Which language is best for face detection

Answer 1

For image recognition, you will be relying mostly on frameworks and libraries instead of specific languages. OpenCV, for example, works with C++, Java, Python.

https://opencv.org

Microsoft Face API with C++, C#, Java, Python, JS, etc

https://azure.microsoft.com/en-us/services/cognitive-services/face/

If you want to rewrite the entire thing from scratch, the algorithms are also language independent. You can use any language yous re comfortable with. If speed and efficiency is of your concern, go for C/C++.

Answer 2

Java I believe.

Answer 3

Java for android app. C for embedded systems. Web languages problably no.