Determination of picture partition mode based on block size

An apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:

• determine, based on a dimension of a current video block of a video, whether a first partitioning process that splits the current video block into two sub-blocks or a second partitioning process that splits the current video block into three sub-blocks in a horizontal direction or a vertical direction is allowed or not, wherein the dimension of the current video block comprises a height or a width of the current video block in luma samples;
• and
• perform, based on the determining, a conversion between the current video block and a bitstream of the video,
• wherein the first partitioning process in the vertical direction is disabled in a case where (i) a sum of the width of the current video block in luma samples and a horizontal coordinate of a top-left luma sample of the current video block is greater than a width of a picture or a width of a subpicture comprising the current video block in luma samples and (ii) the height of the current video block in luma samples is greater than N;
• wherein N=64;
• wherein the second partitioning process is disabled in a case where the height or the width of the current video block in luma samples being greater than 64;
• wherein the first partitioning process in the vertical direction is disabled in a case where (i) the width of the current video block in luma samples is less than or equal to N and (ii) the height of the current video block in luma samples is greater than N;
• wherein the first partitioning process in the horizontal direction is disabled in a case where (i) the width of the current video block in luma samples is greater than N and (ii) the height of the current video block in luma samples is less than or equal to N;
• wherein the first partitioning process in the horizontal direction is disabled in a case where (i) a sum of the height of the current video block in luma samples and a vertical coordinate of the top-left luma sample of the current video block is greater than a height of a picture or a height of a subpicture comprising the current video block in luma samples and (ii) the width of the current video block in luma samples is greater than N;
• wherein, it cannot be determined that the first partitioning process in the horizontal direction is disabled only according to a condition that a sum of the width of the current video block in luma samples and a horizontal coordinate of a top-left luma sample of the current video block is greater than a width of a picture comprising the current video block in luma samples;
• and
• wherein the first partitioning process comprises a binary tree (BT) partition, and the second partitioning process comprises a ternary tree (TT) partition.

A non-transitory computer-readable storage medium storing instructions that cause a processor to:

• determine, based on a dimension of a current video block of a video, whether a first partitioning process that splits the current video block into two sub-blocks or a second partitioning process that splits the current video block into three sub-blocks in a horizontal direction or a vertical direction is allowed or not, wherein the dimension of the current video block comprises a height or a width of the current video block in luma samples;
• and
• perform, based on the determining, a conversion between the current video block and a bitstream of the video,
• wherein the first partitioning process in the vertical direction is disabled in a case where (i) a sum of the width of the current video block in luma samples and a horizontal coordinate of a top-left luma sample of the current video block is greater than a width of a picture or a width of a subpicture comprising the current video block in luma samples and (ii) the height of the current video block in luma samples is greater than N;
• wherein N=64;
• wherein the second partitioning process is disabled in a case where the height or the width of the current video block in luma samples being greater than 64;
• wherein the first partitioning process in the vertical direction is disabled in a case where (i) the width of the current video block in luma samples is less than or equal to N and (ii) the height of the current video block in luma samples is greater than N;
• wherein the first partitioning process in the horizontal direction is disabled in a case where (i) the width of the current video block in luma samples is greater than N and (ii) the height of the current video block in luma samples is less than or equal to N;
• wherein the first partitioning process in the horizontal direction is disabled in a case where (i) a sum of the height of the current video block in luma samples and a vertical coordinate of the top-left luma sample of the current video block is greater than a height of a picture or a height of a subpicture comprising the current video block in luma samples and (ii) the width of the current video block in luma samples is greater than N;
• wherein, it cannot be determined that the first partitioning process in the horizontal direction is disabled only according to a condition that a sum of the width of the current video block in luma samples and a horizontal coordinate of a top-left luma sample of the current video block is greater than a width of a picture comprising the current video block in luma samples;
• and
• wherein the first partitioning process comprises a binary tree (BT) partition, and the second partitioning process comprises a ternary tree (TT) partition.

A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises:

• determining, based on a dimension of a current video block of the video, whether a first partitioning process that splits the current video block into two sub-blocks or a second partitioning process that splits the current video block into three sub-blocks in a horizontal direction or a vertical direction is allowed or not, wherein the dimension of the current video block comprises a height or a width of the current video block in luma samples;
• and
• generating the bitstream based on the determining,
• wherein the first partitioning process in the vertical direction is disabled in a case where (i) a sum of the width of the current video block in luma samples and a horizontal coordinate of a top-left luma sample of the current video block is greater than a width of a picture or a width of a subpicture comprising the current video block in luma samples and (ii) the height of the current video block in luma samples is greater than N;
• wherein N=64;
• wherein the second partitioning process is disabled in a case where the height or the width of the current video block in luma samples being greater than 64;
• wherein the first partitioning process in the vertical direction is disabled in a case where (i) the width of the current video block in luma samples is less than or equal to N and (ii) the height of the current video block in luma samples is greater than N;
• wherein the first partitioning process in the horizontal direction is disabled in a case where (i) the width of the current video block in luma samples is greater than N and (ii) the height of the current video block in luma samples is less than or equal to N;
• wherein the first partitioning process in the horizontal direction is disabled in a case where (i) a sum of the height of the current video block in luma samples and a vertical coordinate of the top-left luma sample of the current video block is greater than a height of a picture or a height of a subpicture comprising the current video block in luma samples and (ii) the width of the current video block in luma samples is greater than N;
• wherein, it cannot be determined that the first partitioning process in the horizontal direction is disabled only according to a condition that a sum of the width of the current video block in luma samples and a horizontal coordinate of a top-left luma sample of the current video block is greater than a width of a picture comprising the current video block in luma samples;
• and
• wherein the first partitioning process comprises a binary tree (BT) partition, and the second partitioning process comprises a ternary tree (TT) partition.