Optimization of wavefront coding imaging system based on the phase transfer function

The variation of the phase transfer function with respect to defocus causes linear image shift and image artifacts on the restored images in wavefront coding imaging system with asymmetrical phase masks. To reduce the effect of the phase transfer function on the restored image according to the signal to noise ratio, in this paper, an optimization function based on the phase transfer function is proposed. By using this function with the signal to noise ratio equal to 30 dB, optimization and simulation result for the cubic phase mask and the tangent phase mask are presented. The simulation result shows that the tangent phase mask produces more benefit to reduce image artifacts on the restored image.