Portable digital image capturing and processing system employing an area-type image sensing array exposed to illumination produced from an LED-based illumination array and measured using a photodector operated independently from said area-type image sensing array
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United States of America Patent
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Mar 31, 2009
Grant Date -
Jun 21, 2007
app pub date -
Nov 27, 2006
filing date -
Nov 13, 2003
priority date (Note) -
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Abstract
A portable digital image capturing and processing system comprising an image formation and detection subsystem, an LED-based illumination subsystem, an automatic light exposure measurement subsystem, and an automatic illumination control subsystem. The image formation and detection subsystem has an area-type image sensing array for detecting digital images of objects formed thereon by image formation optics providing a field of view (FOV) for the system. The automatic light exposure measurement subsystem employs a photodetector operated independently from the area-type image sensing array, for automatically measuring the light exposure incident upon a selected portion of the FOV, and producing an electrical signal representative of the light exposure measurement. The automatic illumination control subsystem responds to the electrical signal and controls the duration of LED-based illumination produced from the LED-based illumination subsystem during the image capture mode.
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