Picture encoding method, picture decoding method, picture encoding apparatus, picture decoding apparatus, picture encoding program, and picture decoding program

Abstract

In picture encoding that generates prediction pictures from picture information of frames previously encoded and encodes picture information for each area, the encoding efficiency is improved. A plurality of motion vector candidates are stored in advance in a motion vector storage memory ( 107 ). A motion vector selection section ( 109 ) selects a motion vector to be used from the plurality of motion vectors stored in advance in the motion vector storage memory ( 107 ). A prediction picture generation section ( 104 ) generates a prediction picture from a reference picture using the selected motion vector. A differential encoding section ( 103 ) encodes a differential between the picture information of the present area and the prediction picture. A motion vector designation encoding section ( 110 ) encodes information that designates the motion vector selected by the motion vector selection section ( 109 ).

1 . A picture decoding apparatus that decodes picture information for an area by generating prediction pictures from picture information of frames that have been previously decoded, the picture decoding apparatus comprising:
 a motion vector selection section that selects a motion vector from a plurality of motion vectors that have been stored in advance, where each of the plurality of motion vectors is related to one of a plurality of layers that are provided for scalable encoding;   a prediction picture generation section that generates a prediction picture from a reference picture using the motion vector selected by the motion vector selection section;   and a decoded picture generation section that generates a decoded picture by decoding a difference between the picture information for the area and the prediction picture.   
     
     
         2 . A picture decoding method that decodes picture information for an area by generating prediction pictures from picture information of frames that have been previously decoded, the picture decoding method comprising:
 selecting a motion vector from a plurality of motion vectors that have been stored in advance, where each of the plurality of motion vectors is related to one of a plurality of layers that are provided for scalable encoding;   generating a prediction picture from a reference picture using the selected motion vector; and   generating a decoded picture by decoding a difference between the picture information for the area and the prediction picture.   
     
     
         3 . A non-transitory computer-readable recording medium storing a picture decoding program for causing a computer to execute the picture decoding method according to  claim 2 .