* exttt{src} (x+x'- exttt{anchor.x} ,y+y'- exttt{anchor.y} )$

 1 void Sharpen(const Mat& myImage,Mat& Result)
 2 {
 3     CV_Assert(myImage.depth() == CV_8U);  // 仅接受uchar图像
 4 
 5     Result.create(myImage.size(),myImage.type());
 6     const int nChannels = myImage.channels();
 7 
 8     for(int j = 1 ; j < myImage.rows-1; ++j)
 9     {
10         const uchar* previous = myImage.ptr<uchar>(j - 1);
11         const uchar* current  = myImage.ptr<uchar>(j    );
12         const uchar* next     = myImage.ptr<uchar>(j + 1);
13 
14         uchar* output = Result.ptr<uchar>(j);
15 
16         for(int i= nChannels;i < nChannels*(myImage.cols-1); ++i)
17         {
18             *output++ = saturate_cast<uchar>(5*current[i]
19                          -current[i-nChannels] - current[i+nChannels] - previous[i] - next[i]);
20         }
21     }
22 
23     Result.row(0).setTo(Scalar(0));
24     Result.row(Result.rows-1).setTo(Scalar(0));
25     Result.col(0).setTo(Scalar(0));
26     Result.col(Result.cols-1).setTo(Scalar(0));
27 }

data：

核心函数LUT（The Core Function）

ptr与at的区别