Method and apparatus for video-encoding/decoding using filter information prediction

Abstract

Provided is a scalable video-decoding method based on multiple layers. The scalable video-decoding method according to the present invention comprises: a step of predicting first filter information of a video to be filtered using the information contained in an object layer and/or information contained in another layer, and generating second filter information in accordance with the prediction; and a step of filtering the video to be filtered using the second filter information. According to the present invention, the amount of information being transmitted is reduced, and video compression performance is improved.

The invention claimed is: 
     
         1 . A scalable video decoding method based on multi layers, comprising:
 generating second filter information by using at least one of information included in an object layer and information included in the other layer; and   performing filtering on a video to be filtered by using the first filter information based on the second filter information, and   receiving difference information of the first filter information and the second filter information from a coder,   wherein the object layer is a layer including the video to be filtered, the other layer that is a layer other than the object layer is used to perform decoding at the object layer, the first filter information is information for filtering of the video to be filtered, and the second filter information is prediction filter information generated for filtering the video to be filtered, and   wherein the performing of the video to be filtered using the first filter information based on the second filter information includes:
 generating the first filter information by summing up the second filter information and the difference information; and 
 performing the filtering on the video to be filtered using the first filter information. 
   
     
     
         2 . The method of  claim 1 , wherein the first filter information is at least one of adaptive loop filter information, interpolation filter information, and deblocking filter information. 
     
     
         3 . The method of  claim 1 ,
 further comprising receiving a filter information prediction indicator from a coder,   wherein the filter information prediction indicator indicates at least one of information on whether prediction for any of the first filter information is performed, information on whether the prediction for the first filter information is performed using information of any layer, information on whether the first filter information is predicted from any filter information, and information on a method using the second filter information.   
     
     
         4 . The method of  claim 3 , wherein at the generating of the second filter information including the prediction values for the first filter information, the prediction for the first filter information is performed using information included in a layer indicated by the filter information prediction indicator among the object layer and the other layer. 
     
     
         5 . A filtering method for decoding scalable videos based on multi layers, comprising:
 processing computer executable program code embodied in computer readable storage media by a decoding processor, the computer executable program code comprising:   program code that generates second filter information by using at least one of information included in an object layer and information included in the other layer; and   program code that performs filtering on a video to be filtered by using the first filter information based on the second filter information, and   program code that receives difference information of the first filter information and the second filter information from a coder,   wherein the object layer is a layer including the video to be filtered, the other layer that is a layer other than the object layer is used to perform decoding at the object layer, the first filter information is information for filtering of the video to be filtered, and the second filter information is prediction filter information generated for filtering the video to be filtered, and   wherein the performing of the video to be filtered using the first filter information based on the second filter information includes:
 generating the first filter information by summing up the second filter information and the difference information; and 
 performing the filtering on the video to be filtered using the first filter information. 
   
     
     
         6 . The filtering method of  claim 5 , wherein the first filter information is at least one of adaptive loop filter information, interpolation filter information, and deblocking filter information. 
     
     
         7 . The filtering method of  claim 5 , further comprising program code that receives a filter information prediction indicator from a coder, wherein the filter information prediction indicator indicates at least one of information on whether prediction for any of the first filter information is performed, information on whether the prediction for the first filter information is performed using information of any layer, information on whether the first filter information is predicted from any filter information, and information on a method using the second filter information. 
     
     
         8 . The filtering method of  claim 7 , wherein at the generating of the second filter information including the prediction values for the first filter information, the prediction for the first filter information is performed using information included in a layer indicated by the filter information prediction indicator among the object layer and the other layer. 
     
     
         9 . A multi-view video decoding method based on videos captured at multi views, comprising:
 generating second filter information by using at least one of information included in an object view and information included in the other view;   performing filtering on a video to be filtered by using the first filter information based on the second filter information, and   receiving difference information of the first filter information and the second filter information from a coder,   wherein the object view is a view including the video to be filtered, the other view that is a view other than the object view is used to perform decoding at the object view, the first filter information is information for filtering of the video to be filtered, and the second filter information is prediction filter information generated for filtering the video to be filtered, and   wherein the performing of the video to be filtered using the first filter information based on the second filter information includes:
 generating the first filter information by summing up the second filter information and the difference information; and 
 performing the filtering on the video to be filtered using the first filter information. 
   
