Image processing apparatus and image processing method

1. An image processing apparatus, comprising:

a predicted vector generation section configured to

exclude, at a time of encoding of a current motion vector of a current block for a prediction using a correlation within an image, in a case where a type of a reference picture of the 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, the candidate block from candidates of the reference motion vector, and

generate a predicted vector of the current motion vector by using the reference motion vector, the reference motion vector being referred to when the predicted vector of the current motion vector is generated;

a list creation section configured to 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

a motion vector encoding section configured to encode the current motion vector using the predicted vector and the list,

wherein the predicted vector generation section is further configured to exclude the reference motion vector when generating the predicted vector of the current motion vector based on the type of the reference picture of the candidate block being Intra Block Copy (Intra BC), and

wherein the predicted vector generation section, the list creation section, and the motion vector encoding section are each implemented via at least one processor.

2. The image processing apparatus according to claim 1 ,

wherein the predicted vector generation section is further configured to

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 Short-Term Reference Picture (STRP), the predicted vector of the current motion vector by performing scaling on the reference motion vector,

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 BC, the predicted vector of the current motion vector by setting the reference motion vector to the predicted vector without scaling, and

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.

3. An image processing method for an image processing apparatus, the image processing method comprising:

excluding, at a time of encoding of a current motion vector of a current block for a prediction using a correlation within an image, in a case where a type of a reference picture of the 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, the candidate block from candidates of the reference motion vector;

generating a predicted vector of the current motion vector by using the reference motion vector, the reference motion vector being referred to when the predicted vector of the current motion vector is generated;

registering a picture of the current block in a predetermined position of a list of candidates of the reference picture of the current block; and

encoding the current motion vector using the predicted vector and the list,

wherein the generating of the predicted vector of the current motion vector includes excluding the reference motion vector when generating the predicted vector of the current motion vector based on the type of the reference picture of the candidate block being Intra Block Copy (Intra BC).

4. A non-transitory computer-readable medium having embodied thereon a program, which when executed by a computer causes the computer to execute an image processing method, the method comprising:

excluding, at a time of encoding of a current motion vector of a current block for a prediction using a correlation within an image, in a case where a type of a reference picture of the 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, the candidate block from candidates of the reference motion vector;

generating a predicted vector of the current motion vector by using the reference motion vector, the reference motion vector being referred to when the predicted vector of the current motion vector is generated;

registering a picture of the current block in a predetermined position of a list of candidates of the reference picture of the current block; and

encoding the current motion vector using the predicted vector and the list,

wherein the generating of the predicted vector of the current motion vector includes excluding the reference motion vector when generating the predicted vector of the current motion vector based on the type of the reference picture of the candidate block being Intra Block Copy (Intra BC).

5. The image processing apparatus according to claim 1 ,

wherein the list creation section 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 1 ,

wherein the predicted vector generation section is further configured to exclude the reference motion vector when generating the predicted vector of the current motion vector based on the type of the reference picture of the current block being Intra BC.

7. The image processing apparatus according to claim 1 ,

wherein the list creation section is further configured to register the picture of the current block in the predetermined position of the list of candidates in ascending order of a difference in Picture Order Count (POC) from a current picture in which the current block is included.