Patent ID: 8681399
Filing Date: 2014-03-25
Classification: H04N

Abstract:
1. A method for scanning a document, comprising: illuminating at least a portion of a document with a light source, the light source configured to be modulated at a modulation rate including an on-time and an off-time each cycle; determining an initial first velocity of the document relative to a scan bar, the scan bar including an array of image sensors for digitally reproducing the document as a sequence of scan-line rows; determining first modulation rate of the light source based at least in part on the first velocity of the document relative to the scan bar, the on-time of the first modulation rate selected to obtain a first exposure level of each scan-line row at the first velocity; modulating the light source at the first modulation rate; and the array of image sensors capturing sequential scan-line rows of image data at a predetermined linear resolution using light emitted at the first modulation rate by the light source.