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Can we do the stuffs like detecting the motion and performing functions or detecting some finger movements from IR cameras and all stuffs using c++ and C# easily.
or i have seen a Software "VVVV" (vvvv - a multipurpose toolkit | vvvv) this is better??
if any one have idea regarding this, plz tell me..
Can we do it with C++? Yes, sure. Will it be easy? Probably not.
First off, it's low level. You will be working with hardware and hardware is tricky. Secondly, things such as motion is incredibly complex and tricky to get right. Most products don't get it right all the time either. Not even Windows.
Can you do it in C#? No. The language lacks the required low-level features. That is, unless, you use a toolkit or library or some other building block which is my next point...
Can you do it with VVVV or some other software/library? Yes, sure. Know that these libraries and software build upon C or C++, but encapsulates it into some higher level abstraction interface. This is a good thing.
You should definitely use something like this if you can find some good such library/software. Some might expose interfaces that allows you to use languages other than C/C++.
Given your other threads, I'd say you're jumping into the deep end of the pool without knowing how to swim here. Start smaller, learn the language *well*, and then maybe you can work on something like this.