Table 2. Quantitative comparison of four ray-tracing methods

		Time (ms)	PSNR (dB) [fovea/parafovea/perifovea/near-periphery]
CS	A	182.80	-
	B	9.60	32.18/30.31/29.55/33.0
	C	15.36	44.15/40.77/36.06/35.64
	D	13.12	44.42/41.98/37.15/37.33
IN	A	159.25	-
	B	8.85	23.55/24.37/27.15/31.52
	C	17.49	36.66/35.70/35.27/36.54
	D	13.4	36.67/36.61/36.00/36.80
RU	A	282.61	-
	B	12.60	23.52/23.49/24.29/26.81
	C	23.33	35.24/33.82/31.54/30.87
	D	17.03	35.25/34.77/32.07/30.42