Sheng Qinghua

The data coupler design in transmission technology based on coaxial cable

Chinapsilas scientific research and scientific research device of ocean especially deep-ocean has developed rapidly during recent years. But till now research device and monitoring system are power supplied by underwater lithium batteries. Underwater lithium batteries powering method has many disadvantages and constrains the development of deep-sea scientific research. So a new mixed transmission technology based on the armored coaxial cable PLC (power line carrier) is proposed. This new technology can transfer direct-current high power source, real-time color image and data of both host and slave at the same time. This technology made the superposition of direct-current power source and SHDSL data signal mainly by capacitance coupling and low-frequency filtering. It adopts coaxial cable as the media for the data signal and power signal mixture transmission. Thus the goal of high-speed and long-distance transmission can be achieved.

Dynamic gesture recognition algorithm in human computer interaction

Human computer interaction (HCI) is a classic topic, and hand gesture is one of the most natural languages, so the key point in human computer interaction is hand gesture recognition. A skin color model based on Hue is utilized to detect skin color regions like hands. To distinguish the face and hand, a simple and fast hand segmentation algorithm is developed. Moreover, we use the least square method to fit the trajectory of hand gravity motion and the angle and direction of the movement is got by the inverse trigonometric function of the slope of the fitted line. Ten people doing 80 hand gestures in low and high illumination environment are tested. Experimental results show that the accuracy is 94.375% in average and the processing time is 34ms per frame. These demonstrated the good real-time and robustness of the proposed approach.