1. An electronic device comprising: a finger biometric sensor comprising an array of electric field sensing pixels; a dielectric layer over the array of electric field sensing pixels and having a non-uniform thickness; image data output circuitry coupled to the finger biometric sensor; and deblurring circuitry coupled to the image data output circuitry and capable of storing a plurality of deblurring coefficients for a deblurring function, the plurality of deblurring coefficients being associated with the non-uniform thickness of the dielectric layer, and processing image data to produce processed image data in accordance with the deblurring function to account for variations of thickness across the dielectric layer.