278results about How to "No flicker" patented technology

The invention provides a tiled display control system based on a cloud computing technology, an image display method adopting the system and an application of the system. The system comprises a plurality of displays, a plurality of distributed cloud registration controllers, a plurality of exchangers and system software, wherein a jointing wall is formed by the plurality of displays; an LAN (Local Area Network) is formed by cascading the plurality of exchangers, and a framework core of an IP (Internet Protocol) network is formed by a transmission channel for providing data and control commands; the plurality of distributed cloud registration controllers are accessed into the exchangers of the corresponding levels, and are connected with the corresponding displays through video connecting wires, and the cloud registration controller adopts a PCI-E (PCI Express) base-plate and is provided with an Inter processor. A plurality of data (IE) windows can be displayed on an assembled display simultaneously by adopting the performance of a flexibly configured server and an output channel of the system, and can be interacted in real time; furthermore, the tiled display control system has the functions of video decoding, server memory and the like after the system is applied to a video conference system; compared with the traditional scheme, the system has the advantages of high performance, high reliability, high development, low cost, information processing, strong analysis and management capacities, high resolution ratio, high performance cost ratio, real-time display, green environmental protection and the like.

The invention discloses an application program starting control method and device. Starting of an application program locked by safety software is controlled by means of system service used for processing safety service in a system framework layer. The method includes the steps that after the safety service monitors a command to start the application program, the safety software in an application program layer is called; the safety software executes a user authentication and verification process on the basis of a starting event; the system framework layer determines to start or lock the application program according to a user authentication result. Due to the facts that the application program is not started directly and the safety software is called back, the application program can be started only when user authentication is successful, and the application program is locked when authentication fails, so that the problem that the application program flashes due to the fact that the application program is started firstly and then the safety software is used for locking the application program is avoided, and the problem that CUP time is wasted in timed training in rotation is avoided.

The invention discloses an online examination method, device and system. The online examination method includes: acquiring examinee login information of examinees; finding examination paper types corresponding to the examinee login information according to the same; finding target examination paper pointed by the examination paper types from a examination paper set, and sending the target examination paper to examination terminals of the examinees, wherein the examination paper of various examination paper types is stored in the examination paper set, and examination questions in the examination paper of each examination paper type are configured by examiners having corresponding question compiling login information. By the online examination method, device and system, universality and convenience of examination are realized.

The invention discloses a refreshing method of an electronic ink screen. A monitor is added to a drawing device of the electronic ink screen for monitoring the frame drawing updating frequency of all the electronic ink screen; when the updating frequency is higher than a threshold, the monitor emits a global notification to enable a refreshing manger to refresh the electronic ink screen by use of a refresh mode; and when the updating frequency is lower than a threshold, the monitor emits the global notification to enable the refreshing manager to refresh the electronic ink screen by use of a second refresh mode. Whether two preset refresh modes need to be converted is flexibly determined according to the frame drawing updating frequency of the electronic ink screen in the application process of a user. When a static image is watched for long time, a system determines that replacement of a refreshing mode is unnecessary and an original refreshing mode is always maintained. In case of animations or other images with quite high local refreshing frequencies, the system automatically converts the original refreshing mode into the first refreshing mode, high-frequency refreshing is automatically started, and the influence exerted by a ghost image on reading of the user is reduced.

Disclosed in the invention is a method for filling a cavity in a Kinect depth image in real time. The method comprises the following steps: step 1, obtaining a color image of a shooting scene and a corresponding depth image by using a Kinect camera and determining a foreground image position and a background image position by using an operating-period Gauss average method and a background differencing method; step 2, constructing a deepest image by using a Kinect depth image and filling a cavity in the deepest image; step 3, replacing the pixel of the deepest image with a background pixel of the depth image, thereby realizing cavity filling of the depth image background; and step 4, with the foreground image position obtained by the step 1, marking the cavity existed in the foreground position of the Kinect depth image and filling the marked cavity in real time. According to the invention, the object edge in the depth video with the filled cavity becomes stable; and the no flicker phenomenon occurs in the depth video. Meanwhile, the cavity filling speed in the depth image and the image stability can be improved effectively.

