A Study of Spatial Offset Method in the Diagonal Direction for a Very High Resolution Pickup System

An experimental 2, 000-line image pick-up system using the four-imager pick-up method is studied with the aim of developing an ultrahigh-definition image pick-up system that surpasses a high-definition system. Using existing high-definition pick-up elements and lenses, a 2, 000-line image pick-up experimental system with improved vertical resolution has already been developed In this development, the pixels are offset diagonally between the image pick-up elements of two imagers to make the four-imager pick-up method used to improve resolution even more efficient. In addition, a technique where by spatial sample points are taken to be quincunx samples is studied in an effort to improve horizontal and vertical resolution. In this paper, we report on our investigations into achieving greater horizontal and vertical resolution by offsetting pixels diagonally using HDTV 2/3-inch 2M-pixel charge modulation devices (CMD) We also report on our success in achieving both a horizontal and vertical limiting resolution of more than 1300 TVL through image pick-up testing. In regard to the approach used to achieve ultrahigh-definition through the multi-imager method, comparisons were made between two-imager pixel offset high definition and simple multi-pixel high definition. We verified that there was no deterioration in S/N and sensitivity, and that there was a gain in dynamic range In addition, simulation showed a limitation resolution curve that included errors in the mounting position of the prisms for the two-imager pick-up elements. The relation between the limiting resolution point and mounting precision is also studied.