| 摘要 |
Two or more CCD imagers (12, 14), which have random defects are optically coupled to form a single image. The CCD's are in registry. Because of the random nature of the location of the defects, the defective photosensors of one imager (12) are aligned with good photosensors of another (14). Memories (34, 36) keep track of which locations of which CCD are defective. The imagers (12, 14) are operated synchronously and the signals from good photosensor locations are summed for improved signal-to-noise ratio. When a location is addressed at which one imager (12) has a defective photosensor, the respective memory (34) decouples it from the good photosensor of the other imager (14). The signal level is restored for that location by increasing the gain of a preamp (46) by the correct amount. If the imagers (12, 14) are made from the same mask, they may have almost identically corresponding defective photosensors. Then one imager (12) is mounted upside-down relative to the other (14) and scanned backwards so the defects do not coincide. |
