OpenCV的工具函数
OpenCV3也提供了一些經常用于計算機視覺的實用功能，列舉如下:
| cv::alignPtr() | Align pointer to given number of bytes 對齊指針到指定字節數 |
| cv::alignSize() | Align buffer size to given number of bytes 將緩存區大小與給定的字節數對齊 |
| cv::allocate() | Allocate a C-style array of objects 分配一個C風格的數組對象 |
| cvCeil() | Round float number x to nearest integer not smaller than x近似一個浮點數x到不小于x的最近的整數（向上取整） |
| cv::cubeRoot() | Compute the cube root of a number 計算一個數的立方根 |
| cv::CV_Assert() | Throw an exception if a given condition is not true 如果給定條件為假，則拋出異常 |
| CV_Error() | Macro to build a cv::Exception (from a fixed string) and throw it 構造cv::Exception（從固定的字符串）并拋出異常的一個宏 |
| CV_Error_() | Macro to build a cv::Exception (from a formatted string) and throw it 構造cv::Exception（從格式化的字符串）并拋出異常的一個宏 |
| cv::deallocate() | Deallocate a C-style array of objects 釋放一個C風格的數組對象 |
| cv::error() | Indicate an error and throw an exception 指示錯誤并拋出異常 |
| cv::fastAtan2() | Calculate two-dimensional angle of a vector in degrees 向量的二維角度的計算，取值范圍 [ 0.0, 360.0 ) |
| cv::fastFree() | Deallocate a memory buffer 釋放一個內存緩存區 |
| cv::fastMalloc() | Allocate an aligned memory buffer 分配一個對齊的內存緩存區 |
| cvFloor() | Round float number x to nearest integer not larger than x 近似一個浮點數x到不大于x的最近的整數（向下取整） |
| cv::format() | Create an STL string using sprintf-like formatting 以sprintf類似格式創建一個STL字符串 |
| cv::getCPUTickCount() | Get tick count from internal CPU timer 從內部CPU計時器獲得tick計數 |
| cv::getNumThreads() | Count number of threads currently used by OpenCV 獲得當前OpenCV使用的線程數 |
| cv::getOptimalDFTSize() | Compute the best size for an array that you plan to pass to cv::DFT() 計算要傳遞給cv::DFT()的數組的最適宜大小 |
| cv::getThreadNum() | Get index of the current thread 獲得當前線程的索引 |
| cv::getTickCount() | Get tick count from system 獲得系統的tick計數 |
| cv::getTickFrequency() | Get number or ticks per second (see cv::getTickCount()) 獲得每秒的tick計數 |
| cvIsInf() | Check if a floating-point number x is infinity 判斷一個浮點數x是否無窮 |
| cvIsNaN() | Check if a floating-point number x is “Not a Number” 判斷一個浮點數x是否不是一個數 |
| cvRound() | Round float number x to the nearest integer 近似一個浮點數x到最近的整數（四舍五入） |
| cv::setNumThreads() | Set number of threads used by OpenCV 設定OpenCV使用的線程數 |
| cv::setUseOptimized() | Enables or disables the use of optimized code (SSE2, etc.) 開啟或關閉優化代碼 (SSE2, etc.) |
| cv::useOptimized() | Indicates status of optimized code enabling? 指示代碼優化的啟用 |
總結
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