| 摘要 |
<p>A guide light (G) indicating a rectangular reading portion, smaller than an imaging visual field (F) of an area sensor, is irradiated on a reading objective. A control unit, under the irradiated guide light (G), causes the area sensor to capture a first image. Then, the control unit detects the position of the guide light (G) based on captured first image data. Then, with no irradiation of the guide light (G), the control unit causes the area sensor to capture a second image. The control unit then estimates an existing region of a two-dimensional code in the second image. The control unit selects, as a processing objective, only a code that is completely contained in the reading portion and executes the decode processing only for the selected code. When failed in a reading operation, the control unit expands a processing objective region and executes the decode processing again.</p> |
