Led illumination uniformity

A method for adjusting LED light uniformity in an LED array, comprising:

• dividing the LED array into a plurality of different LED banks, wherein a light output of each one of the plurality of different banks of LEDs is independently adjustable, wherein the LED light illumination profile is substantially symmetrical around a center, or a point, of the LED array and each one of the plurality of different banks of LEDs comprises a group of LEDs on opposite sides of the center, or the point, of the LED array;
• measuring, by a processor, the light output for each one of the plurality of different banks of LEDs;
• and
• adjusting, by the processor, the light output for one or more of the plurality of different banks of LEDs of the LED array to achieve a uniform LED light illumination profile at a sensor.

An input imaging system having a light emitting diode (LED) light illumination profile, comprising:

• an LED array, wherein the LED array is symmetrical around a center, or a point, of the LED array, wherein the LED array is divided into a plurality of different banks of LEDs, wherein each one of the plurality of different banks of LEDs comprises at least two groups of LEDs on opposite sides of the center of the LED array, wherein a light output of each one of the plurality of different banks of LEDs is independently adjustable;
• an electrical device for adjusting a current delivered to the each one of the banks of LEDs coupled to each one of the plurality of different banks of LEDs to adjust the light output to minimize a signal-to-noise ratio across an image area illuminated by the LED array to achieve a uniform LED light illumination profile;
• a diffuser coupled to the LED array to scatter the light output towards a document;
• a lens for collecting the light output that is reflected off of the document;
• and
• a charged coupled device (CCD) coupled to the lens to receive the light output that is collected by the lens.