| 摘要 |
PURPOSE:To increase greatly the sensitivity by means of the solid state pickup device, by using the high-resolution puckup element for the luminance channel and then the element featuring the low resolution and high sensitivity for the chrominance channel each. CONSTITUTION:If the optical division ratio is changed from 25:75-50:50 between luminance channel Y and chrominance channel C for the isolating luminance system color TC camera which uses two units of the solid state pickup element, the double sensitivity is obtained in terms of channel Y. On the other hand, the optical division ratio must be set triple or more to secure the double sensitivity for channel C. In this connection, the scanning of channel C is carried out with every second scanning line. In other words, the scanning is carried out as I-1, I-2... in the 1st field II-1, II-2... in the 2nd field, III-1, III-2... in the 3rd field, and IV-1, IV-2... in the 4th field respective ly. In this case, the vertical resolution becomes 1/2, and the sensitivity becomes about double since the storage time features the double value. And no problem is caused in pratical use because the lowering of the resolution is limited to channel C. |
