Back to results
US 11,695,949 B2Granted
Prediction image generation device
AssigneeSharp Kabushiki Kaisha
InventorsTomohiro Ikai, Tomoyuki Yamamoto
Life of this patent
Estimating the term…
Abstract
At least one of a vector candidate derivation unit and a merge candidate derivation unit derives a motion vector of each of multiple sub-blocks contained in a decoding target block by referring to motion vectors at multiple control points including two points at an interval which is longer than one side of the target block, and a prediction image generation unit refers to the motion vector of each sub-block to generate a prediction image.
Claims4
A prediction image generation device for generating a prediction image, the prediction image generation device comprising:
- vector candidate derivation circuitry that derives a first control point motion vector, a second control point motion vector, and a third control point motion vector based on availabilities for neighboring blocks neighboring a target block;
- prediction vector compute circuitry that derives:
- (i) an X component of a motion vector for a subblock by using (a) an X component of the first control point motion vector, (b) a first motion vector difference between an X component of the second control point motion vector and the X component of the first control point motion vector, and (c) a second motion vector difference between an X component of the third control point motion vector and the X component of the first control point motion vector,
- (ii) a Y component of the motion vector for the subblock by using (a) a Y component of the first control point motion vector, and (b) a third motion vector difference between a Y component of the second control point motion vector and the Y component of the first control point motion vector, and (c) a fourth motion vector difference between a Y component of the third control point motion vector and the Y component of the first control point motion vector,
- wherein the second motion vector difference and the fourth motion vector difference are derived in a case that a number of control point motion vectors is equal to three;
- and
- prediction image generation circuitry that derives the prediction image by using the motion vector for the subblock,
- wherein a precision for deriving the first control point motion vector, the second control point motion vector, and the third control point motion vector for an affine prediction is different from a precision for deriving a motion vector for a non-affine prediction.
5 more elements
A prediction image generation method for generating a prediction image, the prediction image generation method including:
- deriving a first control point motion vector, a second control point motion vector, and a third control point motion vector based on availabilities for neighboring blocks neighboring a target block;
- deriving:
- (i) an X component of a motion vector for a subblock by using (a) an X component of the first control point motion vector, (h) a first motion vector difference between an X component of the second control point motion vector and the X component of the first control point motion vector, and (c) a second motion vector difference between an X component of the third control point motion vector and the X component of the first control point motion vector,
- (ii) a Y component of the motion vector for the subblock by using (a) a Y component of the first control point motion vector, and (b) a third motion vector difference between a Y component of the second control point motion vector and the Y component of the first control point motion vector, and (c) a fourth motion vector difference between a Y component of the third control point motion vector and the Y component of the first control point motion vector,
- wherein the second motion vector difference and the fourth motion vector difference are derived in a case that a number of control point motion vectors is equal to three;
- and
- deriving the prediction image by using the motion vector for the subblock,
- wherein a precision for deriving the first control point motion vector, the second control point motion vector, and the third control point motion vector for an affine prediction is different from a precision for deriving a motion vector for a non-affine prediction.
5 more elements
Dependencies are inferred from the claim text.