CN111324203A - Vibration texture touch information acquisition and display device - Google Patents

Abstract

The technical field of the present invention is a novel electronic component in electronic information technology, and relates to a vibration texture tactile information acquisition and display device, which can be applied to the fields of texture tactile information acquisition, data compression, virtual and simulation rendering, and the like. The device includes an acquisition device and a display device, and is composed of a three-axis acceleration sensor, a power supply, an NI data acquisition card, a voice coil motor, an earphone cable, a power amplifier and a host computer. The present invention describes different object surface textures through different vibrotactile signals, the operation is simple and easy to implement, and the collected vibrotactile signals have high precision and discrimination, and the collected results can be seen intuitively. The texture perception collected by the device of the present invention can be used as a training set, and after feature extraction is performed, a classifier is trained to obtain an object texture recognizer. The object texture recognizer can recognize the object texture in reality, and can be applied to VR/AR texture tactile rendering, e-commerce and other fields, and has broad application prospects.

Description

Vibration texture tactile information acquisition and display device

technical field

The technical field of the present invention is electronic information technology—new electronic components, and more particularly, relates to a vibration texture tactile information acquisition and display device, which can be applied to the fields of texture tactile information acquisition, data compression, virtual and simulation rendering, and the like.

Background technique

Human tactile perception consists of two parts, namely kinesthetic (force, torque, position, speed, etc. information sensed by muscles, joints and tendons) and texture sense (surface structure and friction sensed by mechanoreceptors on the skin, etc.) information). Compared with the more mature visual and auditory perception, the research on tactile is still in its infancy, but its industrial application prospects are broad, such as in the field of VR/AR, adding tactile perception will greatly increase the sense of reality and improve the user experience; e-commerce field , adding texture tactile perception, which can make users feel the material of clothes when they buy clothes.

Texture touch is different from kinesthetic sense and cannot be described in terms of speed and force. Texture haptics is a description of how smooth the surface of an object is when a person touches it. Since people touch the texture of the surface of the object, they will generate friction and then vibration, so using the magnitude of the vibration to measure the tactile feeling of the surface texture of the object is a characterization method of texture tactile, also known as vibratory texture tactile sensation. Vibration texture tactile signals reflect the roughness of the surface of an object. For example, rough objects have a large friction force, and the vibration tactile information is relatively strong; smooth objects have gentle vibrations.

SUMMARY OF THE INVENTION

According to the vibration texture tactile principle, the purpose of the present invention is to provide a vibration texture tactile information collection and display device, which uses an acceleration sensor to measure the vibration tactile signals of different object surface textures, and the collected vibration tactile signals can be displayed by a voice coil motor or a voice coil motor. Solenoid valve and other equipment to achieve.

A vibration texture tactile information collection and display device, comprising a collection device and a display device:

The acquisition device includes a triaxial acceleration sensor, a power supply, an NI data acquisition card and a host computer; the triaxial acceleration sensor rubs on the surface of the object to be measured to collect vibrotactile signals, and outputs the collected acceleration information to the NI Data acquisition card, the power supply is NI data acquisition card; the NI data acquisition card, after analog-to-digital conversion of the collected data, transmits the collected data to the host computer in the form of digital signals through USB to complete the acquisition process, and the host computer will collect the data. The vibrotactile signal is saved as an audio file.

The display device includes a voice coil motor, a power supply, an earphone wire and a power amplifier; the host computer outputs the collected vibrotactile signal to the power amplifier in the form of audio through the earphone wire, and the vibrotactile signal is amplified by the power and sent to the power amplifier. The voice coil motor completes the display of the vibrotactile signal in the form of vibration, and the power amplifier is powered by the power supply; the voice coil motor can convert the input electrical signal into mechanical energy for outputting the vibrotactile signal.

Beneficial effects of the present invention:

(1) The present invention describes the surface texture of different objects through different vibrotactile signals. The operation is simple and easy to implement, and the collected vibrotactile signals have high precision and discrimination, and the collected results can be seen intuitively.

