Artificial intelligence encoding and artificial intelligence decoding methods and apparatuses using deep neural network

An electronic device for displaying an image by using an artificial intelligence (AI), the electronic device comprising:

• a display;
• and
• one or more processors configured to execute one or more instructions stored in the electronic device to:
• receive image data corresponding to an encoding result on a first image;
• receive AI data related to AI down-scaling an original image to the first image, the AI data comprising artifact information and a bitrate of the image data being used to select first neural network (NN) setting information, the artifact information comprising a location of an artifact region in the first image;
• obtain a second image by decoding the image data;
• based on the AI data, select the first NN setting information from a plurality of first NN setting information that is pre-stored in the electronic device;
• obtain a third image by performing AI up-scaling on the second image through an up-scaling NN that is set with the selected first NN setting information;
• change pixel values of pixels in the third image, based on the artifact information;
• and
• provide the third image of which the pixel values are changed, to the display,
• wherein the first image is obtained through a down-scaling NN configured with selected second NN setting information from among a plurality of second NN setting information for the AI down-scaling, and
• wherein the plurality of first NN setting information and the plurality of second NN setting information are obtained through joint training of the down-scaling NN and the up-scaling NN.