A 4 K X 2 K-Pixel Color Image Pickup System

摘要

We have developed an experimental 4 K x 2 K pixel progressive scan color camera system. This new camera system has a data rate of 297MHz pixel/sec and 60 frame/sec and we are sure that horizontal and vertical limiting resolution of 1500TVL (TV lines) can be achieved on a color monitor. In- stead of the previous approach of improving resolution simply by increasing the pixel count in a imager, a novel four-sensor pickup method with 2/3 inch 2 million pixel CMD (Charge Modulation Device) imagers is used in this system. These sensors have 1920 (H) x 1035 (V) pixels within a 16:9 wide aspect image area and are successfully driven at 148 M pixel/sec in the progressive scan mode. In the four-sensor pickup method, two sensors are used for green and the rest are for red and blue. A spatial offset imaging method in the diagonal direction was applied to the two green sensors to improve the horizontal and vertical resolution effec- tively. The horizontal and vertical resolution of the red and blue signals become half that of the green signal, because only one 2M-pixel imager is used for each signal. The resolution of this system, however, is not degraded so much because the luminance signal is mainly composed of green signals.