Abstract

Trit-plane coding enables deep progressive image compression, but it cannot use autoregressive context models. In this paper, we propose the context-based trit-plane coding (CTC) algorithm to achieve progressive compression more compactly. First, we develop the context-based rate reduction module to estimate trit probabilities of latent elements accurately and thus encode the trit-planes compactly. Second, we develop the context-based distortion reduction module to refine partial latent tensors from the trit-planes and improve the reconstructed image quality. Third, we propose a retraining scheme for the decoder to attain better rate-distortion tradeoffs. Extensive experiments show that CTC outperforms the baseline trit-plane codec significantly, e.g. by -14.84% in BD-rate on the Kodak lossless dataset, while increasing the time complexity only marginally.

Overview

Publication

Seungmin Jeon, Kwang Pyo Choi, Youngo Park and Chang-Su Kim, "Context-based Trit-Plane Coding for Progressive Image Compression," accepted to Proceedings of IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2023.
[pdf] [code] [supplementary] [arXiv]