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Error rate of automated calculation for wound surface area using a digital photography

 S Yang  ;  J Park  ;  H Lee  ;  J B Lee  ;  B U Lee  ;  B H Oh 
 Skin Research and Technology, Vol.24(1) : 117-122, 2018 
Journal Title
 Skin Research and Technology 
Issue Date
image analysis ; photography ; smartphone ; wounds and Injuries
BACKGROUND: Although measuring would size using digital photography is a quick and simple method to evaluate the skin wound, the possible compatibility of it has not been fully validated. PURPOSE: To investigate the error rate of our newly developed wound surface area calculation using digital photography. METHODS: Using a smartphone and a digital single lens reflex (DSLR) camera, four photographs of various sized wounds (diameter: 0.5-3.5 cm) were taken from the facial skin model in company with color patches. The quantitative values of wound areas were automatically calculated. The relative error (RE) of this method with regard to wound sizes and types of camera was analyzed. RESULTS: RE of individual calculated area was from 0.0329% (DSLR, diameter 1.0 cm) to 23.7166% (smartphone, diameter 2.0 cm). In spite of the correction of lens curvature, smartphone has significantly higher error rate than DSLR camera (3.9431+/-2.9772 vs 8.1303+/-4.8236). However, in cases of wound diameter below than 3 cm, REs of average values of four photographs were below than 5%. In addition, there was no difference in the average value of wound area taken by smartphone and DSLR camera in those cases. CONCLUSION: For the follow-up of small skin defect (diameter: <3 cm), our newly developed automated wound area calculation method is able to be applied to the plenty of photographs, and the average values of them are a relatively useful index of wound healing with acceptable error rate.
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1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Dept. of Dermatology (피부과학교실)
Yonsei Authors
오병호(Oh, Byung Ho) ORCID logo https://orcid.org/0000-0001-9575-5665
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