Video coding device, method, and apparatus and inter-frame mode selection method and apparatus therefor

An inter-frame mode selection apparatus for video coding, the inter-frame mode selection apparatus comprising:

• at least one memory configured to store computer program code;
• and
• at least one processor configured to access the at least one memory and operate according to the computer program code, the computer program code comprising:
• first determining code configured to cause the at least one processor to determine an optimum coding mode and a coding overhead of a coding unit having a depth;
• processing code configured to cause the at least one processor to divide the coding unit into coding subunits having the depth that is incremented by 1;
• comparing code configured to cause the at least one processor to determine a sum of coding overheads of the coding subunits into which the coding unit is divided;
• and
• second determining code configured to cause the at least one processor to, based on the determined coding overhead of the coding unit being greater than the determined sum of the coding overheads of the multiple coding subunits, determine that the optimum coding mode of the coding unit is optimum after the coding unit is divided into the coding subunits.

A non-transitory computer-readable storage medium storing instructions that cause a processor to perform an inter-frame mode selection method to:

• determine an optimum coding mode and a coding overhead of a coding unit having a depth;
• divide the coding unit into coding subunits having the depth that is incremented by 1;
• determine a sum of coding overheads of the coding subunits into which the coding unit is divided;
• and
• based on the determined coding overhead of the coding unit being greater than the determined sum of the coding overheads of the multiple coding subunits, determine that the optimum coding mode of the coding unit is optimum after the coding unit is divided into the coding subunits.