首页|A star identification algorithm for rolling shutter exposure based on Hough transform
A star identification algorithm for rolling shutter exposure based on Hough transform
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The star identification algorithm usually identifies stars by angular distance matching.However,under high dynamic conditions,the rolling shutter effect distorts the angular distances between the measured and true star positions,leading to plethoric false matches and requiring com-plex and time-consuming verification for star identification.Low identification rate hinders the application of low-noise and cost-effective rolling shutter image sensors.In this work,we first study a rolling shutter distortion model of angular distances between stars,and then propose a novel three-stage star identification algorithm to identify distorted star images captured by the rolling shutter star sensor.The first stage uses a modified grid algorithm with adaptive error tolerance and an expanded pattern database to efficiently eliminate spurious matches.The second stage per-forms angular velocity estimation based on Hough transform to verify the matches that follow the same distortion pattern.The third stage applies a rolling shutter error correction method for further verification.Both the simulation and night sky image test demonstrate the effectiveness and effi-ciency of our algorithm under high dynamic conditions.The accuracy of angular velocity estimation method by Hough transform is evaluated and the root mean square error is below 0.5(°)/s.Our algorithm achieves a 95.7％identification rate at an angular velocity of 10(°)/s,which is much higher than traditional algorithms.
Star trackersStar identificationRolling shutterAngular velocity estimationHough transform
Tao WANG、Gangyi WANG、Xinguo WEI、Yongyong LI
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School of Instrumentation and Optoelectronic Engineering,Beihang University,Beijing 100191,China
National Key Research and Development Program of China
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