The invention discloses a method for determining the position of a tracked object in virtual reality and a device and a system thereof The method comprises the steps that the image of the tracked object is acquired by a video camera, wherein a light reflecting body made of light reflecting material is adhered on the tracked object; the light reflecting point part in the image is determined, wherein the light reflecting point part is an image formed by the light reflected by the light reflecting body; the positional relation between the tracked object and the video camera is determined according to the light reflecting point part; and the position of the tracked object in the virtual reality is determined according to the positional relation Therefore, positioning of the tracked object can be realized in the virtual reality without additionally arranging multiple functions for the tracked object through application of the scheme

Method for determining position of tracked object in virtual reality and device and system thereof

The invention discloses a low-frequency vibration calibration device based on machine vision, and belongs to the technical field of vibration calibration. The device comprises a vibration table used for providing an excitation signal for low-frequency vibration calibration, a calibration plate used for calibrating a visual device in an imaging and image acquisition apparatus, a lighting apparatus used for providing lighting for the imaging and image acquisition apparatus when necessary, the imaging and image acquisition apparatus used for taking and acquiring a moving sequence image of the working surface of the vibration table in real time for low-frequency vibration calibration, an image transmission apparatus used for transmitting the low-frequency vibration sequence image acquired by the imaging and image acquisition apparatus in real time, and an image processing and displaying apparatus used for processing the acquired vibration sequence image as well as the stored data and waveform display of measured low-frequency vibration and outputting the calibration result. Compared with the traditional low-frequency vibration calibration device, the device is simple and convenient to operate, and low-frequency vibration calibration can be realized by only adjusting the installation height of the camera and the focal length of the lens in the visual device to get appropriate calibration fields under different calibration frequencies.

Low-frequency vibration calibration system based on machine vision

The invention relates to the field of sound recovering technology, and particularly to a device for recovering sound through vibration that is generated by the sound. The device comprises a high-speed image camera which is used for capturing mini-vibration information and recording, and a forced diagram. The forced diagram is tightly fixed on a carrier, and furthermore the forced diagram is in a visual line range of the high-speed image camera, wherein the high-speed image camera captures the vibration information of the forced diaphragm and then plays a vibration frequency through a computer or a processor for recovering the sound. Because a noncontact measurement method is utilized, the device has advantages of high precision, high sensitivity, long-distance measurement, no object damage, etc. In an application aspect, the device provides a new sound recovering mode, thereby expanding application range of visual measurement, facilitating long-distance mastering of conversion content in a crime field and facilitating quick detection of a criminal case. Along with quick development of high-speed image photographing technology, the cost of the device reduces gradually and application range expands.

Device for recovering sound by means of high-speed image photographing

The invention provides a vibration deformation observation method, a device and a recording method. The vibration frequency measurement is carried out on an observed vibration target, and a measurement result is recorded as f. After that, a square wave signal with the frequency thereof to be f-delta is synthesized, wherein delta is a preset frequency difference value. According to the square wave signal, a light source is controlled to flick at the frequency of f-delta. The deformation condition of an object in vibration is lengthened and displayed in time and the vibration of the object is lengthened to be f/delta times of the original vibration process. A vibration deformation observation device comprises a transducer, a signal conditioner and a frequency analysis module, a frequency synthesizer and a light source. According to the method, the phase difference is accumulated based on the frequency difference, so that the deformation of a high-speed vibrating object can be observed skillfully by naked eyes. Meanwhile, a common camera is used for the video recording of the deformation condition of the high-speed vibrating object. Meanwhile, the low-cost vibration deformation observation device is provided. The vibration deformation observation device is suitable for being popularized and used, and has important market value.

Vibration deformation observation method, device and recording method

The invention discloses a low-frame-rate camera large-visual-field vibration measurement device. The low-frame-rate camera large-visual-field vibration measurement device comprises a reflecting film, a camera positioning and adjusting portion, a square wave generating portion, a shooting controlling portion, a picture storing portion and a vibration information calculating portion, wherein the surface of an object to be measured is coated with the reflecting film in a pasted mode, a plurality of mark points distributed in a grid shape and provided with a predetermined number of rows are arranged on the reflecting film, the camera positioning and adjusting portion performs position on two low-frame-rate cameras and adjusts the low-frame-rate cameras to the same row of the mark points of picture capturing areas, a corresponding shooting picture is obtained by each low-frame-rate camera through shooting, the square wave generating portion is used for generating square waves, the shooting controlling portion controls the two low-frame-rate cameras to perform shooting on each row of the mark points row by row based on square waves with a predetermined length according to the predetermined sequence and controls the two low-frame-rate cameras to perform the shooting on each rising edge or falling edge of the square waves simultaneously, the vibration information calculating portion calculates out spatial position coordinates of the row of the mark points based on the two shooting pictures shot simultaneously, part of vibration information of each row of the mark points is further calculated out, and therefore the vibration information of the object to be measured is calculated out.

Low-frame-rate camera large-visual-field vibration measurement device

The invention provides a low-frame-rate camera visual vibration measurement device. The low-frame-rate camera visual vibration measurement device is characterized by comprising a camera positioning portion, a camera position relation obtaining portion, a shooting controlling portion, a picture storing portion and a vibration information calculating portion, wherein the camera positioning portion performs positioning on an even number of low-frame-rate cameras arrayed in a predetermined sequence and facing to an object to be measured, the two adjacent low-frame-rate cameras serve as a camera set, each camera set comprises a left side camera and a right side camera, the camera position relation obtaining portion is used for obtaining an intrinsic parameter matrix of each low-frame-rate camera, an intra-set position relation matrix of the two cameras in the same camera set and a between-set position relation matrix between the left side camera or the right side camera in each camera set and the corresponding camera in the first camera set, the shooting controlling portion controls the two low-frame-rate cameras in each camera set to perform shooting simultaneously and controls the shooting interval time of the two adjacent camera sets, the picture storing portion stores pictures correspondingly, and the vibration information calculating portion calculates vibration information according to the intrinsic parameter matrix, the intra-set position relation matrix and the between-set position relation matrix.

Low-frame-rate camera visual vibration measurement device

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Low-frame-rate camera large-visual-field vibration measurement device

Low-frame-rate camera visual vibration measurement device