| 摘要 |
<p>Provided is an image reading apparatus and method which may read images beyond the maximum depth of focus without substantial image deterioration. The image reading apparatus includes a light source unit radiating light to a scan region of a scan object placed on a transparent plate, an image sensor converting a light signal obtained by reading the scan region of the scan object into an electric signal, a focus state detecting unit detecting a focus state of the scan object, and a wavefront coding unit. The wavefront coding unit modulates a wavefront of the light reflected from the scan region of the scan object in order to input light that is made insensitive to defocus to the image sensor. This is done when it is determined by the focus state detection unit that the light is radiated to the scan object in an improper focus state on the scan object.</p> |
