Abstract: The invention provides a sensor system (800) for generating a sensor signal (Sout) corresponding to a filtered image of a scene. The system (800) incorporates a multielement array (526) and associated processing circuits for providing element signals in response to images projected onto it and a projecting lens assembly (502) for projecting images onto the array (526). The lens assembly (502) projects differently blurred images of the scene onto the array (526) for generating a measurement signal during a measurement phase and a local spatial average correction signal during a calibration phase. A light-diffusing shutter (522) is used for generating the differently blurred images. The system (800) substracts the measurement and correction signals of each element from one another to provide a difference signal and uses this signal to generate the sensor signal (Sout) during the measurement phase.

Abstract: The invention provides a sensor apparatus (200) with compensated signal processing for generating a sensor signal corresponding to a filtered image of a scene. The apparatus (200) incorporates a multielement array (52) for providing at each element (58) first and second signals in response to first and second scene images projected onto it and a lens assembly (204) for projecting the images onto the array (52). Each element (58) is connected to an associated circuit (300). Each circuit (300) performs a subtraction of the first and second signals of its associated element from one another to provide a difference signal and supply this signal for use in generating the sensor signal. Each circuit (300) incorporates a transistor (T17) for injecting charge to compensate at least partially for subtraction accuracy degrading parasitic charge injection occurring within the circuit (300) when the apparatus (200) switches between projecting the first image and the second image onto the array (52).