提出块调制成像技术,实现卫星上超低复杂度遥感图像压缩。
Ultra-Low Complexity On-Orbit Compression for Remote Sensing Imagery via Block Modulated Imaging
- 通过单次曝光块调制成像,大幅提升成像速度。
- 无需数字微镜器件,支持高分辨率重建,压缩率优于传统方法。
- 专为卫星设计的解码网络,适合资源受限的在轨应用。
遥感领域面临影像数据量持续增长,超出卫星平台存储与传输能力的挑战。高效压缩是缓解此压力的关键。现有压缩方法常因计算开销过大而不适用于卫星。得益于压缩感知理论的发展,单像素成像为在轨图像压缩带来新可能,但存在成像时间长、难以实现高分辨率的问题。本文提出块调制成像(BMI)方法,仅需一次曝光即可显著提升采集速度,且无需数字微镜器件,突破了分辨率限制。同时,设计了一种针对BMI框架的新型解码网络,采用门控3D卷积和双向跨注意力模块,有效促进多阶段信息流动,提升重建性能。在多个知名遥感数据集上的实验验证了方法的有效性。进一步开发并测试了基于BMI的相机原型,展现出在轨压缩的实用潜力。代码已开源:https://github.com/Johnathan218/BMNet。
原文摘要 · Abstract (English)
The growing field of remote sensing faces a challenge: the ever-increasing size and volume of imagery data are exceeding the storage and transmission capabilities of satellite platforms. Efficient compression of remote sensing imagery is a critical solution to alleviate these burdens on satellites. However, existing compression methods are often too computationally expensive for satellites. With the continued advancement of compressed sensing theory, single-pixel imaging emerges as a powerful tool that brings new possibilities for on-orbit image compression. However, it still suffers from prolonged imaging times and the inability to perform high-resolution imaging, hindering its practical application. This paper advances the study of compressed sensing in remote sensing image compression, proposing Block Modulated Imaging (BMI). By requiring only a single exposure, BMI significantly enhances imaging acquisition speeds. Additionally, BMI obviates the need for digital micromirror devices and surpasses limitations in image resolution. Furthermore, we propose a novel decoding network specifically designed to reconstruct images compressed under the BMI framework. Leveraging the gated 3D convolutions and promoting efficient information flow across stages through a Two-Way Cross-Attention module, our decoding network exhibits demonstrably superior reconstruction performance. Extensive experiments conducted on multiple renowned remote sensing datasets unequivocally demonstrate the efficacy of our proposed method. To further validate its practical applicability, we developed and tested a prototype of the BMI-based camera, which has shown promising potential for on-orbit image compression. The code is available at https://github.com/Johnathan218/BMNet.
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