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JC, another great find
Seems strange that they only mention having a camera on the steering wheel cover rather than a multitude of options
[0054] The inattention time recognition unit 15 recognizes a time duration of eye glance away from road environment (inattention time) which is a time the inattention of the driver continues based on the driver image acquired by the driver image acquisition unit 11, for example. The method of recognizing the inattention time is not particularly limited, and various well-known methods can be adopted.
[0055] The arousal level recognition unit 16 recognizes the arousal level of the driver from the eye closing rate of the driver per minute, an eye open situation, a blinking frequency, or the movement of eyeballs, and the like, based on the driver image acquired by the driver image acquisition unit 11. The arousal level recognition unit 16 may recognize the arousal level of the driver based on the state of the host vehicle recognized by the vehicle state recognition unit 13. The arousal level is a degree indicating that the consciousness of the driver is not in a state of being hazy due to lack of sleep or the like, but in an awakening state. The method of recognizing the arousal level is not particularly limited, and various well-known methods can be adopted.
[0056] The driving readiness degree estimation unit 17 estimates the driving readiness degree based on the reaction time recognized by the reaction time recognition unit 14, the inattention time recognized by the inattention time recognition unit 15, and the arousal level recognized by the arousal level recognition unit 16. The driving readiness degree is a degree according to the height of the driving consciousness of the driver. The driving consciousness is a generic term for mental activities including cognition, prediction, determination, and an operation when the driver drives a vehicle.
[0057] The driving readiness degree is a level of readiness for the driving by the driver. The driving readiness degree is also called “readiness”. As the driving consciousness and the degree of readiness of the driver against the traveling environment of the host vehicle increase, the value of driving readiness degree increases. As an example, the driving readiness degree here can be divided into five stages such as Low (low), Medium Low (slightly low), Medium (normal), Medium High (slightly high) and High (high). The way of expressing the driving readiness degree is not particularly limited, and may be expressed by a numerical value or may be divided into plural stages.
[0007] In the driving consciousness estimation device according to an aspect of the present disclosure, the driving readiness degree estimation unit may be configured to estimate the driving readiness degree based on the width of the field of view and at least one of the time duration of eye glance away from road environment and the arousal level, if the driver is driving the vehicle with manual driving. At the time of manual driving in which it is difficult to appropriately determine the reaction of the driver, it is possible to appropriately estimate the driving readiness degree based on the width of the field of view of the driver.
[0034] A driver monitor camera 1, an external sensor 2, an internal sensor 3, a global positioning system (GPS) receiver 4, a map database 5, and an HMI 6 are connected to the ECU 10. The ECU 10 is connected to an autonomous drive ECU 7.
[0035] The driver monitor camera 1 is provided on a cover of a steering column of the host vehicle and in front of the driver, and images a head of the driver. Since the driver monitor camera 1 images the driver from plural directions, plural number of cameras may be provided. The driver monitor camera 1 transmits a driver image in which the driver is imaged to the ECU 10.
[0052] The reaction time recognition unit 14 recognizes a reaction time (a reaction delay) of the driver. The reaction time includes a peripheral reaction time and a vehicle behavior reaction time. The reaction time recognition unit 14 recognizes the reaction time from the timing when the viewing target is seen by the driver to the timing when the driver visually recognizes the viewing target as the peripheral vision reaction time. The reaction time recognition unit 14 recognizes the reaction time from the timing when the viewing target is seen by the driver to the timing when the driver executes the vehicle behavior against the viewing target as the vehicle behavior reaction time. The method of recognizing the reaction time is not particularly limited, and various well-known methods can be adopted.
[0053] The viewing target can be detected from the traveling environment recognized by the traveling environment recognition unit 12. The viewing target includes at least one of a surrounding vehicle, a road shape, and an installed object on the road. A line of sight of the driver can be detected from the driver image acquired by the driver image acquisition unit 11. The line of sight of the driver can be detected by detecting eyeballs and movements of the eyeballs of the driver from the driver image using a well-known method. The vehicle behavior can be detected from the state of the host vehicle recognized by the vehicle state recognition unit 13.
DRIVING CONSCIOUSNESS ESTIMATION DEVICE
A driving consciousness estimation device includes a driving readiness degree estimation unit configured to estimate a driving readiness degree relating to a driving consciousness of a driver based on a reaction time or a width of field of view of the driver and at least one of a time duration of eye glance away from road environment and an arousal level of the driver. An influence of the reaction time or the width of the field of view on the driving readiness degree estimated by the driving readiness degree estimation unit is greater than an influence of at least one of the time duration of eye glance away from road environment and the arousal level on the driving readiness degree.
[0005] A driving consciousness estimation device according to an aspect of the present disclosure includes a driving readiness degree estimation unit configured to estimate a driving readiness degree relating to a driving consciousness of a driver based on a reaction time or a width of field of view of the driver of a vehicle and at least one of a time duration of eye glance away from road environment and an arousal level of the driver. An influence of the reaction time or the width of the field of view on the driving readiness degree estimated by the driving readiness degree estimation unit is greater than an influence of at least one of the time duration of eye glance away from road environment and the arousal level on the driving readiness degree.
[0006] It can be seen that the reaction time or the width of the field of view of the driver further contributes to the driving safety than the time duration of eye glance away from road environment and the arousal level of the driver. Therefore, in the driving consciousness estimation device according to the aspect of the present disclosure, the influence of the reaction time or the width of the field of view on the driving readiness degree is set greater than the influence of at least one of the time duration of eye glance away from road environment and the arousal level. As a result, it is possible to estimate the driving readiness degree with sufficient consideration of the driving safety, and thus, it is possible to improve the driving safety.
https://worldwide.espacenet.com/publicationDetails/biblio?II=0&ND=3&adjacent=true&locale=en_EP&FT=D&date=20200213&CC=US&NR=2020047765A1&KC=A1#