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An analytical parameters tuning method of PIλ controllers is discussed with exact phase margin and robustness against the gain variations of the controlled plants. According to the definitions of phase margin and the robustness to the gain changes of the controlled plant at gain cross over frequency, three nonlinear equations containing the three tuning parameters of PIλ controller are obtained and...
In this paper we use L1 adaptive controller to augment a baseline for improved command tracking of the unmanned aerial vehicle. The procedure included baseline and adaptive augmentation controllers design. The eigenstructure assignment (EA) controller was designed for the nominal case, and then was augmented with a L1 adaptive controller. The L1 adaptive control methodology offered an adaptive contributor...
In this paper, we propose a fast and accurate video retrieval algorithm using random projections, an indexing structure and parallel computing. The video sequences are represented by low dimensional temporal trajectories in a set of low dimensional spaces through scaling and random projections. A kd-tree structure is used for efficient data access. We also develop an efficient retrieval algorithm...
With the phenomenal growth of the online and personal video repositories, an efficient and robust example-based video search solution is required to support applications like query by clip, query by capture, and repeated clip detection. In this letter, video sequences are represented as temporal trajectories via scaling and lower dimensional representation of the video frame luminance field, and a...
In order to more accurately evaluate a robust image watermarking scheme, formulas of calculating capacity and robustness of the scheme are proposed in this paper. Firstly, non-blind robust image watermarking scheme is discussed. Based on the scheme model built in spatial domain, the formulas of calculating capacity and robustnessare drawn in detail. Then the models and capacity and robustness formulas...
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