l。 Introduction o Imaging is to resolve an inverse problem nonlinear ill-posed problem 骣 CD 0,Dy+k2y=0 ☆ Methods Iteration regularization Direct imaging algorithm MUSIc (過两科学大季 A Direct Numerical Imaging Method 4 National University of Defense TechnologyA Direct Numerical Imaging Method 1. Introduction ❖ Imaging is to resolve an inverse problem ◆ nonlinear, ill-posed problem ❖ Methods ◆ Iteration + regularization ◆ Direct imaging algorithm (MUSIC) 4 2 2 2 1 0; v t y 骣ç ¶ ÷ çD - = ÷ ç ÷ ç桫 ÷ ¶ 2 D + = y y k 0