I'm a C programmer. I prefer C over C++ most of the time but I have seen benchmarks of OpenCV performing well when C++ is used. Why should I choose C++ and why is it faster than C? When I say C++ is faster than C, the scope is confined to OpenCV. Do the C portions of OpenCV become deprecated??
C API was present in OpenCV 1.x. Now it is supported for backward compatibility only. It is deprecated and may be removed in the future.
how soon can we expect for C interface to disappear. coz I love C for its simplicity, which C++ ultimately lacks
c is simplistic but not simplicity, it lacks too many abstraction power to create clean codes like c++.The opencv api of c++ are much more cleaner and easier to use
the only issue is that C is still much more compatible with other high-level languages, many support only interfacing with C and not C++. it would be nice to have an automatically generated C API, the same way that the Python, Java and MATLAB bindings are generated.
There is a similar question - including python - on stackoverflow with similar conclusion to Alexander's.
May be the benchmark what you mention is Shervin Emami's. To summarize he has created a speed comparison of C and C++ interface using different OpenCV versions. His conclusion is that the new C interface is slower than both the old C and the new C++. Moreover the new C++ interface is almost as fast as the old C interface. The slowness of the new C interface can be a consequence of the deprication, in other words the aim of the development is backward compatibility only and not performance.
So far I have used the C interface but as I see from the examples, the C++ part is more user friendly and cleaner.
Anyway the second edition of the really useful book, Learning OpenCV has just come out. As the subtitle (Computer Vision in C++ with the OpenCV Library) suggests it deals with C++ mainly.
The C interface of OpenCV is nowadays a wrapper around the C++ core and calls these functions internally. However, there are some old functions that still use C code only but this is not standard.
Thus, in many cases there is little difference in calling the C vs. the C++ version of a certain function.
what does it has to do with C++ performance? is the C++ codes are getting optimized, and C portions are left to die?
Asked: 2012-12-22 04:00:52 -0600
Seen: 6,568 times
Last updated: Jan 01 '13
