CAJ | 학술논문

分析了近红外星图小波分解系数的特点。依据小波分析的边缘检测特性、解相关性和多分辨率特性结合星点的灰度分布特征设计了不同尺度下的检测模板。在恒虚警概率条件下，提出利用局部阈值克服红外星图本身的背景不均匀性。通过在星图第二次分解的近似系数上检测星点最大灰度值的位置，削弱了单点噪声和条纹噪声的影响。实验结果显示，算法能有效得出视场中的星点最大灰度值坐标，误差在1个像素位置左右，满足后续星点提取的需要。
분석료근홍외성도소파분해계수적특점。의거소파분석적변연검측특성、해상관성화다분변솔특성결합성점적회도분포특정설계료불동척도하적검측모판。재항허경개솔조건하，제출이용국부역치극복홍외성도본신적배경불균균성。통과재성도제이차분해적근사계수상검측성점최대회도치적위치，삭약료단점조성화조문조성적영향。실험결과현시，산법능유효득출시장중적성점최대회도치좌표，오차재1개상소위치좌우，만족후속성점제취적수요。
The distillation of near-infrared star image of star tracker was analyzed in this paper. A new method for this problem was presented. Firstly, characters of near-infrared star image in wavelet domain were analyzed and mask used to detect stars in multi scales were designed according to the distribution of the gray of stars. Then, local threshold was applied to overcome the imbalance of the background under the constant false alarm rate. Lastly, positions of the heaviest gray values of stars in the secondly decomposed approximation coefficients were accessed, eliminating the effect of the single point noise and stripe noise. Experimental results indicate that the method could efficiently obtain the position of the heaviest gray value of detected stars with error around one pixel, which satisfies the requirement of estimation of centroid.