Apparatus and method for performing artificial intelligence encoding and artificial intelligence decoding on image by using pre-processing

An artificial intelligence (AI) encoding apparatus comprising:

• a memory storing one or more instructions;
• and
• a processor configured to execute the one or more instructions stored in the memory,
• wherein the processor is configured to:
• perform pre-processing of changing a resolution of a first original image according to a pre-determined output resolution;
• obtain a first image having the pre-determined output resolution by applying AI down-scaling based on a down-scaling neural network (NN) to a second original image obtained as a result of the pre-processing;
• generate image data by performing first encoding on the first image;
• and transmit the image data.

An artificial intelligence (AI) decoding method performed by an AI decoding apparatus, the AI decoding method comprising:

• obtaining image data generated through first encoding on a first image;
• obtaining a second image corresponding to the first image by performing first decoding on the image data;
• performing pre-processing of changing a resolution of the second image, according to a pre-determined output resolution;
• and
• obtaining a fourth image having the pre-determined output resolution by applying AI up-scaling based on an up-scaling neural network (NN) to a third image obtained as a result of the pre-processing.

An artificial intelligence (AI) encoding method performed by an AI encoding apparatus, the AI encoding method comprising:

• performing pre-processing of changing resolution of a first original image according to a pre-determined output resolution;
• obtaining a first image having the pre-determined output resolution by applying AI down-scaling based on a down-scaling neural network (NN) to a second original image obtained as a result of the pre-processing;
• generating image data by performing first encoding on the first image;
• and
• transmitting the image data.