Blindman navigation method and blindman navigation apparatus

1. A blindman navigation method, comprising:

obtaining image information of surroundings where a user is located;

determining a distance between the user and a traffic signal light according to the image information; and

judging a distance between the user and a crossing according to the distance between the user and the traffic signal light, and determining the user is in a state where he/she has arrived at the crossing when the distance between the user and the crossing is less than or equal to a first distance threshold that is preset;

wherein determining the distance between the user and the traffic signal light according to the image information comprises:

generating traffic signal light shape information according to the image information; and

determining the distance between the user and the traffic signal light according to a corresponding variation relationship between a size of the traffic signal light in the generated traffic signal light shape information and a distance between the user and the traffic signal light; and

wherein generating the traffic signal light shape information according to the image information comprises:

performing an enhancement treatment on the image information obtained;

converting the image information after the enhancement treatment from a RGB color space to an HSV color space; and

extracting an edge feature of a region with a specific brightness according to a brightness component in the image information, and comparing the extracted edge feature of the region with the specific brightness with an edge feature of the traffic signal light that is preset so as to extract an image of the traffic signal light in the region with the specific brightness to generate traffic signal light shape information.

2. The blindman navigation method according to claim 1 , wherein judging the distance between the user and the crossing according to the distance between the user and a traffic signal light comprises:

acquiring a width of a road;

calculating a difference value between the distance between the user and the traffic signal light and the width of the road; and

determining the user is in a state where he/she has arrived at the crossing when the difference value is less than or equal to a second distance threshold.

3. The blindman navigation method according to claim 1 , further comprising:

determining traffic signal light color information and traffic signal light duration information according the image information when determining the user is in a state where he/she has arrived at the crossing, and obtaining acceleration information of the user; and

generating navigation information according to the traffic signal light color information, the traffic signal light duration information and the acceleration information, the navigation information including stop information and advance information.

4. The blindman navigation method according to claim 3 , wherein determining the traffic signal light color information and the traffic signal light duration information according the image information comprises:

determining a color of the traffic signal light according to a hue component of the traffic signal light image extracted, and generating the traffic signal light color information; and

identifying a digital image of a specific traffic signal light color information to determine a rest duration of the traffic signal light and generate the traffic signal light duration information.

5. The blindman navigation method according to claim 3 , wherein generating navigation information according to the traffic signal light color information, the traffic signal light duration information and the acceleration information comprises:

judging whether a color of the current traffic signal light is green or not according to the traffic signal light color information, and generating the stop information when the color of the traffic signal light is not green;

generating the traffic signal light duration information when the color of the current traffic signal light is green, and obtaining the acceleration information of the user, to determine an average advance velocity of the user according to the acceleration information obtained;

generating a theoretical traveling distance according to a product of the average advance velocity and the traffic signal light duration and comparing the theoretical traveling distance with the distance between the user and the traffic signal light;

generating the advance information when the theoretical traveling distance is greater than the distance between the user and the traffic signal light; and

generating the stop information when the theoretical traveling distance is less than the distance between the user and the traffic signal light.

6. The blindman navigation method according to claim 3 , further comprising:

converting the navigation information into an audio signal for transmission to a voice device, and controlling the voice device to convert the audio signal into voice and play it.

7. The blindman navigation method according to claim 3 , further comprising:

judging whether the user tumbles or not according to the acceleration information obtained, and judging the user has tumbled when a value of the acceleration information in a vertical direction is greater than a preset value and generating an alarm signal when judging the user has tumbled; and

controlling an alarm device to make an alarm according to the alarm signal.

8. The blindman navigation method according to claim 7 , wherein controlling the alarm device to make an alarm according to the alarm signal comprises:

controlling the alarm device to send out an acousto-optic alarm.

9. The blindman navigation method according to claim 7 , further comprising:

further controlling a communication device to make a call to an associated mobile terminal and transmitting tumble alarm information including preset content, when generating the alarm signal.

10. The blindman navigation method according to claim 9 , wherein the tumble alarm information including preset content comprises tumble prompt information and the user's position information.