航天器对小行星抵近探测过程中的视频超分辨方法

    Video Super-resolution Method for Spacecraft Approaching and Detecting Asteroids

    • 针对抵近探测中平台运动、抖动导致的动态图像序列模糊及分辨率低的问题, 提出了一种基于BasicVSR++的视频超分辨方法. 通过引入空间和通道注意力机制强化细节特征提取, 结合共享投射权重、多组机制和采样点调制优化对齐模块, 弥补正则卷积在长距离依赖与自适应空间聚集的不足. 采用下采样与低通滤波器结合的方式, 减少高频成分, 提升抗图像抖动鲁棒性, 同时引入新上采样模块, 通过融合局部与全局特征生成自适应上采样核, 进一步扩展感受野, 以更好地恢复全局结构并重建细节. 仿真实验结果显示, 本文提出的方法在峰值信噪比(PSNR)和结构相似性(SSIM)指标上, 分别比原始方法提高了2.2%和2.1%, 验证了本文方法在抵近探测图像序列超分辨率重建质量提升方面的有效性.

       

      Abstract: In the imaging process of approach detection, dynamic image sequences often have problems such as image blur and insufficient resolution due to platform movement and jitter. This paper studies the super-resolution of image sequences in the process of approach detection and proposes a video super-resolution method based on BasicVSR++. By introducing spatial and channel attention mechanisms to enhance the model’s ability to extract detail features, combined with shared projection weights, multi-group mechanisms and sampling point modulation, the effect of the alignment module is improved. While improving the network feature extraction capability, it makes up for the shortcomings of regular convolution in long-distance dependency and adaptive spatial aggregation. At the same time, downsampling is combined with a low-pass filter to reduce the high-frequency components of the image, which improves the robustness of the model to slight image jitter. In addition, a new upsampling module is introduced to combine local and global features, generate an adaptive upsampling kernel to expand the receptive field, and better restore the global structure and reconstruct details. The simulation experimental results show that the proposed method improves the Peak Signal-to-Noise Ratio (PSNR) and Structural Similarity (SSIM) indicators by 2.2% and 2.1% respectively compared with the original method, which proves the effectiveness of the method proposed in this paper in improving the quality super-resolution reconstruction of the image sequence in close proximity.

       

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