| 摘要 |
The image reading device has a pixel data reading processor, in which pixel data forming an image is read, and a histogram generating processor, in which a histogram representing a distribution of the pixel data is generated. The histogram is utilized when determining an optimum exposure time, for example. In the generation of the histogram by the histogram generating processor, not all of the pixel data are used. Namely, pixel data, from the maximum value through a first boundary value, and pixel data, from a second boundary value through the minimum value, are used. Since the pixel data, from the first boundary value through the second boundary value, are not utilized in generating the histogram, the capacity of the memory, in which the histogram is stored, can be reduced.
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