Content-based image retrieval system and method for retrieving image using the same

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.

1 - 33 . (Cancel)  
     
     
         34 . Data stream for use in retrieving an image, the data stream transmitted from a web browser to a web server, comprising: 
 a retrieval request signal; and    an image descriptor extracted from an image based on an angular component and a radial component of the image,    wherein the image descriptor includes j (j is a natural number) ART coefficients each of which is expressed as:                      F     n                 m       =            <       V     n                 m            (     ρ   ,   θ     )           ,       f        (     ρ   ,   θ     )       >                   =              ∫   0     2      π              ∫   0   1            V     n                 m     *          (     ρ   ,   θ     )             ,       f        (     ρ   ,   θ     )          ρ                      ρ                        θ                               where, F nm  is an ART coefficient of order n and m, n and m are integer numbers, V nm (ρ,θ) is an ART basis function, ƒ(ρ,θ) is an image in polar coordinates, and * denotes a conjugate complex number.    
     
     
         35 . (Cancelled)  
     
     
         36 . The data stream as recited in  claim 34 , wherein the ART coefficient includes an ART basis function expressed as:  
         V   nm (ρ,θ)= A   m (θ) R   n (ρ)  
       where, A m (θ) is an angular function and R n (ρ) is a radial function.  
     
     
         37 . The data stream as recited in  claim 36 , wherein the angular function A m (θ)includes an exponential function having rotation invariance, which is expressed as:  
       
         
           
             
               
                 
                   A 
                   m 
                 
                  
                 
                   ( 
                   θ 
                   ) 
                 
               
               = 
               
                 
                   1 
                   
                     2 
                      
                     π 
                   
                 
                  
                 
                   exp 
                    
                   
                     ( 
                     
                       j 
                        
                       
                           
                       
                        
                       m 
                        
                       
                           
                       
                        
                       θ 
                     
                     ) 
                   
                 
               
             
           
           
           
               
           
         
       
       where, θ is an angle from an x-axis.  
     
     
         38 . The data stream as recited in  claim 34 , wherein the radial function R n (ρ) is an even cosine function, which is expressed as:  
       
         
           
             
               
                 
                   R 
                   n 
                 
                  
                 
                   ( 
                   ρ 
                   ) 
                 
               
               = 
               
                 { 
                 
                   
                     
                       1 
                     
                     
                       
                         n 
                         = 
                         0 
                       
                     
                   
                   
                     
                       
                         2 
                          
                         
                             
                         
                          
                         
                           cos 
                            
                           
                             ( 
                             
                               π 
                                
                               
                                   
                               
                                
                               n 
                                
                               
                                   
                               
                                
                               ρ 
                             
                             ) 
                           
                         
                       
                     
                     
                       
                         n 
                         ≠ 
                         0 
                       
                     
                   
                 
               
             
           
           
           
               
           
         
       
       where, ρ is a distance from an origin.  
     
     
         38 . A content-based retrieval system for retrieving an image in a content-based image retrieval system including a web browser, a web server and a database storing images and image descriptors each of which represents characteristics of the image, the system comprising: 
 means for receiving a query image;    means for extracting a query image descriptor from the query image based on at least an angular component and a radial component of the query image;    means for requesting to retrieve an image based on the query image descriptor to the web server; and    means for receiving and displaying at least an image similar to the query image from the database.    
     
     
         39 - 74 . (Cancelled)