摘要
在分析扫描法和矢量法的基础上,提出了块扫描法。首先,根据星像扩散范围和导航星间距确定扫描块的大小;其次,以扫描块为单位,获得其最大灰度值像素,若灰度大于设定背景阈值,则存储其位置信息与灰度值;再次,以存储像素为中心搜索3×3像素阵,若存在像素灰度值大于存储像素,则剔除存储像素;否则,判断像素阵中灰度大于背景阈值的像素个数是否大于设定星像门限阈值,若大于,则认为该像素阵为星像,该点为星像中心。对该方法进行了仿真,结果证明:该方法提取星像精度较高。
Blocks scanning is proposed based on the thoughts of the scanning technique and the vector technique.The block-square is determined based on the defocus and the distance between the stars.In every block,the pixel with highest grayvalue is found and the position is stored.The stored pixels will be eliminated if the surrounded pixels have higher grayvalue or the number of the pixels with grayvalue higher than the grayvalue threshold is lower than the number threshold.The left is the center of the stars in the image.Simulation result proves the validity of the method.
出处
《传感器与微系统》
CSCD
北大核心
2011年第4期17-18,共2页
Transducer and Microsystem Technologies
关键词
星敏感器
星提取
阈值
扫描法
star sensor
star extraction
threshold value
scanning
