| 摘要 |
An independent pixel output line (14) is arranged for each of pixels arrange in a two-dimensional array in a pixel region so that pixel signals can be successively written into storage units (22) via the pixel output lines (14). When pixel signals of a plurality of frames are held in the storage units (22), pixel signals corresponding to two arbitrary frames are read out from the storage units (22) and held in sample hold circuit units (61, 62), respectively. A difference between the pixel signals is obtained. Difference signals corresponding to a predetermined image range are accumulated and compared to a threshold value. When the accumulated value exceeds the threshold value, it is considered that an object has changed and a pulse generation circuit (66) generates a trigger signal. According to the trigger signal, control may be performed to stop the imaging. Thus, it is possible to perform an accurate high-speed imaging before or after occurrence of a target phenomenon. |
