A Video Watermarking Algorithm Based on 1D DFT and Radon Transform
A new video watermarking algorithm based on the 1D DFT (one-dimensional discrete Fourier transform) and Radon transform was proposed in this paper. The 1D DFT for a video sequence generates an ideal domain. The frames with highest frequency were chosen to embed the watermark in the Radon transform domain. The performance of the proposed algorithm is evaluated by video compression standard H.264 with three different bit rates; geometric attacks such as rotation, translation, and aspectratio; and other attacks like frame drop, frame swap, spatial filtering, noise addition, lighting were conducted. The results show that the algorithm is robust to the attack. One of the most important advantages of this video watermarking algorithm is its simplicity and practicality.
The Control Strategy of Obstacle Avoidance forMobile Robot in Unknown Environment
This paper presents a control strategy of obstacle avoidance for nonfully constrainedmobilerobots in unknown environment.The avoidance of unexpected obstacles is consideredin a reactive way by following the contour of the obstacles.The robot backwardsmotions are avoided and the robot heading is always in the direction of thegoal point facilitating the obstacle handling. The stability of obstacle avoidance is analyzed under the reasonable conditions. Finally, the goodperformance and the feasibility of this approach are shown through several experimental results.
Optimal Method of Lot Sizing Disassembly with Multi-Resource Constraints
Disassembly modeling and planning are meaningful for the reuse and recycling of obsolete and discarded products. However, the existing disassembly methods pay little or no attention to impact of resources constraints for disassembly problem. According to the characteristics of lot sizing disassembly optimization problem with multiresource constraints, a mathematical model was established to solve disassembly optimization problems with multi-resource capacity constraints. The model aims at maximizing the profit of disassembly. The CPLEX software is used to solve the model. In order to approve the effectiveness of the proposed model, several randomly generated problem instances are used, the experimental results approved the effectiveness of the proposed model for the lot sizing disassembly optimization problem.
Research and Application of Digital Archives in IP Network Design Method
n view of the digital archives of IP network encountered problems in the design process, this paper puts forward a design method of IP network in the design of digital archives based on the campus network, with the consideration of the overall planning, route planning, capacity design, equipment design, design for reliability, scalability design, and business planning of digital archives of the campus network. The designed network in this paper has been applied on the construction of College Party school digital archives of IP network, and the network performance has been tested. The results showed that the performance of the network could meet the new business development needs of party school of university digital archives.