| 摘要 |
An apparatus for determining the cleanliness of the lens of a digital camera comprising means for recording an image through a lens, means for storing a reference image in a memory, means for comparing the recorded image with the reference image, means for determining the degree of variation of the recorded image from the reference image from the comparison; and means for providing an audio or visual indication that the lens requires cleaning in dependence on the result of the determination. In a separate embodiment, first and second images are recorded and the degree of matching between the images is used for determination. The figure shows the invention when set up to take a comparison photograph.
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