Methodology for design of antialiasing filters for autostereoscopic displays

Abstract

Multi-view autostereoscopic displays can be modelled as a multirate system. The design of such displays involves a construction compromise between the amount of different views and the spatial resolution of each view. Images to be visualised on these displays are prone to aliasing errors. Careful antialiasing requires knowledge about the display frequency response, which is determined mainly by the view sub-sampling topology but it is also influenced by some other, generally non-linear, aliasing-causing display effects. In this work, a methodology for designing antialiasing filters for autostereoscopic displays is proposed. It includes the following three steps: (i) measuring aliasing effects by a set of test images – displayed on the screen, then photographed and then analysed in Fourier domain; (ii) estimating the display passband based on the set of measurements and (iii) designing filters confined to the so-estimated band. Using this methodology, one non-separable and three separable antialiasing filters have been designed. The non-separable filter cancels the aliasing terms completely, whereas the separable approximations allow for some small amount of aliasing for the sake of perceptually favoured sharpness preservation. The advantage of the methodology with respect to previously suggested antialiasing filter design approaches is demonstrated by objective comparisons of filter performance and computational efficiency and by visual inspection on a set of test images.