★幾何變換不改變像素值,而是改變像素所在的位置。 1.映像的平移映像的平移非常簡單,所用到的是中學學過的直角座標系的平移變換公式: x ‘ = x +dx y’ = y + dy 註:(x,y)為源映像的座標,(x’,y’)為新映像的座標,dx對應x的位移量,dy對應y的位移量 2.映像的鏡像 鏡像分為水平鏡像和垂直鏡像 2.1>水平鏡像計算公式如下(映像大小為M*N): x’ = x y’ = N-1-y
One of the common issues that always comes up with programming languages is how to mix code written in one language with code written in another. For example, suppose that you're writing C++ code and wish to call C functions. A common case of this
BOOL CLCDemoDlg::OnInitDialog(){ CDialog::OnInitDialog(); // Add "About..." menu item to system menu. // IDM_ABOUTBOX must be in the system command range. ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ASSERT(IDM_ABOUTBOX < 0xF000); CMenu*
面試時候碰到。還有就是如何防止標頭檔重複定義,用#ifndef#def#enddef野指標,free後再置為NULL。sizeof(enum_type)C++標準p692:In C++,the type of an enumerator is its enumeration. In C,tye type of an enumerator is int. enum e{A}; sizeof(A)==sizeof(int) //in C sizeof(A)==sizeof(e)
標頭檔:MatricesMatrices are implemented as class templates in MRPT, but the followingtwo types are provided for making programs more readable:typedef CMatrixTemplateNumeric<f loat> CMatrixFloat ;typedef CMatrixTemplateNumeric<double>