Face recognition system using Matlab

design a Face recognition system using Matlab. by using a database, the system should detect and recognize the face from the database.The code should detect the features like eyes, nose, mouth, and face. don't use Matlab shortcuts such as Vision cascade. I want the code from scratch by binarizing the image and resizing it, using some detection techniques like correlation or eigenvalue or vectors, and KNN. Write comments to explain every step.