PD ISO/TS 20498-4:2020

What is ISO 20498-4 about?  

ISO 20498-4 is the fourth part of the ISO 20498 series which discusses the use of traditional Chinese medicine. ISO 20498-4 specifies the performance criteria of peripheral visual instruments in the computerized tongue image analysis system (CTIS), including colour reproduction, distortion and resolution. 

Who is ISO 20498-4 for? 

ISO 20498-4 on CTIS is useful to: 

• Manufacturers of Chinese medicine 
• Companies dealing with image analyzing systems 
• Retailers and suppliers of medicine 

Why should you use ISO 20498-4 for? 

Tongue diagnosis in Chinese medicine is a method through which diseases and disease patterns can be diagnosed by visual inspection of the tongue and its various features. 

ISO 20498-4 specifies the performance of other visual instruments for CTIS such as:  

• Colour reproduction, which has the ability to accurately reproduce the colour of the object 
• Display resolution, which contains a number of distinct pixels displayed in each dimension 
• Distortion, which deforms the shape of the image 

As a user of ISO 20498-4, adopting the best industry guidance on performance criteria of instruments can enhance the quality and consistency of tongue images and reduce variations between diagnoses through computerized tongue image analysis.