Libraries / Image Analysis Functions

I have an idea to create an application that will allow me to analyze the image from the camera phone on Android. I am thinking of creating an application that recognizes faces (for now this is just an idea), but first I want to create something simpler (for example, an application that detects, for example, a red square next to the blue circle). Does the android have any libraries or functions that will help me recognize shapes (for example, square, rectangle, circle) and colors in the picture that I made using my camera phone? Any suggestion is welcome.