“…Different from ordinary image restoration works that directly reconstructs an image from its degraded version, invertible image restoration aims to embed significant information into the degraded image to aid the process of restoration. Invertible grayscaling [9,27] proposes a encoder-decoder framework to embed the original color information into a synthesized grayscale image which is further used to recover its corresponding color image. Zhu et al [36] embeds the spatio-temporal information of a video into a "live" image, which can be converted back to a video preview.…”