Patent ID: 9584750
Date: 2017-02-28
CPC Classifications: G01J,H04N

Claim:
1. A method for adaptive adjustment of operating biases of photodetectors of an imaging system comprising a shutter, an array of photodetectors, and detector electronic circuitry for reading out image data from the array of photodetectors, the method comprising: acquiring, with the shutter closed to occlude the array of photodetectors, image data from the array of photodetectors during a first time period, the image data comprising an array of pixel values; adjusting operating bias points for individual pixels, wherein an adjusted operating bias point for an individual pixel is configured to adjust image data acquired with the shutter closed so that a pixel value from the individual pixel is within a threshold range around a data value assigned to a reference bias point; acquiring, with the shutter open to expose the array of photodetectors, image data of a scene at a time after the first time period, the image data acquired using the adjusted operating bias points; acquiring, with the shutter closed to occlude the array of photodetectors, image data from the array of photodetectors during a second time period after the first time period, the image data comprising an array of pixel values; re-adjusting the operating bias points for one or more individual pixels with pixel values outside the threshold range, and not re-adjusting the operating bias points for one or more individual pixels with pixel values not equal to the reference bias point but within the threshold range, wherein a re-adjusted operating bias point for an individual pixel is configured to adjust image data acquired with the shutter closed so that a pixel value from the individual pixel is within the threshold range around the data value assigned to the reference bias point; and acquiring, with the shutter open to expose the array of photodetectors, image data of a scene at a time later after the second time period, the image data acquired using the re-adjusted operating bias points.