基于物方一致性的珞珈三号01星视频数据在轨实时稳像  

Object-Space-Consistency-Based Real-Time Stabilization Approach for Luojia3-01 Video Data

作　　者：张致齐 王密[2] 曹金山 刘闯 廖敦波 ZHANG Zhiqi;WANG Mi;CAO Jinshan;LIU Chuang;LIAO Dunbo(School of Computer Science,Hubei University of Technology,Wuhan 430068,China;State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,China;Wuhan Huadi Dimension Technology,Wuhan 430074,China)

机构地区：[1]湖北工业大学计算机学院,湖北武汉430068 [2]武汉大学测绘遥感信息工程国家重点实验室,湖北武汉430079 [3]武汉华迪维度科技有限公司,湖北武汉430074

出　　处：《武汉大学学报（信息科学版）》2024年第6期899-910,共12页Geomatics and Information Science of Wuhan University

基　　金：国家重点研发计划(2022YFB3902800);国家自然科学基金(61901307);湖北省面上项目(2022CFB352)。

摘　　要：利用高分辨率敏捷光学卫星的凝视观测能力,对特定区域或目标进行连续观测,从而实现区域监测、目标跟踪等应用,是高分辨率光学卫星的应用热点之一。获取的凝视观测数据经过几何与稳像处理后,能得到稳定的高质量视频数据。但受制于过程中需要的大量运算,星载设备计算与存储能力难以满足,该处理只能由地面系统在事后完成,信息获取的时效性低。针对该问题,基于珞珈三号01星数据特点与星载硬件计算能力,提出一种基于物方一致性的在轨视频帧实时稳像方法。所提方法利用实时几何定位,在卫星成像过程中实时提取并对目标区域影像进行几何校正;同时利用影像帧之间地理信息的一致性,对相邻影像帧进行实时配准,保证帧间相对精度;在此基础上,通过构建算法并行流水线,实时生成带有地理编码的兴趣区视频帧序列。使用珞珈三号01星真实数据与帧率(6帧/s)进行实验,结果表明,基于珞珈三号01星嵌入式星载处理硬件,所提方法能够实现快于6帧/s的处理速度,同时获得的视频帧序列带有地理编码,且帧间稳像精度达0.328像素,可满足星载实时服务需求。Objectives High-resolution agile optical satellites can continuously observe specific regions or targets,thereby realizing applications such as regional monitoring and target tracking.In order to obtain stable and high-quality video data,continuous observation data need to be geographically corrected and stabilized.This process requires a large amount of calculation,but the on-board computing and storage device cannot meet the demand.Therefore,this process can only be completed afterwards by on-ground system,resulting in a significant delay in information acquisition.Methods This paper proposes an object-space-consistency-based real-time stabilization approach for Luojia3-01 satellite video data,which is based on data characteristics and computing capability of embedded on-board hardware.The proposed approach employs real-time geometric positioning to extract and correct the region of interest(ROI)in real-time during satellite imaging.Additionally,it employs the consistency of geographical information in real-time align adjacent image frames to ensure the relative accuracy between sequence frames.On the basis,it generates a sequence of video frames of ROI with geographical encoding in real-time through the construction of a parallel pipeline of algorithms.Results The experiments are conducted by the actual data of Luojia3-01 satellite with the frame rate of 6 frame per second,and the proposed approach can realize the faster processing based on the embedded on-board processing hardware.Furthermore,the obtained video frame sequence with geographic encoding and the inter-frame stabilized accuracy is better than 0.328 pixels.Conclusions The proposed approach can meet the requirements of on-board real-time service.

关 键 词：视频稳像 兴趣区提取 实时处理 星上处理 

分 类 号：P237[天文地球—摄影测量与遥感]