Image decoding device and method

Abstract

The present disclosure relates to an image decoding device capable of recognizing performance necessary for decoding more accurately and a method. Coded data of image data and decoding load definition information for defining a magnitude of a load of a decoding process of a partial region of an image of the image data are acquired; decoding of the acquired coded data is controlled based on the acquired decoding load definition information; and the acquired coded data is decoded according to the controlling. The present disclosure can be applied to an information processing device such as an image coding device that scalably codes image data or an image decoding device that decodes encoded data obtained by scalably coding image data.

1 . An image decoding device comprising:
 a control unit configured to control decoding of coded data, which has been transmitted from an image coding device and received by the image decoding device and in which the image is coded, based on information indicating a size of a partial region of the image and a level indicating a load of a decoding process of the partial region, the information indicating the size of the partial region of the image and the level indicating the load of the decoding process of the partial region both also having been transmitted from the image coding device together with the coded data and received by the image decoding device; and   a decoding unit configured to decode the coded data under control of the control unit,   wherein the partial region is an independently decodable region of the image that is less than an entirety of the image, and the entirety of the image has associated therewith a respective level set for decoding that is different than the level indicating the load of the decoding process of the partial region, and   wherein the control unit and the decoding unit are each implemented via at least one processor.   
     
     
         2 . The image decoding device according to  claim 1 ,
 wherein the control unit is further configured to control decoding of the coded data using information for defining the load of the decoding process of the partial region according to the level indicating the load of the decoding process of the partial region.   
     
     
         3 . The image decoding device according to  claim 1 ,
 wherein the control unit is further configured to control decoding of the coded data using information for defining the load of the decoding process of the partial region according to the information indicating the size of the partial region.   
     
     
         4 . The image decoding device according to  claim 1 ,
 wherein the control unit is further configured to control decoding of the coded data using information for defining the load of the decoding process of the partial region according to information indicating a length in a vertical direction and information indicating a length in a horizontal direction of the partial region.   
     
     
         5 . The image decoding device according to  claim 1 , further comprising
 an acquisition unit configured to acquire information indicating the size of the partial region and the level indicating the load of the decoding process of the partial region as decoding load definition information indicating the load of the decoding process of the partial region,   wherein the control unit is further configured to control decoding of the coded data using the decoding load definition information acquired by the acquisition unit, and   wherein the acquisition unit is implemented via at least one processor.   
     
     
         6 . The image decoding device according to  claim 5 ,
 wherein the acquisition unit is further configured to acquire the decoding load definition information as auxiliary information of the coded data.   
     
     
         7 . The image decoding device according to  claim 6 ,
 wherein the acquisition unit is further configured to acquire the decoding load definition as supplemental enhancement information (SEI) of an independently decodable partial region.   
     
     
         8 . The image coding device according to  claim 7 ,
 wherein the coded data includes image data of a plurality of layers, and   wherein the acquisition unit is further configured to acquire the decoding load definition information of the plurality of layers as the SEI.   
     
     
         9 . The image decoding device according to  claim 1 , wherein the partial region is a tile. 
     
     
         10 . The image decoding device according to  claim 1 , wherein the partial region is a set of a plurality of tiles. 
     
     
         11 . The image decoding device according to  claim 1 ,
 wherein the control unit is further configured to control decoding of the coded data using information for defining a maximum magnitude of a load of a decoding process among a plurality of partial regions included in a picture of image data included in the coded data according to a level indicating a load of the decoding process.   
     
     
         12 . The image decoding device according to  claim 1 ,
 wherein the control unit is further configured to control decoding of the coded data using information for defining a load common in a plurality of partial regions included in a picture of image data included in the coded data according to a level indicating a load of the decoding process.   
     
     
         13 . The image decoding device according to  claim 12 ,
 wherein, when a plurality of the partial regions included in the picture have an L shape, the control unit is further configured to control decoding of the coded data using information for defining the load for a rectangular region including the L shape.   
     
     
         14 . The image decoding device according to  claim 1 ,
 wherein the control unit is further configured to control decoding of the coded data using information indicating whether decoding load definition information is set.   
     
     
         15 . An image decoding method comprising:
 receiving, from an image coding device, a coded data in which an image is coded, together with information indicating a size of a partial region of the image and a level indicating a load of a decoding process of the partial region;   controlling, based on the information indicating the size of the partial region of the image and the level indicating the load of the decoding process of the partial region, decoding of the coded data in which the image is coded; and   decoding the coded data according to the controlling,   wherein the partial region is an independently decodable region of the image that is less than an entirety of the image, and the entirety of the image has associated therewith a respective level set for decoding that is different than the level indicating the load of the decoding process of the partial region.   
     
     
         16 . A non-transitory computer-readable medium having embodied thereon a program, which when executed by a computer causes the computer to execute an image decoding method, the method comprising:
 receiving, from an image coding device, a coded data in which an image is coded, together with information indicating a size of a partial region of the image and a level indicating a load of a decoding process of the partial region;   controlling, based on the information indicating the size of the partial region of the image and the level indicating the load of the decoding process of the partial region, decoding of the coded data in which the image is coded; and   decoding the coded data according to the controlling,   wherein the partial region is an independently decodable region of the image that is less than an entirety of the image, and the entirety of the image has associated therewith a respective level set for decoding that is different than the level indicating the load of the decoding process of the partial region.