1. A method for verifying a fingertip touch input to a digitizer, the method comprising: obtaining a spatial pattern of signal amplitudes from input provided over a plurality of conductive lines of a digitizer sensor; detecting gradients within the spatial pattern of signal amplitudes; determining a number of conductive lines associated with a spatial gradient below a pre-defined gradient threshold; and recognizing a fingertip touch input in response to the number of conductive lines determined being below a pre-defined number.