海尔-波普彗星近核区图像增强方法及比较

Enhance Comet Processing of Hale-Bopp's Near Nucleus Images and Comparison of Several Processing Methods

该文以Z .Sekanina等的方法和小波处理方法分别对 1997年 3月 3～ 5日在紫金山天文台行星室观测得到的海尔 -波普彗星的近核现象CCD图像加以增强处理和分析比较 ,明显地从CCD图像还原出壳层 (Shell)和喷流 (jet)结构 ,结果表明小波处理方法比Z .Sekanina等的方法在小视场图像处理中效果更佳。

Several methods of computer processing were used to enhance comet's near nucleus images. S.M.Larson and Z.Sekanina have put forward their method to enhance jets and shells of comet Hallay. In recent years, wavelet analysis method was also used in the processing of comet's images. By these methods, comet's near nucleus phenomena, such as jets and shells, can be displayed clearly. We used these methods to enhance the CCD images of comet Hale-Bopp which were taken by 40cm telescope of Purple Mountain Observatory. From these images of the comet on March 3rd and 4th, two shells and jets on northeast of the nucleus can be seen more clearly. It seems that results by the wavelet analysis are better than those by Z.Sakenina's method in smaller field.