Video coding device and video decoding device

Abstract

A video coding device capable of adaptively processing input video data according to property of the data and realizing effective progressive transmission of the coded data even if image components are different in size and/or different in the number of subbands. The above-mentioned object can be realized by the provision of a transferring-order deciding and ranging portion that can prepare an integrated component unit by forming combinations of subband-based frequency-coefficients of respective components Y, U and V and can change the number of respective elements of respective components Y, U and V.

1 - 12 . (Canceled).  
     
     
         13 . A video coding device comprising: 
 a subband-decomposing means for decomposing into subbands each of a plurality of components composing an image;    a coefficient coding means for encoding frequency coefficients in the subbands to generate coded coefficient data for each subband; and    a variable-length coding means for performing variable-length coding of the coded coefficient data,    wherein the number of subbands of at least one component is different from the number of subbands of other components.    
     
     
         14 . A video coding device comprising: 
 a subband-decomposing means for decomposing into subbands each of a plurality of components composing an image;    a coefficient coding means for encoding frequency coefficients in the subbands to generate coded coefficient data for each subband; and    a variable-length coding means for performing variable-length coding of the coded coefficient data,    wherein an image size and the number of subbands of at least one component are different from an image size and the number of subbands of other components.    
     
     
         15 . A video coding device as defined in any of claims  13  and  14 , 
 wherein the sets of coded coefficient data of the subbands for each of the components are transferred in an ascending order of frequencies starting from a low frequency subband.    
     
     
         16 . A video decoding device comprising: 
 a variable-length decoding means for performing variable-length decoding of coded data of an image composed of a plurality of components to obtain coded coefficient data;    a coefficient decoding means for decoding the coded coefficient data to obtain frequency coefficients; and    a subband synthesizing means for reconstructing a decoded image by synthesizing subbands of the frequency coefficients for respective components,    wherein the number of subbands of at least one component is different from the number of subbands of other components.    
     
     
         17 . A video decoding device comprising: 
 a variable-length decoding means for performing variable-length decoding of coded data of an image composed of a plurality of components to obtain coded coefficient data;    a coefficient decoding means for decoding the coded coefficient data to obtain frequency coefficients; and    a subband synthesizing means for reconstructing a decoded image by synthesizing subbands of the frequency coefficients for respective components,    wherein an image size and the number of subbands of at least one component are different from an image size and the number of subbands for other components.    
     
     
         18 . A video decoding device as defined in any of claims  16  and  17 , 
 wherein the sets of coded coefficient data of the subbands for each of the components are received in an ascending order of frequencies starting from a low frequency subband.    
     
     
         19 . An image decoding device comprising: 
 a variable-length decoder for decoding variable-length coded data of a hierarchically coded image, said hierarchically coded image including more than one kind of luminance or chrominance components;    a decoding truncator for giving a decoding-stop command at any position designated by a user;    a coefficient decoder for decoding the variable-length coded data; and    a subband synthesizer for reconstructing a decoded image by synthesizing subbands containing data decoded by the coefficient decoder for said components,    wherein an image decoded with truncated data is displayable by using data decoded before terminating decoding of said image.    
     
     
         20 . An image decoding device comprising: 
 a variable-length decoder for decoding variable-length coded data of a hierarchically coded image, said hierarchically coded image including more than one kind of luminance or chrominance components;    a decoding truncator for giving a decoding-stop command at any position designated by a user;    a coefficient decoder for decoding the variable-length coded data; and    a subband synthesizer for reconstructing a decoded image by synthesizing subbands containing data decoded by the coefficient decoder for said components,    wherein an image decoded with truncated data is displayable by using data decoded before terminating decoding of said image when at least one kind of said components is different in size and in number of subbands from other kinds of said components.