Simply denoise: wavefield reconstruction via jittered undersampling

Regular undersampling ($\xi =0$ ):

As observed from the first row of Figure 3, there is no jitter in this case and equation 6 becomes

$$\ensuremath{\mathbf{a}}[k] = \left\{ \begin{array}{cl} n, & \mbox... ...ext{with}\quad l=0,\cdots,\gamma-1\\ 0, & \text{otherwise}. \end{array} \right.$$ (7)

The undersampling artifacts $\ensuremath{\mathbf{z}}$ consist of aliased energy.