Based on the similarities between star and small target,a new method of star extraction from star image comprised of high pass filter and dynamic threshold was proposed to deal with the star acquisition. The star image was filtered by the high pass filter with a threshold fixed before-hand to obtain possible star pixels. Owing to the abundance of illusive objects, the possible star pixels were acquired by using dynamic threshold. The simulation results illustrate that the vector technique and our algorithm have same precision with the absence of noise. Once noise is added onto star image, the precision of proposed method is much higher than that of the vector technique, while the processing efficiency of them remains the same. Thus the proposed method has strong anti-noise ability.
JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE
high pass filter