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Application And Comparison Of Edge Detectors In Center Measurement Of Jupiter

Posted on:2008-07-17Degree:MasterType:Thesis
Country:ChinaCandidate:W R GuFull Text:PDF
GTID:2120360215495649Subject:Computer software and theory
Abstract/Summary:PDF Full Text Request
The positional observation and measurement of our solar system' planets andtheir satellites always has important meaning. The main purpose of the positionalobservation is to improve the orbit theory of the planets and their satellites for thesolar system space exploration.Edge detection is important in observing the Jupiter's position. Peng et al. putforward an algorithm based on a threshold. They applied this algorithm to detectJupiter's position and gained a good precision. But while facing many images withdifferent exposure times, it needs a great deal of experiment to find suitable thresholds.In order to solve this problem, based on Peng et al.'s research, this paper uses severalfamiliar differential algorithms to detect Jupiter's edge, such as the LOG algorithm,Prewitt algorithm, Sobel algorithm, etc. Moreover, we apply a new method of preciseestimation, that is, detecting the distance of the Jupiter's center and its satellites, andthen using the relationship of these data and the time of these astronomic images toevaluate the precision of edge detection algorithms. We also gain major axes in ellipsefitting by using Jupiter's edge, and then apply the major axes to evaluate indirectly thedetection.The result shows that two-kind edge detections based on either a threshold ordifferential algorithms have a good precision. Besides, the edge detection based on athreshold can provide a good reference edge for differential edge detections. But theedge detection based on a threshold relies on experiential thresholding, while thedifferential coefficient algorithms have better stability (better external precision).
Keywords/Search Tags:Edge Detection, Planet Centering, Astronomic Image
PDF Full Text Request
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