Vision-based interactive control apparatus and method of controlling rear-view mirror for vehicle

1. A method of controlling a rear-view mirror for a vehicle, the rear-view mirror having a first side and a second side opposite to the first side, the second side being a light reflective side of the rear-view mirror;

the method comprises:

determining a gaze position and a gaze direction of a user;

controlling the rear-view mirror based on the user's gaze position and gaze direction

detecting a first light intensity received from the first side and detecting a second light intensity received from the second side;

evaluating whether a transition from a presence of a gaze position in the rear-view mirror to an absence of the gaze position in the rear-view mirror has occurred in a threshold period of time; and

controlling the rear-view mirror in an anti-glare mode in response to a difference between the first light intensity and the second light intensity being equal to or greater than a threshold value, and an evaluation that the transition has occurred.

2. The method of claim 1 , further comprising:

illuminating the user's eye using a plurality of light sources;

capturing a plurality of images of the user's face;

identifying an eye region containing the user's eye in one of the plurality of images;

detecting the plurality of glints in the eye region;

calculating a center of a pupil of the user; and

determining a relative positional relationship between the center of the pupil of the user and the plurality of glints respectively from the plurality of light sources in each of the plurality of images of the user's face;

thereby determining a plurality of relative positional relationships between the center of the pupil of the user and the plurality of glints, respectively from a plurality of eye regions in the plurality of images of the user's face.

3. The method of claim 2 , further comprising adjusting a light emission intensity of the one of the plurality of light sources in response to a grayscale of one of the plurality of glints corresponding to the one of the plurality of light source being lower than a threshold grayscale.

4. The method of claim 2 , wherein determining the user's gaze position and gaze direction are performed based on the plurality of relative positional relationships between the center of a pupil of the user and the plurality of glints.

5. The method of claim 4 , further comprising calibrating the user's gaze position and gaze direction and the plurality of relative positional relationships between the center of a pupil of the user and the plurality of glints.

6. The method of claim 3 , wherein controlling the rear-view mirror based on the user's gaze position and gaze direction comprises controlling image display in an image display area of the rear-view mirror based on the user's gaze position and gaze direction; and

the method further comprises evaluating whether the user is looking at the image display area of the rear-view mirror based on the user's gaze position and gaze direction.

7. The method of claim 6 , wherein controlling image display in the image display area of the rear-view mirror comprises controlling the image display in the image display area of the rear-view mirror in a dimming mode in response to an evaluation indicating that the user is not looking at the image display area, and controlling the image display in the image display area of the rear-view mirror in a normal mode in response to an evaluation indicating that the user is looking at the image display area; and

a brightness level of the image display in the dimming mode is lower than that in the normal mode.

8. The method of claim 6 , wherein one or more selectable objects are displayed in the image display area of the rear-view mirror;

the method further comprises evaluating whether a gaze position is within a threshold distance from a selectable object for a duration greater than a threshold duration; and

selecting the selectable object out of the one or more selectable objects displayed in the image display area in response to a gaze status indicating that the gaze position is within the threshold distance from the selectable object for the duration greater than the threshold duration.

9. The method of claim 6 , further comprising controlling the rear-view mirror in an anti-glare mode in response to one or more glare conditions being detected, a reflectivity of the rear-view mirror in the anti-glare mode being dimmed.

10. The method of claim 1 ,

wherein a difference between the first light intensity and the second light intensity is a detected value less than the threshold value at a time the transition has occurred; and

the method further comprising updating the threshold value with the detected value.

11. The method of claim 1 , further comprising turning off the anti-glare mode in response to a difference between the first light intensity and the second light intensity being smaller than the threshold value.

12. A vision-based interactive control apparatus, comprising:

an image processor configured to determine a gaze position and gaze direction of a user;

a rear-view mirror, the rear-view mirror having a first side and a second side opposite to the first side, the second side being a light reflective side of the rear-view mirror;

a first photosensor configured to detect a first light intensity received from the first side and a second photosensor configured to detect a second light intensity received from the second side; and

a controller coupled to the rear-view mirror and the image processor;

wherein the image processor is configured to evaluate whether a transition from a presence of a gaze position in the rear-view mirror to an absence of the gaze position in the rear- view mirror has occurred in a threshold period of time; and

the controller is configured to control the rear-view mirror based on the user's gaze position and gaze direction, and control the rear-view mirror in an anti-glare mode in response to the second light intensity being greater than the first light intensity by a first intensity value equal to or greater than a threshold intensity value, and an evaluation that the transition has occurred.

13. The vision-based interactive control apparatus of claim 12 , further comprising:

a plurality of image sensors configured to capture a plurality of images of a user's face; and

a plurality of light sources configured to illuminate the user's eye;

wherein the image processor is coupled to the plurality of image sensors and configured to determine the user's gaze position and gaze direction based on a relative positional relationship between a center of a pupil of the user and a plurality of glints respectively from the plurality of light sources in each of the plurality of images of the user's face.

14. The vision-based interactive control apparatus of claim 13 , wherein

the image processor comprises a plurality of image feature analyzers corresponding to the plurality of image sensors, each of the plurality of image feature analyzers is configured to

identify an eye region containing the user's eye in one of the plurality of images;

detect the plurality of glints in the eye region;

calculate a center of the pupil of the user; and

determine the relative positional relationship between the center of the pupil of the user and the plurality of glints;

wherein the plurality of image feature analyzers determine a plurality of relative positional relationships between the center of the pupil of the user and the plurality of glints, respectively from a plurality of eye regions in the plurality of images of the user's face.

15. The vision-based interactive control apparatus of claim 14 , wherein the rear-view mirror comprises an image display panel in an image display area;

the controller is configured to control image display in the rear-view mirror based on the user's gaze position and gaze direction; and

the image processor further comprises a gaze detector configured to calculate the user's gaze position and gaze direction based on the plurality of relative positional relationships between the center of a pupil of the user and the plurality of glints.

16. The vision-based interactive control apparatus of claim 15 , wherein the image processor further comprises a gaze status evaluator configured to evaluate whether the user is looking at the image display area of the rear-view mirror based on the user's gaze position and gaze direction.

17. A rear-view mirror assembly, comprising the vision-based interactive control apparatus of claim 12 .

18. A vehicle, comprising the vision-based interactive control apparatus of claim 12 .

19. A method of controlling a rear-view mirror for a vehicle, the rear-view mirror having a first side and a second side opposite to the first side, the second side being a light reflective side of the rear-view mirror;

the method comprises:

determining a gaze position and a gaze direction of a user; controlling the rear-view mirror based on the user's gaze position and gaze direction

detecting a first light intensity received from the first side and detecting a second light intensity received from the second side;

controlling the rear-view mirror in an anti-glare mode in response to a difference between the first light intensity and the second light intensity being equal to or greater than a threshold value;

controlling the rear-view mirror in a first anti-glare mode having a first anti-glare parameter in response to the second light intensity being greater than the first light intensity by an intensity value in a first range;

evaluating whether a transition from a presence of a gaze position in the rear-view mirror to an absence of the gaze position in the rear-view mirror occurs in a threshold period of time when the second light intensity is greater than the first light intensity by the intensity value in the first range; and

controlling the rear-view mirror in a second anti-glare mode having a second anti- glare parameter different from the first anti-glare parameter in response to an evaluation that the transition has occurred when the second light intensity is greater than the first light intensity by the intensity value in the first range.