Resolution conversion upon hierarchical coding and decoding

Abstract

In a decoding method of decoding encoded image data which has been hierarchically encoded in advance, a size of an image to be outputted is determined, and then the encoded image data is decoded up to a layer of hierarchy which is at least one layer more than a minimum number of layer/layers of hierarchy necessary to acquire an image of the determined size.

1 .- 85 . (canceled) 
     
     
         86 . A decoding apparatus for decoding encoded image data which has been hierarchically encoded in advance, comprising:
 a decoding unit that decodes the encoded image data; and   a determination unit that determines a number of layer/layers of hierarchy;   wherein the decoding unit decodes the encoded image data up to the determined number of layer/layers of hierarchy,   wherein the determination unit determines the number of layer/layers of hierarchy based on output image information,   the apparatus further comprising,   a reduction unit that reduces a size of the decoded image decoded by the decoding unit based on the output image information.   
     
     
         87 . The decoding apparatus according to  claim 86 ,
 wherein the encoded image is encoded by using JPEG2000.   
     
     
         88 . The decoding apparatus according to  claim 86 ,
 wherein the output image information includes horizontal pixel number information and vertical pixel number information.   
     
     
         89 . A decoding method of decoding encoded image data which has been hierarchically encoded in advance, comprising:
 determining a number of layer/layers of hierarchy based on output image information;   decoding the encoded image data up to the determined number of layer/layers of hierarchy; and   reducing a size of the decoded image based on the output image information.   
     
     
         90 . The decoding method according to  claim 89 ,
 wherein the encoded image is encoded by using JPEG2000.   
     
     
         91 . The decoding method according to  claim 89 ,
 wherein the output image information includes horizontal pixel number information and vertical pixel number information.   
     
     
         92 . A decoding method comprising:
 determining a number of layer/layers of hierarchy of encoded image data based on output image information; and   decoding the encoded image data up to the determined number of layer/layers of hierarchy.   
     
     
         93 . A decoding apparatus for decoding encoded image data which has been hierarchically encoded in advance, comprising:
 a decoding unit that decodes the encoded image data; and   a determination unit that determines a number of layer/layers of hierarchy,   wherein the decoding unit decodes the encoded image data up to the determined number of layer/layers of hierarchy, and   wherein the determination unit determines the number of layer/layers of hierarchy based on output image information.   
     
     
         94 . The decoding apparatus according to  claim 93 ,
 wherein the encoded image is encoded by using JPEG2000.   
     
     
         95 . The decoding apparatus according to  claim 93 ,
 wherein the output image information includes horizontal pixel number information and vertical pixel number information.   
     
     
         96 . A decoding method of decoding encoded image data which has been hierarchically encoded in advance, comprising:
 determining a number of layer/layers of hierarchy based on output image information; and   decoding the encoded image data up to the determined number of layer/layers of hierarchy.   
     
     
         97 . The decoding method according to  claim 96 ,
 wherein the encoded image is encoded by using JPEG2000.   
     
     
         98 . The decoding method according to  claim 96 ,
 wherein the output image information includes horizontal pixel number information and vertical pixel number information.   
     
     
         99 . A decoding apparatus for decoding encoded image data which has been hierarchically encoded in advance, comprising:
 a decoding unit that decodes the encoded image data;   a determination unit that determines a decoding layer of hierarchy;   wherein the decoding unit decodes the encoded image from lowest layer of the encoded image to the determined layer of the encoded image;   wherein the determination unit determines the decoding layer of hierarchy based on output image information.   
     
     
         100 . The decoding apparatus according to  claim 99 ,
 wherein the encoded image is encoded by using JPEG2000.   
     
     
         101 . The decoding apparatus according to  claim 99 ,
 wherein the output image information includes horizontal pixel number information and vertical pixel number information.   
     
     
         102 . A decoding method of decoding encoded image data which has been hierarchically encoded in advance, comprising:
 determining a decoding layer of hierarchy based on output image information; and   decoding the encoded image data from lowest layer of the encoded image data to the determined layer.   
     
     
         103 . The decoding method according to  claim 102 ,
 wherein the encoded image is encoded by using JPEG2000.   
     
     
         104 . The decoding method according to  claim 102 ,
 wherein the output image information includes horizontal pixel number information and vertical pixel number information.