Abstract: The present invention relates to method for processing color image on image processing system. The method for processing color image on image processing system includes the steps of: extracting from the color image hue, luminance and saturation which are the factors of the color image; setting the saturation factor as predetermined constant by normalizing the saturation factor; transforming the color image into complex number using the hue factor and luminance factor. Accordingly, an image processing system can reduce the load of color image processing by way of present invention that reduces the redundancy between the factors of color images through transforming the three factors of the color image into complex number.

Abstract: A content-based image retrieval system retrieves an image based on an angular radial transform (ART) image descriptor. In the content-based image retrieval system, a method for retrieving an image includes the steps of: a) receiving a query image; b) extracting a query image descriptor from the query image based on at least an angular component and a radial component of the query image; c) comparing the query image descriptor with an image descriptor stored on the database; and d) determining a degree of a similarity between the query image descriptor and the image descriptor stored on the database.