CODE SYMBOL READING SYSTEM HAVING ADAPTIVE AUTOFOCUS

摘要

A system for reading code symbols includes an imaging subsystem that includes a focusing module and an image processor. The image processor selects an initial, predicted focal distance for the imaging subsystem's focusing module with respect to a code symbol. The focal distance for each successfully decoded code symbol is stored in memory, and a weighted average of a pre-selected number of memorized focal distances is used to calculate the next initial, predicted focal distance.

主权项

1. A system for reading code symbols, comprising:
an imaging subsystem for capturing images within the imaging subsystem's field of view, the imaging subsystem including a focusing module; and an image processor configured for selecting an initial, predicted focal distance for the imaging subsystem's focusing module; processing an image of a code symbol captured by the imaging subsystem in order to decode the code symbol; and storing in memory the focal distance associated with the decoded code symbol; wherein the image processor is configured to select the initial, predicted focal distance as a function of memorized focal distance(s) associated with previously decoded code symbol(s).