| 摘要 |
An image sensor captures an observation image formed on a light-receiving surface. An order adjustment unit makes the image sensor capture an original entire-area image being a picture of the observation image for an entire area of the light-receiving surface under a first exposure condition, and makes the image sensor capture a partial-area image being a picture of the observation image for only a partial area of the light-receiving surface under a second exposure condition. A synthesizing unit synthesizes the original entire-area image and the partial-area image to obtain an entire-area image having a wider dynamic range than the original entire-area image.
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