本文前半部概括地叙述了多次复盖技术的发展情况,并且简要地讨论了应用多次复盖时应注意的一些问题。后半部叙述了一些数字处理方法,诸如最佳多次复盖,统计方法的应用等,本文只是一般性的描述,凡涉及到的专门技术问题,均可在有关文献中查得。 The first half of this article provides an overview of the development of multiple overlay techniques and briefly discusses some of the issues that should be noted when applying multiple overlays. The second half describes some of the digital processing methods, such as the best multiple cover, the application of statistical methods, this article is only a general description, where the technical issues involved, can be found in the literature.