Patent ID: 9082029
Filing Date: 2015-07-14
Classification: G06K

Abstract:
1. A method of operating an optical code scanner to increase the depth of field for reading optical codes without moving optical elements, the method implemented by a digital processor within the optical code scanner, the method comprising: causing a plurality of illumination devices to emit a first narrow band of light directed to a scanning area of the optical code scanner for a first time period; capturing an image of the scanning area during the first time period wherein the image passes through a high dispersion optical lens before being captured; causing a plurality of illumination devices to emit a second narrow band of light directed to the scanning area of the optical code scanner for a second time period wherein the second narrow band of light is at a wavelength different from the first narrow band of light; capturing an image of the scanning area during the second time period wherein the image passes through the high dispersion optical lens before being captured; processing the captured images to decode an optical code; causing a plurality of illumination devices to emit a third narrow band of light directed to the scanning area of the optical code scanner for a third time period wherein the third narrow band of light is at a wavelength different from the first and second narrow band of light; and capturing an image of the scanning area during the third time period wherein the image passes through the high dispersion optical lens before being captured.