1. A method of embedding a steganographic component in imagery captured by an image sensor, wherein the image sensor comprises a first plurality of image detectors, with a first steganographic encoder associated with at least a first group of image detectors and a second steganographic encoder associated with at least a second group of image detectors, wherein the first steganographic encoder and the second steganographic encoder are co-located with the image sensor, said method comprising: embedding steganographic data in imagery captured by the first group of image detectors with the first steganographic encoder; and embedding steganographic data in imagery captured by the second group of image detectors with the second steganographic encoder.