Methods and devices for motion storage in geometric partitioning mode

An apparatus, comprising:

• one or more processors;
• and
• a memory coupled to the one or more processors and configured to store instructions executable by the one or more processors, wherein the one or more processors, upon execution of the instructions, are configured to perform operations comprising:
• obtaining at least one motion vector of a first motion vector or a second motion vector from the bitstream, wherein a coding unit is geometrically partitioned into a first part of a geometric partition and a second part of the geometric partition for prediction in a geometric partitioning mode, and the first motion vector is from the first part and the second motion vector is from the second part;
• determining a value of a stored motion vector type based on a motion index and a part index;
• and
• storing a motion vector in a corresponding motion field based on the value of the stored motion vector type, wherein the motion vector comprises the first motion vector, the second motion vector or a combined motion vector obtained based on the first motion vector and the second motion vector,
• wherein the geometric partitioning mode is intra and inter prediction,
• in response to determining that the value of the stored motion vector type is 2, storing a motion vector of inter partition in a corresponding motion field,
• wherein in a case that the first part of the geometric partition is an intra partition and the second part of the geometric partition is an inter partition,
• in response to determining that the value of the stored motion vector type is 0, storing no motion vector in the corresponding motion field, or
• in response to determining that the value of the stored motion vector type is 1, storing the motion vector of the inter partition in the corresponding motion field, wherein the motion vector of the inter partition is the second motion vector.

A method for storing a bitstream, comprising:

• generating a bitstream using an encoding method, and
• storing the bitstream on a non-transitory computer-readable storage medium,
• wherein the encoding method comprises:
• obtaining at least one motion vector of a first motion vector or a second motion vector, wherein a coding unit is geometrically partitioned into a first part of a geometric partition and a second part of the geometric partition for prediction in a geometric partitioning mode, and the first motion vector is from the first part and the second motion vector is from the second part;
• determining a value of a stored motion vector type based on a motion index and a part index;
• and
• storing a motion vector in a corresponding motion field based on the value of the stored motion vector type, wherein the motion vector comprises the first motion vector, the second motion vector, or a combined motion vector obtained based on the first motion vector and the second motion vector,
• wherein the geometric partitioning mode is intra and inter prediction,
• in response to determining that the value of the stored motion vector type is 2, storing a motion vector of inter partition in a corresponding motion field,
• wherein in a case that the first part of the geometric partition is an intra partition and the second part of the geometric partition is an inter partition,
• in response to determining that the value of the stored motion vector type is 0, storing no motion vector in the corresponding motion field, or
• in response to determining that the value of the stored motion vector type is 1, storing the motion vector of the inter partition in the corresponding motion field, wherein the motion vector of the inter partition is the second motion vector.