| 摘要 |
Systems and techniques for improved focal range for image based bar code scanning. An image based bar code scanner includes an imaging device comprising a lens array of one or more fixed focus lenses, and an imaging element. The lens array and the imaging element are disposed so that an image, or image elements, of a bar code moving before the lens array is focused at different distances on different portions of the imaging element. Focused images or image elements are identified and captured, and these captured images are processed to extract bar code information.
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