FIELD: physics.SUBSTANCE: image-forming apparatus includes an array of sub-diffraction limit-sized light receptors formed in a substrate having a light receiving surface. Each light receptor is configured to output a scalar valued multi-bit element and change state based on absorption of at least one photon. The apparatus further includes an optical filter system disposed over the light receiving surface, the optical filter system having an array of filter pixels each having an associated pass-band spectral characteristic. A data element obtained from the array of sub-diffraction limit-sized light receptors includes a combination of a plurality of the multi-bit elements output from a plurality of light receptors that underlie filter pixels having at least two different pass-band spectral characteristics.EFFECT: high optical sensor sensitivity and improved colour accuracy.20 cl, 11 dwg
COLOUR FILTERS FOR SUB-DIFFRACTION LIMIT-SIZED SENSORS