Image predictive encoding and decoding system

Abstract

In image predictive encoding according to an embodiment, one or more motion information sets are derived from plural pieces of motion information stored in a computer readable storage medium. Each of the one or more information sets includes two pieces of motion information between which any one of constituent elements differ in value. A predicted signal of a target region in a picture is generated by motion compensation, using two pieces of motion information in a motion information set selected from the one or more motion information sets. The two pieces of motion information in the selected motion information set are stored in the computer readable storage medium, and are used for generation of a predicted signal of another region.

What is claimed is: 
     
         1 . An image predictive decoding device comprising a circuitry configured to:
 extract encoded data of indication information and encoded data of a residual signal from compressed data, the encoded data of indication information identifying a motion information set utilized for generation of a predicted signal of a target region of a decoding target of a plurality of regions in a picture, out of a plurality of pieces of motion information associated with neighboring regions neighboring the target region in the frame to be decoded and motion information associated with a region in the decoded previous frame;   decode the encoded data of indication information to restore the indication information;   derive, one or more motion information sets out of plural pieces of motion information stored in memory, each of the one or more motion information sets including two pieces of motion information between which respective frame numbers identified with respective reference picture list identification and respective reference picture index are different from each other, or between which respective motion vectors are different from each other;   determine, from the derived one or more motion information sets, a motion information set to be used in generation of the predicted signal of the target region based on the indication information;   generate the predicted signal of the target region by combining two signals obtained from reconstructed pictures stored in the memory based on the motion information set of the motion information associated with neighboring regions neighboring the target region in the frame to be decoded and the motion information associated with a region in the decoded previous frame, or two pieces of motion information associated with neighboring regions neighboring the target region in the frame to be decoded;   store motion information utilized for generation of the predicted signal of the target region in the memory;   restore a residual signal of the target region from the encoded data of the residual signal;   reconstruct a pixel signal of the target region based on the predicted signal and the restored residual signal; and to store the reconstructed pixel signal as a part of a reconstructed picture.   
     
     
         2 . An image predictive decoding method comprising:
 extracting encoded data of indication information and encoded data of a residual signal from compressed data, the encoded data of indication information identifying a motion information set utilized for generation of a predicted signal of a target region of a decoding target of a plurality of regions in a picture, out of a plurality of pieces of motion information associated with neighboring regions neighboring the target region in the frame to be decoded and motion information associated with a region in the decoded previous frame;   decoding the encoded data of indication information to restore the indication information;   deriving one or more motion information sets out of plural pieces of motion information stored in memory, each of the one or more motion information sets including two pieces of motion information between which respective frame numbers identified with respective reference picture list identification and respective reference picture index are different from each other, or between which respective motion vectors are different from each other;   determining from the derived one or more motion information sets, a motion information set to be used in generation of the predicted signal of the target region based on the indication information;   generating the predicted signal of the target region by combining two signals obtained from reconstructed pictures stored in the memory based on the motion information set of the motion information associated with neighboring regions neighboring the target region in the frame to be decoded and the motion information associated with a region in the decoded previous frame, or two pieces of motion information associated with neighboring regions neighboring the target region in the frame to be decoded;   storing motion information utilized for generation of the predicted signal of the target region in the memory;   restoring a residual signal of the target region from the encoded data of the residual signal;   reconstructing a pixel signal of the target region based on the predicted signal and the restored residual signal; and   storing the reconstructed pixel signal as a part of a reconstructed picture.