Image prediction method and apparatus

An image prediction apparatus, comprising:

• a non-transitory memory storing instructions;
• and
• a processor coupled to the non-transitory memory and executing the instructions, wherein the instructions cause the image prediction apparatus to be configured to:
• obtain predicted motion information of an image block;
• determine an initial predicted block of the image block according to the predicted motion information and a reference image of the image block;
• perform, according to the predicted motion information, L iterative searches in the reference image using an integer pixel step size to obtain an intermediate predicted block of the image block, wherein L is a preset value and is an integer greater than 1;
• perform a single search in the reference image using a fractional pixel step size to obtain M predicted blocks of the image block, wherein M is a preset value and is an integer greater than 1;
• determine a target predicted block of the image block according to the M predicted blocks and the intermediate predicted block;
• and
• obtain a predicted value of a pixel value of the image block according to a pixel value of the target predicted block.

An image prediction method, comprising:

• obtaining predicted motion information of an image block;
• determining an initial predicted block of the image block according to the predicted motion information and a reference image of the image block;
• performing, according to the predicted motion information, a single search in the reference image using an integer pixel step size to obtain M predicted blocks of the image block, wherein M is a preset value and is an integer greater than 1;
• determining an intermediate predicted block of the image block according to the M predicted blocks and the initial predicted block;
• determining that the intermediate predicted block is the initial predicted block;
• determining that information about motion of the image block toward the intermediate predicted block is the predicted motion information;
• performing, according to the predicted motion information, L iterative searches in the reference image using a fractional pixel step size to obtain a target predicted block of the image block, wherein L is a preset value and is an integer greater than 1;
• and
• obtaining a predicted value of a pixel value of the image block according to a pixel value of the target predicted block.

An image prediction apparatus, comprising:

• a non-transitory memory storing instructions;
• and
• a processor coupled to the non-transitory memory and executing the instructions, wherein the instructions cause the image prediction apparatus to be configured to:
• determine an initial predicted block of the image block according to the predicted motion information and a reference image of the image block;
• perform, according to the predicted motion information, a single search in the reference image using an integer pixel step size to obtain M predicted blocks of the image block, wherein M is a preset value and is an integer greater than 1;
• determine an intermediate predicted block of the image block according to the M predicted blocks and the initial predicted block;
• determine that the intermediate predicted block is the initial predicted block;
• determine that information about motion of the image block toward the intermediate predicted block is the predicted motion information;
• perform, according to the predicted motion information, L iterative searches in the reference image using a fractional pixel step size, to obtain a target predicted block of the image block, wherein L is a preset value and is an integer greater than 1;
• and
• obtain a predicted value of a pixel value of the image block according to a pixel value of the target predicted block.