DIRECT: Discrete Image Rescaling with Enhancement from Case-specific Textures

This paper addresses image rescaling, the task of which is to downscale an input image followed by upscaling for the purposes of transmission, storage, or playback on heterogeneous devices. The state-of-the-art image rescaling network (known as IRN) tackles image downscaling and upscaling as mutually invertible tasks using invertible affine coupling layers. In particular, for upscaling, IRN models...