Patent ID: 9195899
Filing Date: 2015-11-24
Classification: G06K,G06T,H04N

Abstract:
1. A method for monitoring the state of calibration of a digital x-ray detector, the detector comprising a solid state sensor with a plurality of pixels, a scintillating screen and at least one embedded microprocessor, the method comprising using a signal processing device, comprising: setting a calibration operating mode of the detector including setting a voltage bias of the plurality of pixels at a first voltage level; capturing a plurality of dark images in the calibration mode while maintaining the voltage bias of the plurality of pixels at the first voltage level; resetting the voltage bias to a second voltage level different from the first voltage level only after the step of capturing the plurality of dark images; determining a dark difference image between two captured dark images that were captured last in time of the captured plurality of dark images; and identifying defective pixels in the dark difference image that differ by over at least one preselected threshold deviation amount from other pixels in the dark difference image.