Image encoding device and method and image decoding device and method

Abstract

The present disclosure relates to an image encoding device and method and an image decoding device and method, which are capable of suppressing an increase in encoding or decoding workload. A current layer of image data including a plurality of layers is encoded and/or decoded with reference to encoding-related information of some areas, of another layer encoded for each of a plurality of certain areas obtained by dividing a picture, according to control of control information used to control the certain area in which the encoding-related information of the other layer is referred to regarding the current layer of the image data. The present disclosure can be applied to image processing devices such as an image encoding device for performing scalable coding on image data and an image decoding device for decoding an encoded data obtained by performing scalable coding on image data

1 . An image encoding device comprising:
 a generation section configured to generate control information used to control a certain area in which encoding-related information, of another layer encoded for each of a plurality of certain areas obtained by dividing a picture, is referred to regarding a current layer of image data including a plurality of layers;   an encoding section configured to encode the current layer of the image data with reference to the encoding-related information of some areas of the other layer according to control of the control information generated by the generation section; and   a transmission section configured to transmit encoded data of the image data generated by the encoding section and the control information generated by the generation section.   
     
     
         2 - 20 . (canceled) 
     
     
         21 . The image encoding device according to  claim 1 ,
 wherein the control information designates an area in which reference to the encoding-related information of the other layer is permitted.   
     
     
         22 . The image encoding device according to  claim 1 ,
 wherein the control information designates an area in which reference to the encoding-related information of the other layer is prohibited.   
     
     
         23 . The image encoding device according to  claim 1 ,
 wherein the control information designates an area in which the encoding-related information of the other layer is referred to.   
     
     
         24 . The image encoding device according to  claim 21 ,
 wherein the control information designates the area using an identification number allocated in a raster scan order.   
     
     
         25 . The image encoding device according to  claim 22 ,
 wherein the control information designates the area using an identification number allocated in a raster scan order.   
     
     
         26 . The image encoding device according to  claim 23 ,
 wherein the control information designates the area using an identification number allocated in a raster scan order.   
     
     
         27 . The image encoding device according to  claim 21 ,
 wherein the control information designates the area using information indicating a position of the area in a picture.   
     
     
         28 . The image encoding device according to  claim 22 ,
 wherein the control information designates the area using information indicating a position of the area in a picture.   
     
     
         29 . The image encoding device according to  claim 23 ,
 wherein the control information designates the area using information indicating a position of the area in a picture.   
     
     
         30 . The image encoding device according to  claim 1 ,
 wherein the generation section further generates information indicating whether or not an area division of the current layer is similar to an area division of the other layer.   
     
     
         31 . The image encoding device according to  claim 1 ,
 wherein the generation section generates control information determination information serving as information used to control whether or not control information is transmitted, and generate the control information based on the control information determination information.   
     
     
         32 . The image encoding device according to  claim 1 ,
 wherein the transmission section further transmits information indicating whether or not to control an area in which the encoding-related information is referred to.   
     
     
         33 . The image encoding device according to  claim 1 ,
 wherein the encoding-related information is information used for generation of a prediction image used in encoding of the image data.   
     
     
         34 . The image encoding device according to  claim 33 ,
 wherein the information used for the generation of the prediction image includes information used for texture prediction of the image data and information used for syntax prediction of the image data, and   the control information is information used to independently control an area in which the information used for the texture prediction is referred to and an area in which the information used for the syntax prediction is referred to.   
     
     
         35 . The image encoding device according to  claim 1 ,
 wherein the generation section generates the control information for each of the plurality of certain areas obtained by dividing the picture of the current layer of the image data, and   the encoding section encodes the current layer of the image data with reference to the encoding-related information of some areas of the other layer for each of the areas according to control of the control information of each area generated by the generation section.   
     
     
         36 . The image encoding device according to  claim 1 ,
 wherein the area is a slice or a tile of the image data.   
     
