Patent ID: 6404900
Filing Date: 2002-06-11
Classification: G06K,G06T

Abstract:
A method for robust human face tracking in the presence of multiple facial images comprising:taking a frame from a color video sequence as a current input image; filtering the current input image in chromaticity space; estimating the locations of faces in the image based on a projection histogram of the filtered image, including: determining a sample mean &mgr; and standard deviation &sgr; using all of the samples in a distribution; setting &mgr;t(0)=&mgr; and &dgr;=max (a*&sgr;, b*image-width) where a and b are scaling factors, resulting in an initial trimmed mean &mgr;(k) within an initial trimmed interval (k); determining a trimmed mean &mgr;t (k+1) which is used to define the interval [&mgr;t(k)âˆ’&dgr;, &mgr;t(k)+&dgr;]; redetermining the trimmed mean until |&mgr;t (k+1)âˆ’&mgr;t(k)|extracting and outputting the tracked face regions.