ISO/IEC 29170-2:2015规范了用于显示器和显示系统的灯光编码系统的评估和分级，但与显示技术无关。该程序测量观察者是否能够在预先确定的、具有统计意义的水平上区分未压缩参考和重建图像。 该程序将单个图像与两种可能的强制选择比较测试方法进行比较。该程序依赖于主观评估方法，旨在识别任何技术或尺寸的电子彩色显示器上的图像缺陷。

ISO/IEC 29170-2:2015 normalizes evaluation and grading of a light coding system used for displays and display systems, but is independent of the display technology. This procedure measures whether an observer can distinguish between an uncompressed reference and the reconstructed image to a pre-determined, statistically meaningful level. The procedure compares individual images with two possible forced choice comparison test methods. This procedure relies on subjective evaluation methods designed to discern image imperfections on electronic colour displays of any technology or size.