63fb46d6_bster_US___Patent_applications__Description
[Patent application number] 20120177286 [Published] 07-12-2012 [Description] 
DETERMINING AN ORIENTATION DIRECTION OF A COLOR EDGE AT A PIXEL LOCATION IN A COLOR IMAGE - What is disclosed is a system and method for determining an orientation direction of a color edge at a given pixel location in a binary color image. The orientation direction of the color edge is determined from eight pixel counts with each pixel count being a total number of pixels in each of eight regions of a window centered about a candidate pixel which resides along the color edge. The eight regions are associated with 8 compass points. The orientation of the edge is determined by a 1
Xing Li, Webster US - Patent applications