To resolve QoS problem in video conference system, a kind of architecture for video conference system was designed, which combined centralized signaling based on SIP with media transport based on P2P. In addition, an improved quantum genetic algorithm was used to solve the multipath routing selection problem. The method broke the shackles of the single-path transmission and adopted multipath transmission mechanism, not only avoiding the underlying network routing errors but effectively improving the reliability of the media transmission.
Object tracking has always been a hot issue in vision application, its application area include video surveillance, human-machine, virtual reality and so on. In this paper, we introduce the Mean shift tracking algorithm, which is a kind of important no parameters estimation method, then we evaluate the tracking performance of Mean shift algorithm on different video sequences.
The wireless video monitoring system contains the video acquisition device,video transmission device,video storage device and VGA display device.In this paper,we use video acquisition device to collect video siganals in real-time.The analog video signal is transmitted by using wireless technology.The video signal is converted to a digital signal by using the dedicated A/D chip. At the same time ,the YCrCb signals will be converted into RGB signals by the format converting module.Then,the digital RGB signals are converted to analog RGB signals through the D/A,and they are finally displayed on the VGA monitor in real-time.The design mainly uses the wireless transmission technology to transmit analog video signals and uses ADV7181 to decode.The controlling system of FPGA deals with the decoded digital signals which will be transmitted to the D/A and the data finally will display in real time.
The 3D meshes deformation is the deformation on 3D mesh models under users want, and keeping the mesh details at the same time. In this paper, we present a technique for multi-resolution meshes deformation based on the offset of sketching. In order to decrease the computational cost, the proposed method reduces the number of vertices involved in the deformation. First, we construct a simplified mesh using a modified CPM algorithm; and then correct Laplacian coordinates rotation by the offset of sketching and generate the deformed models by solving linear system in least squares sense with Gauss-Seidel algorithm; finally, series of details are added to the deformed simplified mesh. In contrast with the traditional deformation, our method can achieve natural deformed models more efficiently.
Organic light-emitting diode (OLED) has many advantages such as ultra light, ultra thin, high brightness, high definition, self-luminous, wide angle, quick response.It quickly attracts peoples attention to make one of today's hottest panel display subject. Based on the characteristics and working principle of OLED, the OLED display controlling circuit using the decoding module of DSP and controlling module of FPGA is designed.According to it,the use of each module in the circuit and the working process of the whole circuit are analysed.The simulations and tests are done.Verilog HDL is used to design the controlling circuit in the whole system and a top-down design method is used which is penetrated into each layer from top to bottom and devided carefully.The simulation results show that the gray scale display of OLED can be achieved and better display performance is obtained.
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