Analysis and processing of pixel binning for color image sensor

EURASIP Journal on Advances in Signal Processing

Table 1 Reconstruction performance in PSNR with various noise levels

Noise (σ_n)	Color	LR-CFA	HR-CFA	HR-CFA + binning
		[19]	[19] + DS	PO + [19]	K + [19]	K + Proposed
0.000	R	48.1787	51.4671	45.2485	45.3275	47.8061
	G	51.8147	54.7110	46.5344	47.1429	48.6259
	B	46.5116	50.9532	43.6715	44.5752	45.5689
0.005	R	47.1788	46.5149	44.6596	44.7572	46.8994
	G	50.1223	48.5953	46.3633	41.5903	47.6607
	B	45.6221	45.2237	43.1426	43.9331	44.6091
0.010	R	45.4430	42.1931	43.4914	43.5929	45.2686
	G	47.6553	43.9223	44.5383	44.9318	45.9540
	B	44.0420	40.7293	42.0733	42.7001	42.9732
0.015	R	43.7677	39.1858	42.2368	42.3349	43.6632
	G	45.5264	40.7919	4.18183	43.4857	44.3119
	B	42.4968	37.6716	40.9172	41.4211	41.3987
0.020	R	42.2672	36.9118	41.0434	41.1293	42.2202
	G	43.7388	38.4621	41.9128	42.1503	42.8488
	B	41.0955	35.3795	39.8064	40,2189	39.9910
0.025	R	40.9430	35.0944	39.9375	40.0160	40.9391
	G	42.2200	36.6133	40.7530	40.9454	41.5568
	B	39.8450	33.5524	38.7712	39.1164	38.7417
0.030	R	39.7693	33.5816	38.9267	38.9959	39.7997
	G	40.9107	35.0803.9327	39.7008	39.8595	40.4102
	B	38.7310	32.0235.3426	37.8168	38.1076	37.6279

Demosaicking method used for comparison is that of [19]. Here, LR ≜low resolution, HR ≜high resolution, DS ≜downsample, PO ≜PhaseOne [5], K ≜Kodak PIXELUX [7] (assumes pixel range [0,1]).