What library to take for coin image recognition?

Question

Pattern recognition

We need to write an application that will recognize a coin in a photo and search for it in the local coin database.
When recognizing, there may be areas with slightly changed data - for example, the year of issue of a coin.
Please advise a platform so as not to reinvent your wheel.

Answer 1

Is it difficult to write an image recognition web application?
there are links to ready-made recognition services and to Wikipedia with a description of the algorithms and links to their implementation.