Local illumination compensation (LIC) for virtual pipeline data units (VPDUS)

An apparatus for processing video data, the apparatus comprising:

• at least one memory;
• and
• one or more processors implemented in circuitry and configured to:
• obtain a current block of a picture of the video data;
• determine the current block includes more than one virtual pipeline data unit (VPDU);
• obtain, for illumination compensation, current neighbor samples for the current block, the current neighbor samples including samples from one or more of a first row of samples from a first neighboring block of a first VPDU included in the current block or a first column of samples from a second neighboring block of the first VPDU;
• obtain, for illumination compensation, reference neighbor samples for the current block, the reference neighbor samples including samples from one or more of a first row of samples from a first neighboring block of a reference block or a first column of samples from a second neighboring block of the reference block;
• obtain, for illumination compensation, additional neighbor samples for the current block that are different from the current neighbor samples and the reference neighbor samples, the additional neighbor samples including samples from one or more of a second row of samples from the first neighboring block of the first VPDU that is different from the first row of samples from the first neighboring block of the first VPDU, a second column of samples from the second neighboring block of the first VPDU that is different from the first column of samples from the second neighboring block of the first VPDU, a second row of samples from the first neighboring block of the reference block that is different from the first row of samples from the first neighboring block of the reference block, a second column of samples from the second neighboring block of the reference block that is different from the first column of samples from the second neighboring block of the reference block, or samples from a neighboring block of a second VPDU included in the current block;
• determine one or more illumination compensation parameters for the current block using the current neighbor samples, the reference neighbor samples, and the additional neighbor samples, the additional neighbor samples being used for determining the one or more illumination compensation parameters based on the current block covering more than one VPDU;
• and
• perform illumination compensation for the current block of the picture using the one or more illumination compensation parameters.

A non-transitory computer-readable medium having stored thereon instructions that, when executed by one or more processors, cause the one or more processors to:

• obtain a current block of a picture of video data;
• determine the current block includes more than one virtual pipeline data unit (VPDU);
• obtain, for illumination compensation, current neighbor samples for the current block, the current neighbor samples including samples from one or more of a first row of samples from a first neighboring block of a first VPDU included in the current block or a first column of samples from a second neighboring block of the first VPDU;
• obtain, for illumination compensation, reference neighbor samples for the current block, the reference neighbor samples including samples from one or more of a first row of samples from a first neighboring block of a reference block or a first column of samples from a second neighboring block of the reference block;
• obtain, for illumination compensation, additional neighbor samples for the current block that are different from the current neighbor samples and the reference neighbor samples, the additional neighbor samples including samples from one or more of a second row of samples from the first neighboring block of the first VPDU that is different from the first row of samples from the first neighboring block of the first VPDU, a second column of samples from the second neighboring block of the first VPDU that is different from the first column of samples from the second neighboring block of the first VPDU, a second row of samples from the first neighboring block of the reference block that is different from the first row of samples from the first neighboring block of the reference block, a second column of samples from the second neighboring block of the reference block that is different from the first column of samples from the second neighboring block of the reference block, or samples from a neighboring block of a second VPDU included in the current block;
• determine one or more illumination compensation parameters for the current block using the current neighbor samples, the reference neighbor samples, and the additional neighbor samples, the additional neighbor samples being used for determining the one or more illumination compensation parameters based on the current block covering more than one VPDU;
• and
• perform illumination compensation for the current block of the picture using the one or more illumination compensation parameters.