CN111324203A

CN111324203A - Vibration texture touch information acquisition and display device

Info

Publication number: CN111324203A
Application number: CN202010112337.7A
Authority: CN
Inventors: 刘倩; 陈锐; 杜伟强; 张强
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2020-02-24
Filing date: 2020-02-24
Publication date: 2020-06-23

Abstract

The invention belongs to the technical field of novel electronic components in electronic information technology, relates to a vibration texture touch information acquisition and display device, and can be applied to the fields of texture touch information acquisition, data compression, virtualization, simulation rendering and the like. The device comprises an acquisition device and a display device, and consists of a three-axis acceleration sensor, a power supply, an NI data acquisition card, a voice coil motor, an earphone wire, a power amplifier and an upper computer. The method describes the surface textures of different objects through different vibration touch signals, is simple and easy to implement, has higher precision of the collected vibration touch signals and discrimination, and can visually see the collected results. The texture senses collected by the device can be used as a training set, and a classifier is trained after feature extraction, so that the object texture recognizer is obtained. The object texture recognizer can recognize the object texture in reality, can be applied to the fields of VR/AR texture touch rendering, e-commerce and the like, and has wide application prospects.

Description

Vibration texture touch information acquisition and display device

Technical Field

The invention belongs to the technical field of electronic information technology, and particularly relates to a vibration texture touch information acquisition and display device which can be applied to the fields of texture touch information acquisition, data compression, virtualization, simulation rendering and the like.

Background

Human tactile perception includes two parts, namely kinesthetic (information on forces, torques, positions, velocities, etc. sensed by muscles, joints and tendons) and textural (information on surface structures and friction, etc. sensed by mechanoreceptors on the skin). Compared with the relatively mature visual perception and auditory perception, the research on the touch sense is still in the primary stage, but the industrial application prospect is wide, for example, in the VR/AR field, the sense of reality is greatly increased by adding the touch sense perception, and the user experience is improved; in the E-commerce field, texture touch perception is added, so that a user can feel the material of clothes when purchasing the clothes.

Texture haptic is different from kinesthetic and cannot be described in terms of speed, force, etc. Texture touch is the description of how smooth a material surface is when a person touches an object. Since a person's contact with the texture of the surface of an object generates friction and thus vibration, measuring the tactile sensation of the person's touch to the texture of the surface of the object using the magnitude of the vibration is a characterization method of texture touch, also called vibrotexture touch. The vibrotactile texture signals reflect the roughness of the surface of an object, such as a rough object, the friction is high, and the vibrotactile information is relatively strong; a smooth object will vibrate gently.

Disclosure of Invention

According to the principle of vibrotactile texture, the invention aims to provide a vibrotactile information acquisition and display device, an acceleration sensor is used for measuring vibrotactile signals of surface textures of different objects, and the acquired vibrotactile signals can be displayed by a voice coil motor or an electromagnetic valve and other devices.

A vibrotexture tactile information acquisition and display device comprises an acquisition device and a display device:

the acquisition device comprises a three-axis acceleration sensor, a power supply, an NI data acquisition card and an upper computer; the three-axis acceleration sensor rubs on the surface of an object to be detected to acquire a vibration touch signal and outputs acquired acceleration information to the NI data acquisition card, and the power supply supplies power to the NI data acquisition card; the NI data acquisition card transmits acquired data to an upper computer in a digital signal form through a USB to finish the acquisition process after analog-to-digital conversion, and the upper computer stores acquired vibration touch signals in an audio file form.

The display device comprises a voice coil motor, a power supply, an earphone wire and a power amplifier; the upper computer outputs the collected vibration touch signal to a power amplifier in an audio form through an earphone cable, the vibration touch signal is displayed in a vibration form by a voice coil motor after being subjected to power amplification, and the power amplifier is powered by a power supply; the voice coil motor can convert an input electric signal into mechanical energy for outputting a vibration touch signal.

The invention has the beneficial effects that:

(1) the invention describes the surface textures of different objects through different vibration tactile signals. The method is simple and easy to implement, the acquired vibrotactile signals are high in precision and have distinction degree, and the acquired results can be visually seen.

(2) The texture senses collected by the device can be used as a training set, and a classifier is trained after feature extraction, so that the object texture recognizer is obtained. The object texture recognizer can recognize the object texture in reality, can be applied to the fields of VR/AR texture touch rendering, e-commerce and the like, and has wide application prospects.

Drawings

FIG. 1 is a block diagram of the acquisition device connection of the present invention;

FIG. 2 is a connection diagram of an embodiment of a triaxial acceleration sensor ADXL 335;

FIG. 3 is a connection block diagram of a display device according to the present invention;

FIG. 4 is a flow chart of the acquisition operation of the present invention;

FIG. 5 is a flow chart of the display operation of the present invention;

FIG. 6 is a waveform of vibrotactile signals of different materials collected in accordance with the present invention;

FIG. 7 is a block diagram of a system for object texture recognition according to the present invention.

