Conventional integral imaging systems utilize lenslet arrays with fixed focal lengths and aperture sizes. A time-multiplexing method, called a moving array-lens technique, improves the viewing resolution
because the Nyquist sampling resolution limit imposed by a periodic lenslet array can be overcome. In the moving array-lenslet technique, if lenslet arrays with a low fill factor are used, the viewing angle can also be improved without degrading the viewing resoluton
seriously. We show that the product of depth and resolution square
of the displayed three-dimensional image is limited by the inverse of the illumination wavelength in conventional integral imaging systems. This means that the longitudinal depth of three-dimensional images can be improved only by sacrificing the resolution. Therefore, to enhance both the longitudinal depth and the resolution of a
three-dimensional image, we discuss the use of an array of lenslets with different focal lengths and aperture sizes. The required lenslet parameters for our method are calculated. Our theoretical analysis indicates that significant improvements in longitudinal depth and resolution can be obtained using the nonuniform lenslet array and the time-multiplexing technique.© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.