Method and device for determining transform block size

A method for determining a transform block size in an image device, the method comprising:

• obtaining by the image device, according to image block information and a splitting manner of an image block, a parameter of a transform block corresponding to the image block, wherein the image device comprises a processor;
• and
• obtaining, by the image device, a transform block size according to the parameter of the transform block and the splitting manner of the image block;
• wherein the obtaining a transform block size according to the parameter of the transform block and the splitting manner of the image block comprises:
• obtaining a first size of the transform block according to the parameter;
• and
• obtaining the transform block size according to the first size;
• wherein a horizontal size of the transform block is equal to h times the first size, and a vertical size of the transform block is equal to v times the first size;
• and h and v are greater than 0.

A device for determining a transform block size in an image system, comprising:

• a parameter acquiring unit, configured to obtain, according to image block information and a splitting manner of an image block, a parameter of a transform block corresponding to the image block;
• and
• a size acquiring unit, configured to obtain a transform block size according to the parameter of the transform block and the splitting manner of the image block;
• wherein a horizontal size of the transform block obtained by the size acquiring unit is greater than a vertical size of the transform block when a horizontal size of a prediction block is greater than a vertical size of the prediction block;
• or
• an obtained vertical size of the transform block is greater than a horizontal size of the transform block when a vertical size of a prediction block is greater than a horizontal size of the prediction block;
• or
• an obtained horizontal size of the transform block is equal to a vertical size of the transform block when a horizontal size of a prediction block is equal to a vertical size of the prediction block.

A method for determining a transform block size in an image device, the method comprising:

• obtaining, by the image device, a splitting parameter according to a splitting manner of an image block and a parameter of a transform block, wherein the image device comprises a processor;
• and
• obtaining, by the image device, a transform block size according to the splitting parameter;
• wherein
• when the splitting manner of the image block is 2N×N or N×2N and a splitting layer number corresponding to the transform block is 0, a value of the splitting parameter is 1;
• 2N×N indicates that a current image block is split into one upper image sub-block and one lower image sub-block of a same size, and N×2N indicates that the current image block is split into one left image sub-block and one right image sub-block of a same size;
• or
• when the splitting manner of the image block is 2N×nU, 2N×nD, nL×2N, or nR×2N and a splitting layer number corresponding to the transform block is 0 or 1, a value of the splitting parameter is 1;
• wherein 2N×nU and 2N×nD indicate that a current image block is split into one upper rectangular image sub-block and one lower rectangular image sub-block of different sizes;
• and
• nL×2N and nR×2N indicate that the current image block is split into one left rectangular image sub-block and one right rectangular image sub-block of different sizes.

A method for determining a transform block size in an image device, the method comprising:

• obtaining, by the image device, a splitting parameter according to a splitting manner of an image block and a parameter of a transform block, wherein the image device comprises a processor;
• and
• obtaining, by the image device, a transform block size according to the splitting parameter;
• wherein the obtaining a splitting parameter according to a splitting manner of an image block and a parameter of a transform block, and obtaining a transform block size according to the splitting parameter further comprises:
• obtaining, when the splitting manner of the image block is 2N×nU, 2N×nD, nL×2N, or nR×2N and a value of the splitting parameter is 1, a parameter identifying whether further splitting is required;
• and
• obtaining, according to the splitting parameter and the parameter identifying whether further splitting is required, a maximum number of transform block layers corresponding to the transform block.

A method for determining a transform block size in an image device, the method comprising:

• obtaining, by the image device, a splitting parameter according to a splitting manner of an image block and a parameter of a transform block, wherein the image device comprises a processor;
• and
• obtaining, by the image device, a transform block size according to the splitting parameter;
• wherein
• when the splitting manner of the image block is 2N×N or N×2N, a maximum number of transform block layers corresponding to the transform block is 1;
• 2N×N indicates that a current image block is split into one upper image sub-block and one lower image sub-block of a same size, and N×2N indicates that the current image block is split into one left image sub-block and one right image sub-block of a same size;
• or
• when the splitting manner of the image block is 2N×nU, 2N×nD, nL×2N, or nR×2N, a maximum number of transform block layers corresponding to the transform block is 2;
• wherein 2N×nU and 2R×nD indicate that a current image block is split into one upper rectangular image sub-block and one lower rectangular image sub-block of different sizes;
• and
• nL×2N and nR×2N indicate that the current image block is split into one left rectangular image sub-block and one right rectangular image sub-block of different sizes.