| 主权项 |
1. A method for offset correction in 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 at a first time, the image data comprising an array of pixel values; acquiring, with the shutter closed to occlude the array of photodetectors, image data from the array of photodetectors at a second time after the first time; determining an offset value function for individual pixels in the array of pixel values by fitting a function to the image data acquired at the first time and the image data acquired at the second time, the offset value function configured to estimate a flat field image data value for an individual pixel at a time later than the second time; acquiring, with the shutter open to expose the array of photodetectors, image data of a scene at a third time later than the second time; and adjusting the image data of the scene using the offset value function to estimate, for individual pixels, an offset value at the third time to correct for offset drift of the imaging system at the third time. |
