Learning Lossless Compression for High Bit-Depth Volumetric Medical Image

TL;DR

This paper introduces BD-LVIC, a novel lossless compression framework for high bit-depth volumetric medical images, combining bit-division, traditional codecs, and a Transformer-based model to improve efficiency and maintain speed.

Contribution

The paper proposes a new bit-division based framework that effectively compresses high bit-depth medical volumes using a hybrid approach with traditional codecs and a Transformer-based learning model.

Findings

Sets new performance benchmarks on multiple datasets

Maintains competitive coding speed

Effectively captures structural and texture details

Abstract

Recent advances in learning-based methods have markedly enhanced the capabilities of image compression. However, these methods struggle with high bit-depth volumetric medical images, facing issues such as degraded performance, increased memory demand, and reduced processing speed. To address these challenges, this paper presents the Bit-Division based Lossless Volumetric Image Compression (BD-LVIC) framework, which is tailored for high bit-depth medical volume compression. The BD-LVIC framework skillfully divides the high bit-depth volume into two lower bit-depth segments: the Most Significant Bit-Volume (MSBV) and the Least Significant Bit-Volume (LSBV). The MSBV concentrates on the most significant bits of the volumetric medical image, capturing vital structural details in a compact manner. This reduction in complexity greatly improves compression efficiency using traditional codecs. Conversely, the LSBV deals with the least significant bits, which encapsulate intricate texture details. To compress this detailed information effectively, we introduce an effective learning-based compression model equipped with a Transformer-Based Feature Alignment Module, which exploits both intra-slice and inter-slice redundancies to accurately align features. Subsequently, a Parallel Autoregressive Coding Module merges these features to precisely estimate the probability distribution of the least significant bit-planes. Our extensive testing demonstrates that the BD-LVIC framework not only sets new performance benchmarks across various datasets but also maintains a competitive coding speed, highlighting its significant potential and practical utility in the realm of volumetric medical image compression.