| 摘要 |
A line sensor captures, under predetermined and initialized exposure, at least one of the first negative base area before the first laboratory reserved area, the second negative base area just behind the first laboratory reserved area, the third negative base area just before the second reserved area, and the fourth negative base area behind the second reserved area, and then R, G and B output voltages output from the line sensor are measured. Next, the gain of each of analog amplifiers, or the gain of each of the analog amplifiers and the exposure time of the line sensor are controlled such that each maximum value of the measured R, G and B output voltages corresponds to a predetermined reference voltage. An image of each frame is captured based on the exposure control. Thus, the exposure can be controlled correctly, and a frame image can be captured properly.
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