Motion compensation method and device using bidirectional optical flow
摘要
說(shuō)明書(shū)
For each prediction direction, the motion information includes a reference index and a motion vector. The reference index may be used to identify the reference picture in the current reference picture list (Ref PicList0 or Ref PicList1). The motion vector has a horizontal component x and a vertical component y. In general, the horizontal component represents horizontal displacement in the reference picture relative to the position of the current blocks in the current picture, which is needed to locate the x coordinate of the reference block. The vertical component represents a vertical displacement in the reference picture relative to the position of the current blocks, which is needed to locate the y coordinate of the reference block.
The inter-predictor 124 generates a prediction block for the current block through a motion compensation procedure. The inter-predictor 124 searches for a block most similar to the current block in a reference picture encoded and decoded earlier than the current picture, and generates a prediction block for the current block using the searched block. Then, the inter-predictor generates a motion vector corresponding to a displacement between the current block in the current picture and the prediction block in the reference picture. In general, motion estimation is performed on a luma component, and a motion vector calculated based on the luma component is used for both the luma component and the chroma component. The motion information including the information about the reference picture and a motion vector used to predict the current block is encoded by the encoder 150 and transmitted to the video decoding apparatus.