The invention discloses an LED (light-emitting diode) operating lamp adjusting the size and the shape of a lighting facula. The operating lamp is composed of a main lighting light source and an auxiliary lighting light source, wherein the two part light sources are realized through an LED array, the main lighting light source is divided into six regions which are respectively defined as W0,W1,W2,W3,W4 and W5; the auxiliary lighting light source is divided into two regions which are respectively defined as V1 and V2, each region is internally provided with a group of LED monomers, whether each group of LED monomers is lightened is controlled by a singlechip through a relay, and combinations of different regions form different sizes and shapes of irradiation faculae; and the main lighting light source and the auxiliary lighting light source also can realize adjustment of the lighting angle of a light source respectively through an angle adjusting mechanism, and the LED operating lamp realizes the control of switching-on and switching-off of a power switch, the size and shape of the main lighting or auxiliary lighting faculae size and the lighting angle through a key state on the control panel. Users adjust the required lighting effects through a control button according to the real lighting field requirement.

The invention provides an LED lamp bar drive circuit and a dimming method thereof, a backlight module and a display device, belongs to the technical field of display, and can solve the problem that existing PWM dimming can cause flickering or noise easily. The LED lamp bar drive circuit comprises a power supply unit for providing voltage for each branch of LED lamps, a current detection unit for detecting average value of total current input to LED lamp bars, and a control unit for controlling the LED lamps on each branch to be turned on/off according to the detection result of the current detection unit. The brightness of the LED lamp bars can be adjusted by controlling the on/off state of the lamps on the corresponding branch. The dimming method is high in efficiency, low in noise, and wider in dimming range. The LED lamp bar drive circuit is suitable for adjusting the brightness of various types of backlight modules.

The invention is suitable for the field of driving of a LED and provides a pulse modulation control method and a pulse modulation control device for driving the LED. In the invention, according to received address information, gray level data of an LED lamp bank corresponding to the address information is acquired; then a pulse modulation signal or a plurality of pulse modulation signals with the same or special duty ratio are generated in a pulse modulation period according to preset parameters by combining the gray level data; and one pulse modulation signal is stored in a first preset storage space or a plurality of pulse modulation signals with the same or special duty ratio are stored in the first preset storage space to form a plurality of continuous pulse modulation signals with periodicity, so that the brightness of the LED in the working process is ensured to be changed smoothly without the phenomenon of blink or nonuniform brightness, and thus, the problems of blink and nonuniform brightness when the LED light-emitting device works, which are caused by a pulse modulation mode provided in the prior art, are solved.

The invention relates to the field of tunnel engineering, in particular to a method for laying a tunnel portal strengthened illuminating system. The method is characterized in that a plurality of illuminating devices are arranged in an entrance section and an exit section, and the illuminating devices arranged in the entrance section or the exit section are distributed in a thinning mode from a tunnel portal to a distribution area in a tunnel, namely the illumination level is reduced gradually from the tunnel portal to the inside of the tunnel. The method for laying the tunnel portal strengthened illuminating system has the advantages that the laying scheme is acquired by setting up a testing shed in the site to analyze, compare and select data of a plurality of schemes, and light guides are arranged in the entrance section and the exist section of the tunnel by the laying scheme to replace high strength gas-discharge light sources, so that the gentle transition of the illumination levels on road surfaces inside and outside the tunnel is realized, and the zero electric energy loss of tunnel strengthened illumination is realized.

The invention discloses a high-resolution auto-stereoscopic display which is composed of a switching grating and a flat-panel display screen. The flat-panel display screen can be an LCD, a PDP, an LED or other equipment with a point-to-point image display function. The flat-panel display screen has high refresh frequency and can refresh an image at a frequency which is N times the base frequency under the control of a frequency-doubling player. A synchronizer controls the switching grating to carry out state switching which is synchronous with refreshing of the flat-panel display screen. Each frame of high-resolution stereoscopic synthetic image output by the frequency-doubling player is decomposed into N full-resolution sub images which are sequentially refreshed and displayed in a point-to-point manner in a basic refresh period, and the N sub images can be combined into an image with N-time definition under the action of the switching grating. The high-resolution auto-stereoscopic display has the outstanding advantage that large-viewing-angle and high-definition naked-eye stereoscopic display can be realized.