Abstract
In order to get useful information for designing solid state image sensors and camera systems, two dimensional Nyquist limits and modulation transfer functions (MTFs) for solid state image sensors were studied by Fourier transformations of sampling lattices formed with regularly arrayed picture elements and by those for apertures forming an effective photo-sensitive area, respectively.
A rectangular lattice and a rhombohedral lattice were chosen to investigate two dimentional Nyquist limits. In case of 500V×400H pixels imager as of today, the Nyquist limit for the latter was improved about two times that for the former in a horizontal direction, while it decreased in diagonal directions.
A rectangular aperture and L-shaped aperture were examined to give two dimensional MFTs, which were broken down into area maps by drawing contour lines connecting equal MTF values. MTF values were found to increase in directions where the photo-sensitive areas were masked resulting decreased apertures.
