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Based on the teaching contents of unmanned aerial vehicle ( UAV) High t control and image processing in unmanned aerial vehicle remote sensing course, the paper designed and built a four rotor UAV teaching experimental platform based on photoelectric image processing. In order to achieve the autonomous Bight control of the quadrotor, an autonomous flight control hardware platform is designed in which a self-assembly aircraft is used as the body frame based on image processing and recognition. The main on-board sensor is attitude sensor MPU6050 and camera OV7725. An ARM microcontroller is used to construct the main control chip, R5F100LEA series chip is used as assistant chip. Based on the nonlinear dynamic model of the quadrotor, a single-loop P1D control algorithm and image processing and recognition are designed, this design realizes the self-assembly aircraft system which can fulfill specific task. Experimental results show that the on-board control system has achieved good flight performance and we finish the following task like following the line, picking and searching specific things with the corporation of two chips. [ABSTRACT FROM AUTHOR]

In order to solve the problem of weak covertness, small hiding capacity and poor robustness of Tibetan webpage information hiding (111) technique, a novel 1H scheme with synchronization mechanism for Tibetan web page ( 1HSTW ) is proposed. Firstly, the bit sequence of secret message is disordered by scrambling transformation algorithm. Then the synchronous Baker code is added into this scrambled bit sequence to form a new bit sequence. Lastly, the bit "0" and ' 1' of this new bit sequence is embedded into Tibetan webpage through changing the upper or lower case of tag attribute names in its HTML code. Experimental results show that, compared with other existing III methods, I11STW can increase the information hiding capacity effectively with good covertness and present better robustness under heavy random perturbation. [ABSTRACT FROM AUTHOR]