ISO 20462-1:2005是关于图像静态图像质量主观评估的三部分标准的一部分。ISO 20462-1:2005定义了量化图像质量的单位（只是明显的差异，或JND）；描述刺激属性、观察者特征和任务指令对评级实验结果的影响；并提供了一个流程图，用于从ISO 20462后续部分定义的方法中选择用于确定图像质量的首选心理物理方法。

ISO 20462-1:2005 is part of a three-part standard pertaining to the subjective evaluation of pictorial still image quality. ISO 20462-1:2005 defines the units by which image quality is quantified (just noticeable differences, or JNDs); describes the influence of stimulus properties, observer characteristics, and task instructions on results obtained from rating experiments; and provides a flow chart for choosing the preferred psychophysical method for determining image quality from among those defined in subsequent parts of ISO 20462.