Liveness detection apparatus and method

1 . A liveness detection apparatus, comprising:

a camera, configured to capture a live image of a driver; and

a processor, coupled to the camera, configured to execute the following operations:

calculating an eye open duration of the driver based on the live image within a first time interval;

in response to the eye open duration exceeding a first duration threshold, executing a first confirmation operation to notify the driver to complete a liveness detection operation;

in response to the first confirmation operation has been executed, continuing to calculate the eye open duration based on the live image within a second time interval, wherein the second time interval is later than the first time interval; and

in response to the eye open duration exceeding a second duration threshold, executing a second confirmation operation to notify the driver to complete the liveness detection operation, wherein the second duration threshold is greater than the first duration threshold.

2 . The liveness detection apparatus of claim 1 , wherein the operation of calculating the eye open duration further comprises:

calculating a first eye-opening ratio of the driver in the live image within the first time interval; and

determining whether the driver opens their eyes based on the first eye-opening ratio.

3 . The liveness detection apparatus of claim 2 , wherein the operation of calculating the first eye-opening ratio of the driver in the live image further comprises:

searching for a plurality of eye feature points of the driver in the live image; and

calculating the first eye-opening ratio of the driver in the live image based on the eye feature points.

4 . The liveness detection apparatus of claim 2 , wherein the operation of calculating the first eye-opening ratio of the driver in the live image further comprises:

calculating a first distance between an upper eyelid and a lower eyelid;

calculating a second distance between a left eye corner and a right eye corner; and

calculating a ratio of the first distance and the second distance as the first eye-opening ratio.

5 . The liveness detection apparatus of claim 1 , wherein the operation of calculating the eye open duration further comprises:

calculating a plurality of second eye-opening ratios of the driver in the live image within a third time interval;

calculating a ratio threshold based on the second eye-opening ratios; and

calculating the eye open duration within the first time interval and the second time interval based on the ratio threshold.

6 . The liveness detection apparatus of claim 1 , wherein the first confirmation operation comprises the following operation:

generating a notify signal to control an output apparatus to send a reminder.

7 . The liveness detection apparatus of claim 1 , wherein the second confirmation operation comprises the following operations:

increasing a triggered count; and

in response to the triggered count exceeding a count threshold, adjusting a driving assistance parameter, wherein the driving assistance parameter is configured to determine a level of driving assistance involvement for a vehicle drove by the driver.

8 . The liveness detection apparatus of claim 1 , wherein the processor is further configured to execute the following operation:

in response to determining the driver closing their eyes, recalculating the eye open duration of the driver in the live image.

9 . The liveness detection apparatus of claim 1 , wherein the processor is further configured to execute the following operations:

determining whether the driver is in a high-risk driving state based on one or more vehicle parameter; and

in response to the driver being in the high-risk driving state, reducing the first duration threshold and the second duration threshold.

10 . The liveness detection apparatus of claim 1 , wherein the processor is further configured to execute the following operations:

calculating a weight based on one or more vehicle parameter; and

calculating the first duration threshold and the second duration threshold based on the weight.

11 . A liveness detection method, being adapted for use in an electronic apparatus, wherein the liveness detection method comprises the following steps:

capturing a live image of a driver;

calculating an eye open duration of the driver based on the live image within a first time interval;

in response to the eye open duration exceeding a first duration threshold, executing a first confirmation operation to notify the driver to complete a liveness detection operation;

in response to the first confirmation operation has been executed, continuing to calculate the eye open duration based on the live image within a second time interval, wherein the second time interval is later than the first time interval; and

in response to the eye open duration exceeding a second duration threshold, executing a second confirmation operation to notify the driver to complete the liveness detection operation, wherein the second duration threshold is greater than the first duration threshold.

12 . The liveness detection method of claim 11 , wherein the step of calculating the eye open duration further comprises:

calculating a first eye-opening ratio of the driver in the live image within the first time interval; and

determining whether the driver opens their eyes based on the first eye-opening ratio.

13 . The liveness detection method of claim 12 , wherein the step of calculating the first eye-opening ratio of the driver in the live image further comprises:

searching for a plurality of eye feature points of the driver in the live image; and

calculating the first eye-opening ratio of the driver in the live image based on the eye feature points.

14 . The liveness detection method of claim 12 , wherein the step of calculating the first eye-opening ratio of the driver in the live image further comprises:

calculating a first distance between an upper eyelid and a lower eyelid;

calculating a second distance between a left eye corner and a right eye corner; and

calculating a ratio of the first distance and the second distance as the first eye-opening ratio.

15 . The liveness detection method of claim 11 , wherein the step of calculating the eye open duration further comprises:

calculating a plurality of second eye-opening ratios of the driver in the live image within a third time interval;

calculating a ratio threshold based on the second eye-opening ratios; and

calculating the eye open duration within the first time interval and the second time interval based on the ratio threshold.

16 . The liveness detection method of claim 11 , wherein the first confirmation operation comprises the following step:

generating a notify signal to control an output apparatus to send a reminder.

17 . The liveness detection method of claim 11 , wherein the second confirmation operation comprises the following steps:

increasing a triggered count; and

in response to the triggered count exceeding a count threshold, adjusting a driving assistance parameter, wherein the driving assistance parameter is configured to determine a level of driving assistance involvement for a vehicle drove by the driver.

18 . The liveness detection method of claim 11 , further comprising:

in response to determining the driver closing their eyes, recalculating the eye open duration of the driver in the live image.

19 . The liveness detection method of claim 11 , further comprising:

determining whether the driver is in a high-risk driving state based on one or more vehicle parameter; and

in response to the driver being in the high-risk driving state, reducing the first duration threshold and the second duration threshold.

20 . The liveness detection method of claim 11 , further comprising:

calculating a weight based on one or more vehicle parameter; and

calculating the first duration threshold and the second duration threshold based on the weight.