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arXiv 2603.03073eess.IV
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上下文自适应扩展链编码用于语义地图压缩

Context Adaptive Extended Chain Coding for Semantic Map Compression

Simon Fraser University(西蒙菲莎大学);University of Science and Technology of China(中国科学技术大学);InterDigital

Runyu Yang, Junqi Liao, Hyomin Choi, Fabien Racapé, Ivan V. Bajić

AI总结:

本文提出一种基于链编码的语义地图无损压缩方法,通过扩展链码和上下文自适应熵编码实现高效压缩,实验表明在比特率和运行时间上均有显著提升。

摘要:

语义地图在机器人、自主系统和扩展现实等领域得到广泛应用,推动了高效压缩方法的研究。本文提出一种基于链编码的新型框架,通过显式利用相邻语义区域的轮廓拓扑和共享边界进行无损压缩。我们提出扩展链码(ECC)以更紧凑地表示长距离轮廓过渡,同时保留传统三正交链码(3OT)作为后备模式以提高效率。为高效编码ECC符号序列,采用基于马尔可夫建模的上下文自适应熵编码方案。此外,引入跳码机制以消除相邻语义区域共享轮廓的冗余表示,通过运行长度信号支持完整和部分跳过。实验结果表明,所提方法在语义地图数据集上平均比特率降低18%,且相对于现代通用无损编码器,编码器和解码器的运行时间分别减少98%和50%。在占用地图上的扩展评估进一步证实了在大多数测试场景中的一致压缩增益。源代码已公开在https://github.com/InterDigitalInc/LosslessSegmentationMapCompression。

英文摘要:

Semantic maps are increasingly utilized in areas such as robotics, autonomous systems, and extended reality, motivating the investigation of efficient compression methods that preserve structured semantic information. This paper studies lossless compression of semantic maps through a novel chain-coding-based framework that explicitly exploits contour topology and shared boundaries between adjacent semantic regions. We propose an extended chain code (ECC) to represent long-range contour transitions more compactly, while retaining a legacy three-orthogonal chain code (3OT) as a fallback mode for further efficiency. To efficiently encode sequences of ECC symbols, a context-adaptive entropy coding scheme based on Markov modeling is employed. Furthermore, a skip-coding mechanism is introduced to eliminate redundant representations of shared contours between adjacent semantic regions, supporting both complete and partial skips via run-length signaling. Experimental results demonstrate that the proposed method achieves an average bitrate reduction of 18\% compared with a state-of-the-art benchmark on semantic map datasets. In addition, the proposed encoder and decoder achieve up to 98\% and 50\% runtime reduction, respectively, relative to a modern generic lossless codec. Extended evaluations on occupancy maps further confirm consistent compression gains across the majority of tested scenarios. The source code is made publicly available at https://github.com/InterDigitalInc/LosslessSegmentationMapCompression.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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