Motion estimation method, apparatus, and storage medium

An information processing apparatus, comprising:

• processing circuitry configured to
• for a predicting unit (PU) in a to-be-coded image, construct a candidate motion vector (MV) list for the PU based on advanced motion vector prediction (AMVP), the candidate MV list including at least one MV of the PU;
• calculate a rate distortion (RD) cost value of each MV in the candidate MV list;
• obtain a target MV of the AMVP corresponding to the smallest RD cost value of the AMVP from a result of the calculation;
• perform integer motion estimation (IME) on the PU based on a mapping point of the target MV of the AMVP in a reference frame as an initially selected point;
• obtain a target MV of the IME from the results of the calculation;
• converting the target MV of the IME to quarter pixel precision, to obtain a reference target MV of quarter motion estimation QME;
• and
• determine the target MV of the AMVP and the smallest RD cost value of the AMVP as a final result of a motion estimation process in a case that the target MV of the AMVP and the reference target MV of the QME are the same.

A non-transitory computer readable storage medium, storing instructions which when executed by at least one processor cause the at least one processor to perform:

• for a predicting unit (PU) in a to-be-coded image, constructing a candidate motion vector (MV) list for the PU based on advanced motion vector prediction (AMVP), the candidate MV list including at least one MV of the PU;
• calculating a rate distortion (RD) cost value of each MV in the candidate MV list;
• obtaining a target MV of the AMVP corresponding to the smallest RD cost value of the AMVP from a result of the calculation;
• performing integer motion estimation (IME) on the PU based on a mapping point of the target MV of the AMVP in a reference frame as an initially selected point;
• obtaining a target MV of the IME from the result of the calculation;
• converting the target MV of the IME to quarter pixel precision, to obtain a reference target MV of quarter motion estimation (QME);
• and
• determining the target MV of the AMVP and the smallest RD cost value of the AMVP as a final result of a motion estimation process in a case that the target MV of the AMVP and the reference target MV of the QME are the same.