Method, apparatus and storage medium for image encoding/decoding

An image coding method, comprising:

• generating a bitstream including information about multiple scaled versions of an image;
• and
• storing the bitstream, wherein
• the bitstream is generated by a neural network-based image compression network that supports arbitrary scale spatial scalability, wherein
• in the neural network-based image compression network, a number of multiple layers and respective scale factors of the multiple layers are arbitrarily determined during inference,
• the multiple layers comprise a base layer and one or more enhancement layers,
• a shared sub-network is used for each of the one or more enhancement layers, and
• the shared sub-network comprises an inter-layer arbitrary scale prediction module and a residual compression module.

An image coding method, comprising:

• obtaining a bitstream;
• and
• performing decoding on an image using information about multiple scaled versions of the image in the bitstream, wherein
• the bitstream is processed by a neural network-based image compression network that supports arbitrary-scale spatial scalability, and
• the neural network-based image compression network uses an inter-layer arbitrary scale prediction method based on implicit neural representation.