A fast accessing method of color image

Abstract

This paper describes a method of indexing the color distribution of an image, which makes it easier to search for and access of regions by their colors. The index has a quadtree structure with color indexes for successively divided image quadrants in its nodes. Thus the colors in each image quadrant are represented by a color index defined to take account of human visual perception. To perform a search, we descend through the index from a root, checking whether the color index satisfying a condition. The nodes satisfying that condition correspond to image quadrants that contain the color being queried. Experimental result shows that this method is useful for detecting regions according to their colors in the early stages of the search process.