Method and device for video signal processing

A method of decoding a video, the method comprising:

• determining whether to divide a first depth coding block into three coding blocks or not;
• when it is determined to divide the first depth coding block, dividing the first depth coding block into three second depth coding blocks in a vertical direction or in a horizontal direction, one among the three second depth coding blocks having ½ size of the first depth coding block and the others among the three second depth coding blocks having ¼ size of the first depth coding block;
• and
• dividing one of the three second depth coding blocks into two third depth coding blocks,
• wherein a division of the second depth coding block is performed in a vertical direction or in a horizontal direction, and
• wherein whether it is allowed to divide the second depth coding block in the vertical direction or in the horizontal direction is determined based on an index of the second depth coding block.

A method of encoding a video, the method comprising:

• determining whether to divide a first depth coding block into three coding blocks or not;
• when it is determined to divide the first depth coding block, dividing the first depth coding block into three second depth coding blocks in a vertical direction or in a horizontal direction, one among the three second depth coding blocks having ½ size of the first depth coding block and the others among the three second depth coding blocks having ¼ size of the first depth coding block;
• and
• dividing one of the three second depth coding blocks into two third depth coding blocks,
• wherein a division of the second depth coding block is performed in a vertical direction or in a horizontal direction, and
• wherein whether it is allowed to divide the second depth coding block in the vertical direction or in the horizontal direction is determined based on an index of the second depth coding block.

A non-transitory computer-readable medium for storing data associated with a video signal, comprising:

• a data stream stored in the non-transitory computer-readable medium, the data stream being encoded by an encoding method which comprising:
• determining whether to divide a first depth coding block into three coding blocks or not;
• when it is determined to divide the first depth coding block, dividing the first depth coding block into three second depth coding blocks in a vertical direction or in a horizontal direction, one among the three second depth coding blocks having ½ size of the first depth coding block and the others among the three second depth coding blocks having ¼ size of the first depth coding block;
• and
• dividing one of the three second depth coding blocks into two third depth coding blocks,
• wherein a division of the second depth coding block is performed in a vertical direction or in a horizontal direction, and
• wherein whether it is allowed to divide the second depth coding block in the vertical direction or in the horizontal direction is determined based on an index of the second depth coding block.