ISO 21227-1:2003给出了光学成像系统的定义，并提供了使用光学成像系统定量表征涂层表面缺陷的指南，这些缺陷在各种试验方法（如石片、风化或横切试验）中暴露后出现。ISO 21227的一个目标是使用光学成像再现现有视觉评估方法的结果。此外，光学成像提供了更多信息，可用于更详细的涂层缺陷评估。 ISO 21227的本部分包含光学成像方法和定义的一般介绍。本标准的其他部分描述了各试验方法的性能和精度要求。

ISO 21227-1:2003 gives definitions for and provides guidance in the use of optical imaging systems for the quantitative characterization of defects on coated surfaces that occur after exposure in various test methods, e.g. stone chipping, weathering or cross-cut testing. One aim of ISO 21227 is to use optical imaging to reproduce the results of already existing methods for visual assessment. Additionally, optical imaging provides further information which can be used for a more detailed evaluation of coating defects. This part of ISO 21227 contains a general introduction in optical-imaging methods and definitions. The performance of individual test methods and requirements for precision are described in other parts of the standard.