Human monitoring system incorporating calibration methodology
AssigneeFotoNation Limited
InventorsFlorin NANU, Stefan PETRESCU, Florin OPREA, Emanuela HALLER
Life of this patent
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Abstract
Method for monitoring eyelid opening values. In one embodiment video image data is acquired with a camera which data are representative of a person engaged in an activity, where the activity may be driving a vehicle, operating industrial equipment, or performing a monitoring or control function. When the person's head undergoes a change in yaw angle, such that eyelids of both eyes of the person are captured with the camera, but one eye is closer to the camera than the other eye, a weighting factor is applied, which factor varies as a function of the yaw angle such that a value representative of eyelid opening data based on both eyes is calculated.
Claims7
A method for monitoring eyelid opening values by acquiring video image data with a camera which data are representative of a person engaged in an activity, where the activity may be driving a vehicle, operating industrial equipment, or performing a monitoring or control function, comprising:
- when the person's head undergoes a change in yaw angle, such that eyelids of both eyes of the person are captured with the camera, but one eye is closer to the camera than the other eye, applying a weighting factor which varies as a function of the yaw angle such that a value representative of eyelid opening data based on both eyes is calculated as:
- w(LEOD)+(1−w)(REOD), where:
- LEOD is the measured left eyelid opening distance and REOD is the measured right eyelid opening distance;
- and
- where the weight, w, varies from zero to one and changes proportionally to the change in head yaw angle.
Dependencies are inferred from the claim text.