Portable terminal having function of measuring mental fatigue, method for measuring same and server computer

摘要

A portable terminal device capable of measuring and evaluating mental fatigue, its measuring method, and a server computer is provided. The portable terminal device includes an operation unit; an imaging unit; a display screen or light emitting element; and a recording unit. Environmental data, which represents ambient environmental light, is calculated by capturing at least a reference image, first frequency data measured when the user is healthy is associated with first environmental data at the time of the measurement, and the associated data is stored in the recording unit; and a proportion of decrease of second frequency data measured when the user is not healthy from the first frequency data associated with the first environmental data having the same order of magnitude as that of second environmental data at the time of the measurement is calculated to evaluate the degree of fatigue of the user.

主权项

1. A portable terminal device capable of measuring mental fatigue comprising:
a processor configured to calculate a first frequency data and a second frequency data; an operation unit; an imaging unit configured to measure ambient light, the imaging unit comprising a CCD or CMOS sensor and a lens; a display screen configured to display a blinking image while a flicker frequency of the blinking image is being monotonically changed with time from a start frequency to an ending frequency; and a memory configured to record the flicker frequency, as a measurement frequency, at the time when a user operates the operation unit to indicate that the user perceives flicker during the display of the blinking image, wherein: the first frequency data is associated with first environmental data, which represents the ambient light measured by the imaging unit, the first frequency data being the measurement frequency measured when the user is specified as being healthy via the operation unit, and an associated data of the first frequency data and the first environmental data is stored in the memory; and a proportion of decrease of the second frequency data from the first frequency data, the first frequency data being associated with the first environmental data, the first environmental data having the same order of magnitude as that of second environmental data, the proportion of decrease of the second frequency is calculated to evaluate a degree of fatigue of the user, the second frequency data being the measurement frequency measured when the user is not specified as being healthy via the operation unit, the second environmental data being the ambient light measured by the imaging unit, and the degree of fatigue is displayed on the display screen, wherein: each of the first and second environmental data is a value calculated by
first environmental data=K×Sn/SS, andsecond environmental data=K×Sn/SS, using image luminance data SS obtained by capturing a reference image at a position having a reference illuminance of K; and image luminance data Sn obtained by the imaging unit capturing the reference image at a position having an arbitrary illuminance, and wherein the processor uses the reference illuminance of K to correct the image luminance data Sn.