Random matching pursuit for image watermarking by Hua, Guang, Zhao, Lifan, Zhang, Haijian, Bi, Guoan, Xiang, Yong

“…The classical solution to an underdetermined system of linear equations mainly has two opposite directions, which lead to either a large ℓ 2 -norm sparse solution or a non-sparse minimum ℓ 2 -norm solution. …”
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When Compressive Sensing Meets Data Hiding by Hua, Guang, Xiang, Yong, Bi, Guoan

“…Unlike the conventional orthonormal full-space dictionary, the over-complete dictionary produces an underdetermined system with infinite transform results. We first discuss the minimum norm formulation (ℓ2-norm) which yields a closed-form solution and the concept of watermark projection, so that higher embedding capacity and an additional privacy preserving feature can be obtained. …”
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QuadPlus : design, modeling, and receding horizon-based control of a hyperdynamic quadrotor by Singh, Karanjot, Mehndiratta, Mohit, Feroskhan, Mir

“…Moreover, a novel cascade approach comprising of a high-level nonlinear model predictive control (NMPC) algorithm is adopted to obtain the optimal actuator configuration for an underdetermined system while dealing with the physical constraints. …”
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