Image processing apparatus and image processing method
The present disclosure relates to an image processing apparatus and an image processing method that are capable of improving coding efficiency at the time when a prediction using a correlation within a screen is performed. A predicted vector generation section sets, at a time of encoding of a current motion vector of a current block for a prediction using a correlation within a screen, a candidate block to not available and generates a predicted vector of the current motion vector by using a reference motion vector, the reference motion vector being referred to when the predicted vector of the current motion vector is generated. A difference vector generation section generates a difference vector between the current motion vector and the predicted vector generated by the predicted vector generation section. The present disclosure can be applied to, for example, an encoding apparatus.
1. An image processing apparatus, comprising:
circuitry configured to
exclude, in a case where a type of a reference picture of a current block and a type of a reference picture of a candidate block corresponding to a candidate of a reference motion vector are different from each other and neither the type of the reference picture of the current block nor the type of the reference picture of the candidate block is Short-Term Reference Picture (STRP), a motion vector of the candidate block from candidates of the reference motion vector,
generate, in a case where a type of the reference picture of the current block and the type of the reference picture of the candidate block are each STRP, a predicted vector of a current motion vector by performing scaling on the reference motion vector on a basis of a difference in picture order count (POC) between the reference picture of the current block and the reference picture of the candidate block,
generate, in a case where the type of the reference picture of the current block and the type of the reference picture of the candidate block are each Intra Block Copy (Intra BC), the predicted vector of the current motion vector by setting the reference motion vector to the predicted vector without scaling,
generate, in a case where the type of the reference picture of the current block and the type of the reference picture of the candidate block are each Long-Term Reference Picture (LTRP), the predicted vector of the current motion vector by setting the reference motion vector to the predicted vector without scaling,
register a picture of the current block in a predetermined position of a list of candidates of the reference picture of the current block, and
add a difference vector between the current motion vector and the predicted vector to the predicted vector and generate the current motion vector.
2. The image processing apparatus according to claim 1 , wherein
the circuitry is further configured to determine that the type of the reference picture of the current block and the type of the reference picture of the candidate block are different from each other in a case where a picture of the candidate block and the reference picture of the candidate block are different from each other.
3. The image processing apparatus according to claim 2 , wherein the predetermined position is a head of the list of candidates.
4. The image processing apparatus according to claim 1 , wherein the predetermined position is a head of the list of candidates.
5. The image processing apparatus according to claim 1 , wherein
the circuitry is further configured to rearrange order of the candidates of the reference picture in the list, before registering the picture of the current block.
6. The image processing apparatus according to claim 2 , wherein
the circuitry is further configured to rearrange order of the candidates of the reference picture in the list, before registering the picture of the current block.
7. The image processing apparatus according to claim 3 , wherein
the circuitry is further configured to rearrange order of the candidates of the reference picture in the list, before registering the picture of the current block.
8. The image processing apparatus according to claim 4 , wherein
the circuitry is further configured to rearrange order of the candidates of the reference picture in the list, before registering the picture of the current block.
9. The image processing apparatus according to claim 1 , wherein
the circuitry is further configured to rearrange order of the candidates of the reference picture other than the picture of the current block in the list, after registering the picture of the current block.
10. The image processing apparatus according to claim 2 , wherein
the circuitry is further configured to rearrange order of the candidates of the reference picture other than the picture of the current block in the list, after registering the picture of the current block.
11. The image processing apparatus according to claim 3 , wherein
the circuitry is further configured to rearrange order of the candidates of the reference picture other than the picture of the current block in the list, after registering the picture of the current block.
12. An image processing method comprising:
excluding, in a case where a type of a reference picture of a current block and a type of a reference picture of a candidate block corresponding to a candidate of a reference motion vector are different from each other and neither the type of the reference picture of the current block nor the type of the reference picture of the candidate block is Short-Term Reference Picture (STRP), a motion vector of the candidate block from candidates of the reference motion vector;
generating, in a case where a type of the reference picture of the current block and the type of the reference picture of the candidate block are each STRP, a predicted vector of a current motion vector by performing scaling on the reference motion vector on a basis of a difference in picture order count (POC) between the reference picture of the current block and the reference picture of the candidate block;
generating, in a case where the type of the reference picture of the current block and the type of the reference picture of the candidate block are each Intra Block Copy (Intra BC), the predicted vector of the current motion vector by setting the reference motion vector to the predicted vector without scaling;
generating, in a case where the type of the reference picture of the current block and the type of the reference picture of the candidate block are each Long-Term Reference Picture (LTRP), the predicted vector of the current motion vector by setting the reference motion vector to the predicted vector without scaling;
registering a picture of the current block in a predetermined position of a list of candidates of the reference picture of the current block;
adding a difference vector between the current motion vector and the predicted vector to the predicted vector; and
generating the current motion vector using the predicted vector and the list.