Event camera high-precision calibration method and system for space situation awareness

By using a calibration framework of a stellar simulator and a high-precision turntable in event camera calibration, the calibration trajectory is dynamically collected and the position of the sub-pixel centroid is determined, which solves the problem of insufficient calibration accuracy of event cameras in the prior art, and achieves high-precision spatial situational awareness.

CN119672128AActive Publication Date: 2025-03-21BEIHANG UNIV
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Patent Information

Application Number
CN202411727919.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-28
Publication Date
2025-03-21
Estimated Expiration
2044-11-28

AI Technical Summary

Technical Problem

There is a gap between the accuracy of the existing event camera calibration method and the performance requirements of traditional space-based visible light sensors in space situational awareness, and it is difficult to meet the rapid and accurate monitoring of space targets by event cameras in space situational awareness.

Method used

Using a calibrating framework of a stellar simulator and a high-precision rotary table, the dynamic calibration trajectory acquisition strategy is used to determine the sub-pixel centroid position of the calibration point in three steps, and the internal and external parameters of the event camera are optimized based on the one-to-one correspondence between the calibration point and the angle of the turntable.

Benefits of technology

High-precision calibration of event cameras is achieved, and the calibration accuracy is comparable to that of traditional cameras, and it is greatly improved compared with the current event camera calibration method, which can meet the requirements of spatial target detection accuracy.

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Abstract

The invention discloses an event camera high-precision calibration method for space situation awareness. The event camera high-precision calibration method comprises the following steps: establishing a combined calibration frame of a fixed star simulator, a high-precision turntable and an event camera; controlling the high-precision turntable to rotate, collecting event flow information generated by the relative motion point light source, and obtaining a gray value of the latticed track image; extracting a connected domain, counting crossed overlapped pixels and pixel overlapped areas in the horizontal direction and the vertical direction, and calculating a coarse centroid position; determining a space window and a time window, determining a centroid position based on a time interpolation gray centroid positioning algorithm, and performing linear fitting on the centroid position to determine a trajectory equation; calculating coarse centroid positions of all cross points and a trajectory equation of each space window, and calculating a sub-pixel centroid position based on the vertical trajectory equation; and the internal and external parameters of the event camera are optimally solved based on the corresponding relation between the sub-pixel centroid position and the rotary table angle. The invention further discloses a corresponding system, electronic equipment and a computer readable storage medium.
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