Electronic device and method with image resoultion increase

A processor-implemented method comprising:

• determining a first spectrum comprising a plurality of frequency components for an image containing noise determined at each of a plurality of levels by transforming the image into a frequency domain at the plurality of levels;
• determining a plurality of tokens for a plurality of patches by segmenting the first spectrum into the plurality of patches and encoding the plurality of patches based on positions of corresponding patches;
• denoising the plurality of tokens based on the image;
• determining a second spectrum obtained by denoising the first spectrum, based on the plurality of denoised tokens;
• and
• generating a high-resolution (HR) image with an increased resolution of the image by inversely transforming the second spectrum into a spatial domain at the plurality of levels.

A processor-implemented method comprising:

• generating, using a wavelet transform, a low-frequency component and a high-frequency component of an image;
• performing, based on a low-resolution (LR) image, denoising on tokens respectively corresponding to the low-frequency component and the high-frequency component;
• generating, based on the denoised tokens, a low-frequency component and a high-frequency component of a high-resolution (HR) image;
• and
• generating, using an inverse wavelet transform, the HR image based on the low-frequency component and the high-frequency component of the HR image.