Visual Field Measurement Method for protective eyeglasses based on Computer Vision
ZHAO Min1,LIU Dan1,LI Yi2,QIAO Wei-dong1
1. School of Mechanical & Precision Instr Eng, Xi‘an University of Technology, Xi‘an, Shaanxi 710048, China
2. Optical Metrology and Test Center, Shaanxi Institute of Metrology Science, Xi’an, Shaanxi 710065, China
Abstract：In view of the singularity and inefficiency of visual field measurement for protective eyeglasses at present, a visual field measurement method for protective eyeglasses based on computer vision is proposed, and an experimental measurement system is established. A standard head model and two fiber light sources are used to simulate the visual field when the eyes look straight ahead. By comparing the changes of the projection area before and after wearing eyeglasses, the qualification of the visual field of the eyeglasses can be determined quickly. The projection image of the measured eyeglasses is analyzed, then the outline information of the eyeglasses is clustered and extracted. The visual field is calculated according to the angle relationship between the pupil and the eyeglasses. The experimental results show that the method has the characteristics of high efficiency and intelligence compared with traditional methods. It only takes 10 second to determine qualification of the visual field of an eyeglasses. The error analysis of the measurement system is carried out and the final extended uncertainty is U=0.8(k=2). The system meet the practical demand of the visual field detection of protective eyeglasses.
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2019, Vol. 40 
