| 摘要 |
Provided is an automatic focusing apparatus which comprises a photographing unit for photographing a transmitted light generated by applying a light to an observation target from a light source, an index value operation unit for performing operation to obtain an index value indicating focus information of the observation target from the image data outputted from the photographing unit, and a focus controller for controlling a focus of the photographing unit so as to obtain an optimal focus position for the observation target on the basis of the index value, and uses a threshold value obtained from a background color of the image data to discriminate between the observation target and dusts, thereby enabling proper automatic focusing to be made for the target to observed even from the image data having the observation target and dusts mixed.
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