Poisson noise removal from high-resolution STEM images based on periodic block matching

Table 1 PSNRs of local vs. adaptive periodic block matching

Input	Peak	PSNR [dB]	np-l8	np- π N8	np-l16	np- π N16
Silicon (disloc.)	6	2.70	17.96	18.47	15.07	17.16
Silicon	6	3.62	20.60	21.65	20.68	23.39
Gallium nitride	7	6.11	21.71	23.26	20.53	24.76
Silicon	9	6.65	22.25	23.92	22.60	26.15
Silicon	11	9.63	23.59	24.02	25.23	26.00
Silicon (disloc.)	11	9.72	23.78	24.39	25.30	26.64
Gallium nitride	12	10.15	24.30	26.13	24.72	27.90
Silicon	18	12.58	25.76	26.74	26.65	27.99
Silicon (disloc.)	15	12.73	25.68	26.34	26.64	27.65
Gallium nitride	17	13.25	26.18	27.86	26.51	29.04
Silicon	21	13.64	26.51	27.80	26.62	28.86
Silicon	21	15.12	27.05	27.74	27.91	28.76
Silicon	34	16.68	28.23	29.53	28.25	30.25
Silicon (disloc.)	49	19.81	29.49	29.94	29.90	30.20
Silicon (disloc.)	89	22.66	31.16	31.48	31.53	31.77
Silicon (disloc.)	92	22.73	31.14	31.39	31.50	31.67
Silicon	88	22.75	31.25	31.56	31.60	31.80
Silicon	88	22.88	31.40	31.74	31.78	31.99
Gallium nitride	95	23.23	32.28	33.58	32.30	33.89

A comparison between local (np-l ⋆) and periodic (np- π N⋆) block matching with block sizes n =8 (middle columns) and n =16 (right columns). The best result within each row and the corresponding columns (separated by wide space) is in bold face.