(a) The maximum peak-to-valley value and root mean square of the measurable wavefronts of ASM-SHWS in terms of Zernike terms. (b) Spot matching results of ASM-SHWS with different degrees of missing spots: missing 10% (left), 30% (middle) and 50% (right) in the random region. The spots are connected to the corresponding microlens by white lines.