ISO 20462-1:2005

Defines the units by which image quality is quantified (just noticeabledifferences, or JNDs); describes the influence of stimulus properties,observer characteristics, and task instructions on results obtainedfrom rating experiments; and provides a flow chart for choosing thepreferred psychophysical method for determining image quality fromamong those defined in subsequent parts of ISO 20462.

ISO 20462-2:2005

Defines a standard psychophysical experimental method for subjectiveimage quality assessment of soft copy and hard copy still pictureimages.

ISO 20462-3:2005

Specifies: the nature of a quality ruler; hardcopy and softcopyimplementations of quality rulers; how quality rulers may be generatedor obtained; and the standard quality scale (SQS), a fixed numericalscale that may be measured using quality rulers.

SO 20462-2 測試圖片

你覺得以下三張圖片那一張質素最好？那一張質素最差？
Free ISO 20462-2 test image from International Image Industry Association