I want to create a project that implements image recognition using the camera in arduino but I could not find the proper reference and how to match the image captured by the camera with a database that is already available??
I've never tried any camera stuff with Arduino: there are a gazillion threads telling us there's nowhere near enough processing power in an Arduino and it's a waste of time trying.
That might explain the lack of answers in your searching.
"the camera in arduino" - what camera? which arduino?
There is a device called an ArduCam which allows you to retrieve the image in sections. This may serve your purpose but don't expect a lot of speed. Because of RAM needs, you may also be forced to use one of the 'arm' processors such as Due, Zero, or Teensy.
Matching an image to a database is an entirely different endeavor. Get an image first then move on to the next step.