Camera-based imaging devices, having alternating clusters of light sources, facilitated to eliminate hot spots

A method for imaging a document, comprising the steps of:

• (a) providing an imaging device including:
• i. an enclosed imaging-optical-chamber;
• ii. a processor;
• iii. at least one camera mounted inside said imaging-optical-chamber, wherein said camera is configured to acquire image frames of at least a portion of the document;
• iv. at least two clusters of light sources, disposed inside said enclosed imaging-optical-chamber, for directly illuminating said portion of the document being imaged;
• and
• v. a glass-window, wherein the document is operatively disposed on the external surface of said glass-window,
• wherein said clusters of light sources are preconfigured to alternately operate;
• and
• wherein said camera is preconfigured to acquire an image frame of said portion of the document being imaged operatively coupled with the activation of each of said clusters of light sources;
• (b) alternately, for all of said clusters of light sources, perform the following steps:
• i. activating a first cluster of said clusters of light sources to directly illuminating the document being imaged;
• ii. acquiring an image frame of at least a portion of the document;
• iii. deactivating said first cluster of light sources;
• and
• iv. discarding a preconfigured portion of said acquired image frame, thereby forming a clean portion of said acquired image frame;
• and
• (c) combining said clean portions of said acquired image frame portions to form an output image frame of said portion of the document.