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KMID : 1144120150050010029
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Biomedical Engineering Letters
2015 Volume.5 No. 1 p.29 ~ p.32
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Measurement of pupillary light reflex features through RGB-HSV color mapping
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Moon Seong-Yong
Lee Jeong-Pyo
Bae Jin-Ho
Lee Tae-Soo
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Abstract
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Purpose: The pupillary light reflex (PLR) test is the method of examining the immediate reaction of the pupil by light stimuli, and the dysfunctions in autonomic nervous system can be evaluated quickly and easily through this method. This study addressed a new method of measuring pupillary light reflex features.
Methods: The proposed system in this study utilizes the flash LED of a smartphone to provide light stimuli to the patient’s pupil, and the resulting reactions are recorded as images and videos to be analyzed using smartphone app and MATLAB. Results In case of video recording, the user can turn the flash on and off at the desired moment and data acquisition time was set to be 6 seconds. For the image mode, the system was designed to acquire one image prior to light stimulation and 4 images after light stimulation, so that temporal changes in pupil can be compared. As such, image was processed in a way of changing RGB channel to HSV channel through MATLAB program so that pupil of photographed image could be recognized without difficulty.
Conclusions: The system developed in this study utilizes smartphones so that anyone can easily utilize the tool conveniently without restrictions of time and location. Further, other strengths include the fact that light stimulation can be provided using the flash function built within the smartphones, as well as the fact that patient data could be saved and managed easily, and shared using the email transmission function.
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KEYWORD
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Pupillary light reflex, Smartphone, Color mapping, MATLAB
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