OpenCV问题集结版

谁践踏了优雅 2022-09-18 02:55 83阅读 0赞

1：openCV不同版本的变化在哪能找到它的变化的说明文档？

不同版本注意去官网看change log  
http://code.opencv.org/projects/opencv/wiki/ChangeLog

2：OpenCV库的解析

*  从2.2开始，OpenCV里面的库发生了变化。把2.1以前的 cxcore, cv, cvaux, highgui 和 ml 重新划分。

*   *  opencv\_core - core functionality (basic structures, arithmetics and linear algebra, dft, XML and YAML I/O ...).
     *  opencv\_imgproc - image processing (filter, GaussianBlur, erode, dilate, resize, remap, cvtColor, calcHist etc.)
     *  opencv\_highgui - GUI and image & video I/O
     *  opencv\_ml - statistical machine learning models (SVM, Decision Trees, Boosting etc.)
     *  opencv\_features2d - 2D feature detectors and descriptors (SURF, FAST etc., including the new feature detectors-descriptor-matcher framework)
     *  opencv\_video - motion analysis and object tracking (optical flow, motion templates, background subtraction)
     *  opencv\_objdetect - object detection in images (Haar & LBP face detectors, HOG people detector etc.)
     *  opencv\_calib3d - camera calibration, stereo correspondence and elements of 3D data processing
     *  opencv\_flann - the Fast Library for Approximate Nearest Neighbors (FLANN 1.5) and the OpenCV wrappers
     *  opencv\_contrib - contributed code that is not mature enough
     *  opencv\_legacy - obsolete code, preserved for backward compatibility
     *  opencv\_gpu - acceleration of some OpenCV functionality using CUDA (relatively unstable, yet very actively developed part of OpenCV)

3：\#pragma comment

\#pragma comment(lib,"Ws2\_32.lib")表示链接Ws2\_32.lib这个库。 和在工程设置里写上链入Ws2\_32.lib的效果一样，不过这种方法写的 程序别人在使用你的代码的时候就不用再设置工程settings了。

\#pragma comment( comment-type \[, commentstring\] )   
  
Places a comment record into an object file or executable file. The comment-type is one of five predefined identifiers, described below, that specify the type of comment record. The optional commentstring is a string literal that provides additional information for some comment types. Because commentstring is a string literal, it obeys all the rules for string literals with respect to escape characters, embedded quotation marks ("), and concatenation.   
  
compiler   
  
Places the name and version number of the compiler in the object file. This comment record is ignored by the linker. If you supply a commentstring parameter for this record type, the compiler generates a warning.   
  
exestr   
  
Places commentstring in the object file. At link time, this string is placed in the executable file. The string is not loaded into memory when the executable file is loaded; however, it can be found with a program that finds printable strings in files. One use for this comment-record type is to embed a version number or similar information in an executable file.   
  
lib   
  
Places a library-search record in the object file. This comment type must be accompanied by a commentstring parameter containing the name (and possibly the path) of the library that you want the linker to search. Since the library name precedes the default library-search records in the object file, the linker searches for this library just as if you had named it on the command line. You can place multiple library-search records in the same source file; each record appears in the object file in the same order in which it is encountered in the source file.   
  
linker   
  
Places a linker option in the object file. You can use this comment-type to specify a linker option instead placing the option on the Link tab of the Project Settings dialog box. For example, you can specity the /include option to force the inclusion of a symbol:   
  
\#pragma comment(linker, "/include:\_\_mySymbol")   
  
user   
  
Places a general comment in the object file. The commentstring parameter contains the text of the comment. This comment record is ignored by the linker.   
  
The following pragma causes the linker to search for the EMAPI.LIB library while linking. The linker searches first in the current working directory and then in the path specified in the LIB environment variable.   
  
\#pragma comment( lib, "emapi" )   
  
The following pragma causes the compiler to place the name and version number of the compiler in the object file:   
  
\#pragma comment( compiler )   
  
Note For comments that take a commentstring parameter, you can use a macro in any place where you would use a string literal, provided that the macro expands to a string literal. You can also concatenate any combination of string literals and macros that expand to string literals. For example, the following statement is acceptable:   
  
\#pragma comment( user, "Compiled on " \_\_DATE\_\_ " at " \_\_TIME\_\_ )