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83 results about "Videokymography" patented technology

Videokymography is a high-speed medical imaging method to visualize the human vocal fold vibration dynamics. It was invented by Jan G. Švec. A digital technique for high-speed visualization of vibration, called videokymography, was developed and applied to the vocal folds. The system uses a modified video camera able to work in two modes: high-speed (nearly 8,000 images/s) and standard (50 images/s in CCIR norm). In the high-speed mode, the camera selects one active horizontal line (transverse to the glottis) from the whole laryngeal image. The successive line images are presented in real time on a commercial TV monitor, filling each video frame from top to bottom. The system makes it possible to observe left-right asymmetries, open quotient, propagation of mucosal waves, movement of the upper and, in the closing phase, the lower margins of the vocal folds, etc. The technique is suitable for further processing and quantification of recorded vibration.

Method for measuring solid particle three-dimensional concentration field and velocity field in gas/solid two-phase stream

The invention discloses a kind of method of measurement the solid particle three-dimensional density field in the gas and solid two phase flow, velocity field and equipment. The particle flux transmitting tube is laid at the front of high rate stereoscopic vision system which is consisted by the double look-out angle lens stereoscope and the high rate camera and the jet stream particle is refracted through the double look-out angle lens stereoscope mirror face and the single high rate camera target area can achieve the particle flux graphic with two different angles at the same time and after the graphic is input the computer a program module which is consisted by the pattern recognition algorithm procedure and three-inversion projection algorithm procedure treats the particle diagram and then get the transient three-dimensional density field. The program module treats series microsecond class time sequence changeable particle graphic and gets the particle three-dimensional movement trace and the velocity field. It is stabilize by using the single camera system and overcomes the problem of multiple camera system's constructer is complex and the synchronism is bad.
Owner:ZHEJIANG UNIV

Gas-liquid two-phase flow type recognition method based on digital graphic processing technique

The invention relates to a gas-liquid two-phase flow pattern recognition method based on digital image processing technology, which is characterized in that the method uses a high-speed camera to gain the gas-liquid two-phase flow image in a horizontal pipeline under the different working conditions; the characteristics of invariant moment and gray level co-occurrence matrix of the image are extracted by the image processing technology; the characteristic fusion is implemented by using a rough set theory to reduce the characteristic dimensions, and the characteristic vector forms a flow pattern sample to implement the training for a support vector machine in order to complete the mapping from the characteristic space to the flow pattern space and finally realize the flow pattern recognition. The adopted rough set theory fuses image texture information and shape information, improves the recognition precision of a classifier, simultaneously reduces the training time, and can roundly reflect the characteristics of flow pattern image; the dependent degree and the generalization capacity of the flow pattern recognition method of the support vector machine for the sample data are better than the BP neural network; the invention has the shorter training time, and is applied to the flow pattern online recognition.
Owner:NORTHEAST DIANLI UNIVERSITY

Image deformation calibration method irrespective with shooting apparatus

The invention discloses an image distortion standardization method which is not related to a photo equipment. The method has following steps as: a straight goal line is selected in the image of a photo to be standardized; a starting point A, a midpoint B and an end-point C are respectively selected out on the goal line; the photo coordinates of three pixels (xA, yA), (xB, yB), (xC, yC) are measured, by which a distortion type is calculated. An enough large radius vector delta rb is given to the midpoint B to make the three corrected points A', B' and C' have the opposite distortion type. An assumed image distortion factor is calculated according to the assumed distortion radius vector. According to the assumed image distortion factor, the radius vectors of the three positions A', B' and C' of the three points A, B and C after the distortion is eliminated are calculated. The pixel coordinates of the three positions A', B' and C' after the assumed image distortion is eliminated are calculated. By utilizing a split-middle method, an iterative approach computation is made to get the image distortion factor k1. The method of the invention takes a digital image as a standardization target, breaks away from a camera to calibrate the distortion factor of the digital image (including the historical image and the image in a network transmission, etc.) obtained in various channels.
Owner:常熟紫金知识产权服务有限公司

Dental X-ray three-dimensional filming system and three-dimensional imaging method

The invention discloses a dental X-ray three-dimensional imaging system and a corresponding three-dimensional imaging method, and aims at reconstructing a three-dimensional dental model image from a two-dimensional panorama dental X-ray image. The system comprises a host gantry frame, an X-ray generator head, an X-ray detector, a laser positioning device, an attaching sign, a chair, a chair riser, a chair rotating device, an image processing computer and an operation and display panel. The method comprises: (1) teeth are carried out with panoramic X-ray imaging by rotating the chair; (2) pre-imaging process is carried out with the image processing computer; and (3) the three-dimensional image is reconstructed with the image processing computer. The system and the method take a digital panoramic camera regularly used in dental operation as the main part to realize the optimal cone-typed beam three-dimensional image reconstruction by integrating the optical laser positioning device. The system is characterized by high safety and precision, convenient operation, clear and fine picture, good practicability and durability, etc.
Owner:王乔生

Adjustable photo-optics palm print image acquisition equipment

The invention provides an adjustable optical photographing palm print image acquisition device which belongs to the optical photographing acquisition device. The device comprises a sealed box body which is divided into three layers, wherein the upper layer is for placing a palm, the middle layer is for placing a light source, a camera and a position adjusting mechanism of the light source and the camera, and the lower layer is for placing a power supply, a graphic acquisition card as well as electronic equipments like a light source brightness control regulating circuit, etc. A light source holder positioning plate is arranged between the middle layer and the lower layer, a plurality of light source holders perpendicular to the bottom surface of the box body are fixed on the light source holder positioning plate, each light source is a telescopic tube and is provided with a socket on the top end for assembling the light source. The invention provides a fully closed or half opened photographing environment, the number, position, angle and brightness of the light sources can be regulated independently, and the position of the camera can also be finely regulated, thereby obtaining high quality palm prints meeting various requirements.
Owner:PEKING UNIV

Touch screen man-machine interactive system based on laser projection

The invention relates to a touch screen man-machine interactive system based on laser projection. The existing touch system based on filament lamp light source projection technology and combined with infrared mapping basically realizes man-machine interaction on a large screen, but no touch system used for laser back projection exists currently; the touch screen man-machine interactive system solves the problems that the existing touch system has a complicated structure, is not bright in color, insufficient in brightness, short in the service life of a bulb, and needs an additional infrared source, and the like; the touch screen man-machine interactive system comprises a red, green and blue (RGB) color laser light source, a laser speckle restraining module, a projection display module, a time sequence control circuit, a lens, a minicam and a projection screen; the touch screen man-machine interactive system does not need an additional infrared source, has a simple structure, high stability and is light and small equipment applicable to the man-machine interaction in museums and home entertainment; and in addition, after the minicam is shutdown and the projection display module and the time sequence control circuit are adjusted, the touch screen man-machine interactive system can also be used for displaying general movies and videos, and has good compatibility.
Owner:YLX INC

Control system and method for camera device

The invention relates to a control system and method for a camera device. The method comprises the following steps: controlling a computer to obtain an image shot by a camera; utilizing an eyeball detecting technique to detect an eyeball area in the obtained image, comparing the detected eyeball area with a preset eyeball sample according to the height of the detected eyeball area and a coordinate value of an eyeball position, and obtaining a matched eyeball sample; and obtaining a preset control instruction corresponding to the matched eyeball sample and sending the control instruction to the camera device, thereby adjusting a shooting position of the camera device, a lens angle and a focal length. The control system can be utilized to automatically control the camera device to move on a track system according to the eyeball state and position change of a monitor.
Owner:WARECONN TECH SERVICE (TIANJIN) CO LTD
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