Wearable device for blind people to avoid obstacles

Abstract

The invention discloses a wearable device for blind people to avoid obstacles, which comprises three ultrasonic sensors, a spectacle frame, a battery, two sound production units and a control unit; and the ultrasonic sensors can detect the distance of the obstacles. The detection range of the ultrasonic sensor is large; and the ultrasonic sensor is not affected by ambient light like laser and infrared optical sensors, so that the ultrasonic sensor is used for an obstacle avoidance device in the invention. The sensors (1) and (2) are mainly responsible for detecting obstacles close to the upper portion in a space; and the sensor (3) is mainly responsible for detecting obstacles close to the lower portion in the space. Through block detection of a key area, the possible distance of an obstacle is divided into a plurality of intervals; a certain angle is formed between the centre lines of the detection ranges of the first and second ultrasonic sensors; namely, the detection ranges of the first and second ultrasonic sensors point to the right and left respectively; and the detection range has an overlapped part, so that the recognition accuracy is improved, and meanwhile, the space positioning can be performed on the obstacle.

Description

technical field [0001] The invention relates to the technical field of ultrasonic ranging, in particular to a wearable device for blind people to avoid obstacles. Background technique [0002] Blind people have various difficulties in traveling, and they need to take auxiliary measures to avoid obstacles. At present, blind people mainly rely on guide sticks or guide dogs when they travel. However, guide sticks have the disadvantages of being unable to detect obstacles on the upper part of the body, and guide dogs have disadvantages such as high cost of use and few in number. Therefore, it is necessary to develop a Intelligent and effective obstacle avoidance aids for the blind. [0003] In recent years, there have been various patents on obstacle avoidance for the blind, but they are generally not practical. Therefore, there is no mature product on the market for obstacle avoidance for the blind. For example, the obstacle avoidance device for the blind in the prior art can...

AI Technical Summary

Problems solved by technology

At present, blind people mainly rely on guide sticks or guide dogs when they travel. However, guide sticks have the disadvantages of being unable to detect obstacles on the upper part of the body, and guide dogs have disadvantages such as high cost of use and few in number. Therefore, it is necessary to develop a Intelligent and effective obstacle avoidance aids for the blind

[0003] In recent years, there have been various patents on obstacle avoidance for the blind, but they are generally not practical. Therefore, there is no mature product on the market for obstacle avoidance for the blind.

For example, the obstacle avoidance device for the blind in the prior art can detect the obstacle ahead and inform the blind person through voice broadcast or vibration feedback, but these devices are not practical

[0004] However, there are some obvious deficiencies in the existing technology. For example, the existing technology uses infrared sensors for distance measurement, and the infrared sensor will produce a large error in the detection distance in a strong light environment, and cannot accurately measure and calculate obstacles. In addition, the infrared sensor can't effectively measure the distance for obstacles such as glass, so the device cannot reliably determine the position of obstacles in actual use; in addition, the detection range of infrared sensors is limited, and it may not be effective for obstacles such as railings. Distance measurement, and because the number of sensors of the obstacle avoidance device in the prior art is small, it can only detect obstacles in a small part of the space that the blind person travels through.

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