     
     
         10 . The multi-view video decoding method of  claim 9 , wherein the first filter information is at least one of adaptive loop filter information, interpolation filter information, and deblocking filter information. 
     
     
         11 . The multi-view video decoding method of  claim 9 ,
 further comprising receiving a filter information prediction indicator from a coder,   wherein the filter information prediction indicator indicates at least one of information on whether prediction for any of the first filter information is performed, information on whether the prediction for the first filter information is performed using information of any view, information on whether the first filter information is predicted from any filter information, and information on a method using the second filter information.   
     
     
         12 . The multi-view video decoding method of  claim 11 , wherein at the generating of the second filter information including the prediction values for the first filter information, the prediction for the first filter information is performed using information included in a view indicated by the filter information prediction indicator among the object view and the other view. 
     
     
         13 . A filtering method for decoding multi-view videos based on videos captured at multi views, comprising:
 processing computer executable program code embodied in computer readable storage media by a decoding processor, the computer executable program code comprising:
 program code that generates second filter information by using at least one of information included in an object view and information included in the other view; and 
 program code that performs filtering on a video to be filtered by using the first filter information based on the second filter information, 
   program code that receives difference information of the first filter information and the second filter information from a coder,   wherein the object view is a view including the video to be filtered, the other view that is a view other than the object view is used to perform decoding at the object view, the first filter information is information for filtering of the video to be filtered, and the second filter information is prediction filter information generated for filtering the video to be filtered, and   wherein the performing of the video to be filtered using the first filter information based on the second filter information includes:
 generating the first filter information by summing up the second filter information and the difference information; and 
 performing the filtering on the video to be filtered using the first filter information. 
   
     
     
         14 . The method of  claim 13 , wherein the first filter information is at least one of adaptive loop filter information, interpolation filter information, and deblocking filter information. 
     
     
         15 . The filtering method of  claim 13 ,
 further comprising program code that receives a filter information prediction indicator from a coder, wherein the filter information prediction indicator indicates at least one of information on whether prediction for any of the first filter information is performed, information on whether the prediction for the first filter information is performed using information of any view, information on whether the first filter information is predicted from any filter information, and information on a method using the second filter information.   
     
     
         16 . The filter method of  claim 15 , wherein at the generating of the second filter information including the prediction values for the first filter information, the prediction for the first filter information is performed using information included in a view indicated by the filter information prediction indicator among the object view and the other view. 
     
     
       17. An image decoding method performed by an image decoding apparatus, the method comprising:
 generating a prediction block by predicting an object block;   decoding a transform block for the object block;   generating a residual block by inversely transforming the decoded transform block;   reconstructing the object block by adding the residual block and the prediction block; and   filtering a reconstructed image including the reconstructed object block,   wherein the filtering comprises a deblocking filtering and a sample adaptive offset (SAO)filtering;   wherein, in performing the deblocking filtering, a filter type is determined based on a neighboring pixel value of a boundary to be filtered, and the deblocking filtering is performed on the boundary to be filtered according to the determined filter type.   
     
     
       18. An image encoding method performed by an image encoding apparatus, the method comprising:
 generating a prediction block by predicting an object block;   generating a residual block for the object block based on the object block and the prediction block;   generating a transform block by transforming the residual block;   reconstructing the object block based on the transform block and the prediction block; and   filtering a reconstructed image including the reconstructed object block,   wherein the filtering comprises a deblocking filtering and a sample adaptive offset (SAO) filtering;   wherein, in performing the deblocking filtering, a filter type is determined based on a neighboring pixel value of a boundary to be filtered, and the deblocking filtering is performed on the boundary to be filtered according to the determined filter type.   
     
     
       19. A non-transitory computer-readable medium storing a bitstream that is generated by an image encoding method, the method comprising:
 generating a prediction block by predicting an object block;   generating a residual block for the object block based on the object block and the prediction block;   generating a transform block by transforming the residual block;   reconstructing the object block based on the transform block and the prediction block; and   filtering a reconstructed image including the reconstructed object block,   wherein the filtering comprises a deblocking filtering and a sample adaptive offset (SAO) filtering;   wherein, in performing the deblocking filtering, a filter type is determined based on a neighboring pixel value of a boundary to be filtered, and the deblocking filtering is performed on the boundary to be filtered according to the determined filter type.