1. An apparatus comprising: an input for receiving data representative of an intensity of an image at a pixel position; a processor for filtering the data to remove noise, wherein the processor filters the data based on at least one parameter associated with one or more characteristics of a sensor through which the image was captured, wherein the processor determines a standard deviation of the noise based on at least one of a quantum efficiency (q), a pedestal level (p), or an analogue gain (α) associated with the sensor; and an output for providing the filtered data.