Face detection on mobile devices

A method for detecting an area with a face (“facial area”) on a color image, comprising:

• (a) placing a search window on the color image;
• (b) determining if a center pixel of the search window is a skin color pixel, wherein the search window is a possible facial area candidate if the center pixel of the search window is a skin color pixel;
• (c) applying a 3-rectangle filter to the search window to determine if the search window is a possible facial area candidate;
• (d) applying a 4-rectangle filter to the search window to determine if the search window is a possible facial area candidate;
• (e) if steps (b), (c), (d) all determine that the search window is a possible facial area candidate, applying an AdaBoost filter to the search window to determine if the search window is a facial area candidate;
• and
• (f) if step (e) determines that the search window is a facial area candidate, saving the location of the search window.