Patent AU-2020201373-B2 (AU)
Title: Image prediction encoding device, image prediction encoding method, image prediction encoding program, image prediction decoding device, image prediction decoding method, and image prediction decoding program
Inventor: SUZUKI YOSHINORI
IPC: H04N19/55
Filed: 2020-02-25
Granted: 2020-12-17
Abstract: IMAGE PREDICTION ENCODING DEVICE, IMAGE PREDICTION 
ENCODING METHOD, IMAGE PREDICTION ENCODING PROGRAM, 
IMAGE PREDICTION DECODING DEVICE, IMAGE PREDICTION 
DECODING METHOD, AND IMAGE PREDICTION DECODING 
PROGRAM 
ABSTRACT 
Disclosed is an image predictive decoding method executed by a processor of an image 
predictive decoding device to implement, the method comprising: extracting encoded data of 
prediction information to indicate a prediction method to be used in prediction of a signal of a 
target region serving as a decoding target and encoded data of a residual signal, from 
compressed image data obtained by partitioning an image into a plurality of regions and 
encoding image data of the regions; restoring motion information based on the encoded data of 
prediction information, wherein the image predictive decoding device restores a prediction 
block partitioning type indicating a number of prediction regions obtained by sub-partitioning 
the target region, based on the encoded data of prediction information, wherein, when the 
prediction block partitioning type indicates that the target region includes a first prediction 
region and a second prediction region, the image predictive decoding device further decodes the 
encoded data of prediction information to restore a first merge identification information 
indicating whether or not to utilize candidates for motion information including at least one of 
decoded motion information associated with neighboring regions neighboring the first 
prediction region and motion information that indicates a zero vector for generating a predicted 
signal of the first prediction region, wherein, when the first merge identification information 
indicates not to utilize the candidates for motion information, the image predictive decoding 
device further decodes the encoded data of prediction information to restore a first motion 
information utilized for generating the predicted signal of the first prediction region, wherein, 
when the first merge identification information indicates to utilize the candidates for motion 
information, the image predictive decoding device further decodes the encoded data of 
prediction information to restore a first selection information identifying the first motion 
information utilized for generating the predicted signal of the first prediction region based on the 
candidates for motion information and to restore the first motion information based on the first 
selection information, wherein, the image predictive decoding device further decodes the
encoded data of prediction information to restore a second merge identification information 
indicating whether or not to utilize decoded motion information associated with neighboring 
regions neighboring the second prediction region for generating a predicted signal of the second 
prediction region, wherein, when the second merge identification information indicates not to 
utilize the decoded motion information, the image predictive decoding device further decodes 
the encoded data of prediction information to restore a second motion information utilized for 
generating the predicted signal of the second prediction region, and wherein, when the second 
merge identification information indicates to utilize the decoded motion information, the image 
predictive decoding device further decodes the encoded data of prediction information to restore 
a second selection information identifying the second motion information utilized for generating 
the predicted signal of the second prediction region based on candidate for the decoded motion 
information except the first motion information from among the decoded motion information 
associated with neighboring regions neighboring the second prediction region, and to restore the 
second motion information based on the second selection information; storing motion 
information included in restored prediction information; generating a predicted signal of each of 
the first and second prediction regions in the target region based on the restored first motion 
information and the restored second motion information; restoring a reconstructed residual 
signal of the target region based on the encoded data of the residual signal; and generating a 
restored pixel signal of the target region based on the predicted signal and the reconstructed 
residual signal and to store the restored pixel signal as the previously-reconstructed signal.