Wavefront Coding

Optimum phase amplitudeα optimum≈ W 20 (max)2β optimum≈ 0α optimum≈ W 20 (max)5β = −3α• So for minimum error in image when W 20 (max)=5λ optimumα is ~2.5λ • Compare previous reports α~15λ• A 6-fold reduction in α ⇒SNR increased by ~3 • But some variation in PSF so kernel should be optimised19