Ultrasonic character recognition method

A person recognition and ultrasonic technology, applied in the field of person recognition, can solve problems such as misjudgment, and achieve the effect of improving detection efficiency, preventing misjudgment, and reducing misjudgment

Active Publication Date: 2019-07-19
LOCTEK ERGONOMIC TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing ultrasonic person recognition method still has the following technical problems: since the distance change is also detected at the beginning when the still object is moved into the measured range, Therefore there will be misjudgment

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] An ultrasonic person identification method, the method is based on an ultrasonic person identification system, the ultrasonic person identification system includes a background server and at least one ultrasonic sensor, the ultrasonic sensor is connected to the background server in communication, and the number of ultrasonic sensors is selected according to the requirements of coverage. For example, if a person who is required to cover the frontal angle of 45 degrees appears, a single ultrasonic sensor can be selected to meet the coverage requirements. On the accessories of the lifting table or the heightened table or the lifting table, the ultrasonic sensor is generally installed at the position near the front edge of the lifting table or the heightening table or the lifting table, and faces the user; such as figure 1 As shown, the method includes the following steps:

[0031] (1) The distance parameter signal is detected by the ultrasonic sensor and uploaded to the ba...

Embodiment 2

[0047] This embodiment is basically the same as Embodiment 1, except that the calculation method for calculating the variation of the distance parameter signal within a period of time T after the distance parameter signal changes abruptly is different. In this embodiment, in step (2), the distance parameter signal is taken at For several groups of adjacent peaks and troughs in the time T after the mutation, calculate the difference between the amplitudes of the adjacent peaks and troughs of each group, and sum the difference of the amplitudes of each group, that is, the distance parameter signal mutation is obtained. The variation of the distance parameter signal within a period of time T later. This setting can make the operation more convenient and help to improve the detection efficiency.

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Abstract

The invention relates to an ultrasonic character recognition method. The ultrasonic character recognition method is characterized by comprising the following steps that (1) distance parameter signalsare detected by ultrasonic sensors and uploaded to a back-end server, and whether the distance parameter signals detected by a certain ultrasonic sensor are suddenly changed or not is judged by the back-end server; if so, the situation that characters might appear in the detecting range of the ultrasonic sensor is determined, and a step (2) is conducted; and if not, the situation that no characterappears in the detecting range of the ultrasonic sensor is determined; and (2) according to the distance parameter signals detected by the ultrasonic sensors, whether variation of the distance parameter signals in duration of time T after the distance parameter signals are suddenly changed exceeds a first setting value or not is judged; if so, the situation that the characters appear in the detecting range of the ultrasonic sensor is determined; and if not, the situation that a still life appears in the detecting range of the ultrasonic sensor is determined. Erroneous judgement is not prone to occurring through the ultrasonic character recognition method.

Description

technical field [0001] The invention relates to the technical field of person identification, in particular to an ultrasonic person identification method. Background technique [0002] Ultrasound is a sound wave with a frequency higher than 20,000 Hz, which has good directionality and strong penetrating ability. Ultrasound is currently widely used in ranging, human body recognition and so on. The principle of ultrasonic ranging is to use the propagation speed of ultrasonic waves in the air to be known, measure the time when the sound waves are reflected from obstacles after being transmitted, and calculate the actual distance from the transmitting point to the obstacle according to the time difference between transmitting and receiving. The specific process is as follows: the ultrasonic transmitter emits ultrasonic waves in a certain direction, and starts timing at the same time as the emission time. The ultrasonic wave propagates in the air, and it returns immediately when...

Claims

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Application Information

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IPC IPC(8): G01S15/52G01S15/08
CPCG01S15/52G01S15/523G01S15/08
Inventor项乐宏
OwnerLOCTEK ERGONOMIC TECH CORP