Similarly, as illustrated in the inter prediction unit 203 on the decoding side in FIG. 22, in a case where the switch 408 is connected to the subblock motion vector predictor mode derivation unit 403 during the decoding process, the motion compensation prediction unit 406 acquires inter prediction information by the subblock motion vector predictor mode derivation unit 403, and derives an inter prediction mode, a reference index, and a motion vector of a target block, thereby generating a motion compensation prediction signal. The constructed motion compensation prediction signal is supplied to the decoded picture signal superimposer 207.
Motion Compensation Process Based on Subblock Merge Mode
As illustrated in the inter prediction unit 102 on the coding side in FIG. 16, in a case where inter prediction information by the subblock merge mode derivation unit 304 has been selected on the inter prediction mode determiner 305, the motion compensation prediction unit 306 acquires this inter prediction information from the inter prediction mode determiner 305, and derives an inter prediction mode, a reference index, and a motion vector of current target block, thereby generating a motion compensation prediction signal. The constructed motion compensation prediction signal is supplied to the prediction method determiner 105.
