| 摘要 |
A method which includes Steps 1 to 5 is provided. In Step 1, the location of a dark distribution is determined, and a dark distribution histogram ratio is calculated. Next, in Step 2, the location of a bright distribution is determined, and a high-brightness slice set value is set. In Step 3, a determination is made as to whether or not a subject is in a backlighted state. Here, backlight determining means determines that the subject is in a backlighted state when a dark_ratio falls within a range of from 0 dB to less than -6 dB, while it determines that the subject is in a backlighted state when the dark_ratio falls within a range of from -6 dB to -30 dB. The dark_ratio is explained in the section describing means for determining the location of the dark distribution and calculating the dark distribution histogram ratio. When the subject is not in a backlighted state, the high-brightness slice set value is used unchanged in Step 4. On the other hand, when the subject is in a backlighted state, the dark_ratio is normalized in Step 5, so that, for example, backlight correction is carried out so that a high-brightness component limiter value of an integration signal of a peak-value-detected output is decreased. Using this method, a proper determination is made as to whether or not a subject is in a backlighted state in order to perform a proper backlight correcting operation.
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