Detailed Description

The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.

1. The acquisition device is connected according to the following steps and the diagram of figure 1:

in the embodiment, an adopted triaxial acceleration sensor is ADXL335, which is a small triaxial accelerometer with high precision and low power consumption, outputs voltage signals, and can measure dynamic acceleration caused by motion, impact or vibration. An NI data acquisition card is selected as an analog-to-digital converter, and a power supply supplies 5V voltage to the NI data acquisition card, so that an analog signal can be converted into a digital signal. Selecting an upper computer as a computer, wherein the upper computer is configured as: i7-8700@3.2GHz, win10 operating system, 16GB RAM.

The ADXL335 triaxial acceleration sensor is adhered to one side of a 100g weight, the other side of the weight is in contact with the surface of an object, and the contact surface of the weight and the object is provided with a bulge, so that the force applied when a simulated human touches the object through back-and-forth friction on the surface of the object is facilitated. The ground and fire wires of the ADXL335 are connected to the ground and fire wires of the USB cable, see fig. 2. The ADXL335 acceleration sensor comprises a three-axis sensor, a power amplifier, a demodulator and a resistor; the output port of the three-axis sensor is connected with the input end of a power amplifier, the output end of the power amplifier is connected with the input end of a demodulator, the demodulator is provided with 3 output ends which respectively output three currents, the output currents are respectively output to the x axis, the y axis and the z axis of the ADXL335 acceleration sensor through 32 kiloohm resistors, and the acquired acceleration of the x axis, the y axis and the z axis is respectively output. The NI data acquisition card is provided with eight input ports, three of the input ports are connected with the output of the three-axis acceleration sensor, two of the input ports are connected with the power supply, and the remaining three input ports are idle. The NI data acquisition card is output in a USB form and is connected to a USB port of the computer.

2. The acquisition operation is completed according to fig. 4 and the following steps:

starting an upper computer, running a driving program, prompting to wait for three seconds to start acquisition, firstly suspending ADXL335 horizontally for five seconds to zero within the next ten seconds, horizontally rubbing the ADXL335 on the surface of an object to be detected three to five times at a constant speed within five seconds after zero calibration operation is completed, finishing texture perception acquisition, and storing the acquired texture perception signals into an audio file (such as wav format) by the upper computer.

3. The display device is connected according to fig. 3 and the texture sensation signal is displayed according to the steps of fig. 5.

The output port of the upper computer is connected with the power amplifier through an earphone cord, the output of the power amplifier is connected with the voice coil motor through two wires, and a power supply with the voltage of 12V is selected to supply power for the power amplifier. And when an audio file of the upper computer is operated, the texture sensation signal is firstly output to the power amplifier in an audio form, the power amplifier is adjusted to a proper amplification factor and is output to the voice coil motor, and the voice coil motor outputs the audio signal in a vibration form.

Fig. 6 shows the vibrotactile waveforms of objects of different textures acquired by the device of the invention, it can be clearly seen that the rougher the surface, the stronger the waveform, such as granite, the higher the frequency and amplitude of the vibrotactile signal it causes, the more severe the fluctuation, and the smoother the waveform and the lower the frequency of cork with a smooth surface.

The texture senses collected by the device can be used as a training set, and a classifier is trained after feature extraction, so that the object texture recognizer is obtained. The object texture recognizer can recognize the texture of an object in reality, the block diagram of an object texture recognition system is shown in figure 7, and the object texture recognizer comprises two parts of feature extraction and classifier training. The operation steps are as follows: the texture sensation acquisition device is horizontally rubbed back and forth at a constant speed on the surface of the object to be detected, and after the texture sensation acquisition work is completed, the texture sensation acquisition device outputs vibration touch signals to the object texture recognizer and then outputs the material quality of the object.

Claims

1. The utility model provides a vibrotexture sense of touch information acquisition and display device which characterized in that, includes collection system and display device:

the acquisition device comprises a three-axis acceleration sensor, a power supply, an NI data acquisition card and an upper computer; the three-axis acceleration sensor rubs on the surface of an object to be detected to acquire a vibration touch signal and outputs acquired acceleration information to the NI data acquisition card, and the power supply supplies power to the NI data acquisition card; the NI data acquisition card transmits acquired data to an upper computer in a digital signal form through a USB to finish the acquisition process after analog-to-digital conversion, and the upper computer stores the acquired vibration touch signal in an audio file form;

the display device comprises a voice coil motor, a power supply, an earphone wire and a power amplifier; the upper computer outputs the collected vibration touch signal to a power amplifier in an audio form through an earphone cable, the vibration touch signal is displayed in a vibration form by a voice coil motor after being subjected to power amplification, and the power amplifier is powered by a power supply; the voice coil motor converts the input electric signal into mechanical energy for outputting a vibration tactile signal.