     
         37 . An image encoding method comprising:
 generating control information used to control a certain area in which encoding-related information, of another layer encoded for each of a plurality of certain areas obtained by dividing a picture, is referred to regarding a current layer of image data including a plurality of layers;   encoding the current layer of the image data with reference to the encoding-related information of some areas of the other layer according to control of the generated control information; and   transmitting encoded data generated by encoding the image data and the generated control information.   
     
     
         38 . An image decoding device comprising:
 a reception section configured to receive encoded data of a current layer of image data including a plurality of layers and control information used to control a certain area in which encoding-related information, of another layer encoded for each of a plurality of certain areas obtained by dividing a picture of the image data, is referred to; and   a decoding section configured to decode the encoded data with reference to the encoding-related information of some areas of the other layer according to control of the control information received by the reception section.   
     
     
         39 . The image decoding device according to  claim 38 ,
 wherein the control information designates an area in which reference to the encoding-related information of the other layer is permitted.   
     
     
         40 . The image decoding device according to  claim 38 ,
 wherein the control information designates an area in which reference to the encoding-related information of the other layer is prohibited.   
     
     
         41 . The image decoding device according to  claim 38 ,
 wherein the control information designates an area in which the encoding-related information of the other layer is referred to.   
     
     
         42 . The image decoding device according to  claim 39 ,
 wherein the control information designates the area using an identification number allocated in a raster scan order.   
     
     
         43 . The image decoding device according to  claim 40 ,
 wherein the control information designates the area using an identification number allocated in a raster scan order.   
     
     
         44 . The image decoding device according to  claim 41 ,
 wherein the control information designates the area using an identification number allocated in a raster scan order.   
     
     
         45 . The image decoding device according to  claim 39 ,
 wherein the control information designates the area using information indicating a position of the area in a picture.   
     
     
         46 . The image decoding device according to  claim 40 ,
 wherein the control information designates the area using information indicating a position of the area in a picture.   
     
     
         47 . The image decoding device according to any of  claim 41 ,
 wherein the control information designates the area using information indicating a position of the area in a picture.   
     
     
         48 . The image decoding device according to  claim 38 ,
 wherein the reception section further receives information indicating whether or not an area division of the current layer is similar to an area division of the other layer.   
     
     
         49 . The image decoding device according to  claim 38 ,
 wherein the reception section receives control information determination information serving as information used to control whether or not control information is transmitted, and receives the control information based on the control information determination information.   
     
     
         50 . The image decoding device according to  claim 38 ,
 wherein the reception section further receives information indicating whether or not to control an area in which the encoding-related information is referred to.   
     
     
         51 . The image decoding device according to  claim 38 ,
 wherein the encoding-related information is information used for generation of a prediction image used in decoding of the image data.   
     
     
         52 . The image decoding device according to  claim 51 ,
 wherein the information used for the generation of the prediction image includes information used for texture prediction of the image data and information used for syntax prediction of the image data, and   the control information is information used to independently control an area in which the information used for the texture prediction is referred to and an area in which the information used for the syntax prediction is referred to.   
     
     
         53 . The image decoding device according to  claim 38 ,
 wherein the reception section receives the encoded data encoded for each of the plurality of certain areas obtained by dividing the picture of the current layer of the image data and the control information of each of the areas, and   the decoding section decodes the encoded data received by the reception section with reference to the encoding-related information of some areas of the other layer for each of the areas according to control of the control information of each area.   
     
     
         54 . The image decoding device according to  claim 38 ,
 wherein the area is a slice or a tile of the image data.   
     
     
         55 . An image decoding method comprising:
 receiving encoded data of a current layer of image data including a plurality of layers and control information used to control a certain area in which encoding-related information, of another layer encoded for each of a plurality of certain areas obtained by dividing a picture of the image data, is referred to; and   decoding the encoded data with reference to the encoding-related information of some areas of the other layer according to control of the received control information.