Patent ID: 7081610

Claim:
A system, comprising: a sensor having a first and second array of photosensitive devices, the sensor receiving a beam of radiation; a storage device coupled to the sensor that receives signals from the sensor based on the received beam of radiation; and a processing system coupled to the storage device, wherein the processing system determines a first dark current value based on signals accessed from the storage device corresponding to signals from the first and second array of photosensitive devices during a first time period; the processing system determines an optical energy value based on signals accessed from the storage device corresponding to signals from the first array of photosensitive devices during a second time period; the processing system determines a second dark current value based on signals accessed from the storage device corresponding to signals from the second array of photosensitive devices during the second time period; and the processing system adjusts the optical energy value based on the first and second dark current values.