i want to detect face in a different method , i am new to matlab , i don't know how to approach, help me

1. Draw initial face rectangle,suppose the image only contains a front-view face, the face with full width of the image, eyes begin at 1 3 of the whole height and chin occupies 1 9 of whole height. 2. Shrink face rectangle, check line density DLof the left and right lines of face 3. Eye regions detection (a) Locate the small area between eyes (b) From the area, search the left part and right parts, find the true width of the face (c) Initial the positions of eyes, locate the left and right blocks with enough valid points (d) Adjust the sizes of left and right blocks to make sure they are the same size 4. Locate low part consists of nose and mouth (a) Initial the low part below eyes. the width is from center of the left eye to center of the right eye, height is from the low edge of left eye to the low edge of face; (b) Erase the blank lines around four edges of low part, and include the valid parts below or above current low parts. (c) Balance the low part according to central point between left and right eye. 5. Cut the minimal rectangle which contains left eye block, right eye block and low part block.