Patent AU-2020201375-A1 (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
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 Disclosed is an image predictive decoding method executed by an image predictive decoding device, comprising: a data analysis step of 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; prediction information decoding step of 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 is vertically partitioned into a first prediction region on the left side and a second prediction region on the right side, 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 decoded motion information associated with neighboring regions, except a neighboring region generated by intra-picture prediction, neighboring the first prediction region 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 and a plurality of candidates for the decoded motion information exist, 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 and motion information of a plurality of upper regions neighboring the second prediction region at an upper side of the second prediction region coinciding with 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; a storing step of storing motion information included in restored prediction information; a predicted signal generation step of 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; a residual signal restoration step of restoring a reconstructed residual signal of the target region based on the encoded data of the residual signal; and a recording step of 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.