(2) The texture perception collected by the device of the present invention can be used as a training set, and after feature extraction is performed, a classifier is trained, and an object texture recognizer is obtained. The object texture recognizer can recognize the object texture in reality, and can be applied to VR/AR texture tactile rendering, e-commerce and other fields, and has broad application prospects.

Description of drawings

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

Fig. 2 is the connection diagram of three-axis acceleration sensor ADXL335 in the embodiment;

3 is a connection block diagram of a display device of the present invention;

Fig. 4 is the collection operation flow chart of the present invention;

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

Fig. 6 is the vibrotactile signal waveform of different materials collected by the present invention;

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

Detailed ways

The specific embodiments of the present invention are further described below with reference to the accompanying drawings and technical solutions.

1. Connect the acquisition device according to Figure 1 and the following steps:

The three-axis accelerometer selected in this embodiment is ADXL335, which is a small three-axis accelerometer with high precision and low power consumption. The output is a voltage signal, which can measure the dynamic acceleration caused by motion, shock or vibration. The NI data acquisition card is selected as the analog-to-digital converter, and the power supply provides 5V voltage for it, which can convert analog signals into digital signals. The host computer is selected as the computer, and its configuration is: i7-8700@3.2GHz, win10 operating system, 16GB RAM.

The ADXL335 triaxial acceleration sensor is pasted with a 100g weight on one side, and the other side of the weight is in contact with the surface of the object. The contact surface between the weight and the object should have protrusions, so that it can be used to simulate people touching the object by rubbing back and forth on the surface of the object. strength. The ground and fire wires of the ADXL335 are connected to the ground and fire wires of the USB cable, see Figure 2. The ADXL335 acceleration sensor includes a triaxial sensor, a power amplifier, a demodulator, and a resistor; the output port of the triaxial sensor is connected to the input end of the power amplifier, and the output end of the power amplifier is connected to the input end of the demodulator, and the demodulator has 3 Each output terminal outputs three currents respectively. The output currents are respectively output to the x-axis, y-axis and z-axis of the ADXL335 accelerometer through a 32 kΩ resistor, and the collected accelerations of the x-axis, y-axis and z-axis are respectively output. The NI data acquisition card has eight input ports, three of which are connected to the output of the three-axis acceleration sensor, two are connected to the power supply, and the remaining three input ports are free. The NI data acquisition card outputs in the form of USB and is connected to the USB port of the computer.

2. Follow Figure 4 and the following steps to complete the acquisition operation:

Turn on the host computer, run the driver program, and prompt to wait for three seconds to start the acquisition. In the next ten seconds, firstly suspend the ADXL335 horizontally for five seconds to calibrate the zero, and rub the ADXL335 horizontally back and forth on the surface of the object to be measured at a constant speed within five seconds after the zero calibration operation is completed. Three to five times, the texture sense acquisition is completed, and the host computer saves the collected texture sense signal as an audio file (such as wav format).

3. Connect the display device according to Figure 3, and display the texture sensory signal according to the steps in Figure 5.

The output port of the host computer is connected with the power amplifier through the headphone cable, the output of the power amplifier is connected with the voice coil motor through two wires, and the power amplifier is powered by a 12V power supply. Run the audio file of the host computer, the texture sensory signal is first output to the power amplifier in the form of audio, adjust the power amplifier to the appropriate magnification, and output to the voice coil motor, and the voice coil motor outputs the audio signal in the form of vibration.

Fig. 6 shows the vibrotactile waveforms of objects with different textures collected by the device of the present invention. It can be clearly seen that the rougher the surface, the stronger the waveform. The smooth surface of the cork, the waveform is flat, the frequency is low.

The texture perception collected by the device of the present invention can be used as a training set, and after feature extraction is performed, a classifier is trained to obtain an object texture recognizer. The object texture recognizer can recognize the object texture in reality. The block diagram of the object texture recognition system is shown in Figure 7. The object texture recognizer includes two parts: feature extraction and classifier training. The operation steps are: rubbing the texture sensory acquisition device horizontally back and forth on the surface of the object to be measured at a constant speed, after completing the texture sensory acquisition work, the texture sensory acquisition device outputs vibrotactile signals to the object texture recognizer and then outputs the object material.

Claims (1)

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.

Images