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New, high-resolution CMOS image sensors for mobile phones have moved beyondthe single-binnable Quad Bayer and RGBW-Kodak patterns to the double binnableHexadeca Bayer pattern featuring 4x4 tiles of like-colored pixels. Pixelbinning enables high-speed, low-power readout in low-resolution modes and, moreimportantly, a reduction of read noise via floating diffusion binning.  In this paper, we present the non-intuitive result that Nona and HexadecaBayer can be superior to Quad Bayer in demosaicking quality due to degeneraciesin the latter's spectrum. However, Hexadeca Bayer suffers from the weakness ofgenerating Quad Bayer after on round of binning.  We introduce novel double binnable RGBW and LMS CFAs, composed of 2x2 tilescapable of 4:1 floating diffusion binning, that are free from spectraldegeneracies and thus demosaic well in full resolution and both binned modes.RGBW offers a 6 dB low-light, read noise-limited, SNR advantage over Quad andHexadeca Bayer in all resolution modes, while for LMS, the correspondingadvantage is 4.2 dB.

Double Binnable RGB, RGBW and LMS Color Filter Arrays