OpenCV Coding Standard - Naotoshi Seo

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OpenCV Coding Standard

Intel OpenCV Coding Style
Error Handling and System Functions
CodingStyleGuide - OpenCV Wiki
```
CVAPI(void) cvXxx( const CvArr *arr, 
                             const CvArr *mask CV_DEFAULT(NULL) )
```
CVAPI is for C compiler (extern "C" { and so on). CV_DEFAULT is to disable default value for C compiler (default value setting is available in c++, but not in c).