Patent ID: 7644865
Filing Date: 2010-01-12
Classification: G06K

Abstract:
1. A reader for electro-optically reading indicia located in a range of working distances relative to the reader, comprising: a housing having a window; a solid-state imager in the housing and including an array of image sensors for capturing light through the window from the indicia over a field of view during the reading; range control means for varying the range of working distances in which the indicia are read, wherein the range control means includes means for measuring a size characteristic of the indicia, and is operative for reducing the range of working distances when the size measured by the measuring means is below a predetermined range of reference sizes; and wherein the indicia is a bar code symbol comprised of bars and spaces having widths as considered along a scan direction lengthwise of the symbol, and wherein the measuring means is operative for measuring the width of at least one bar in an image by counting number of pixels in the image of the at least one bar.