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

Table 2 PSNRs of periodic vs. uniform periodic block matching

Input	Peak	PSNR [dB]	np- π N8	np- π U8	np- π N16	np- π U16
Silicon	6	3.62	21.65	22.14	23.39	23.80
Silicon	9	6.65	23.92	24.21	26.15	26.21
Silicon	11	9.63	24.02	24.19	26.00	25.62
Silicon	18	12.58	26.74	26.79	27.99	28.02
Silicon	21	15.12	27.74	27.81	28.76	28.75
Silicon	21	13.64	27.80	27.94	28.86	28.89
Silicon	34	16.68	29.53	29.56	30.25	30.28
Silicon	88	22.75	31.56	31.68	31.80	31.94
Silicon	88	22.88	31.74	31.84	31.99	32.15
Gallium nitride	7	6.11	23.26	23.78	24.76	24.82
Gallium nitride	12	10.15	26.13	26.49	27.90	27.99
Gallium nitride	17	13.25	27.86	28.09	29.04	28.99
Gallium nitride	95	23.23	33.58	33.48	33.89	33.58
Silicon (disloc.)	6	2.70	18.47	19.53	17.16	19.50
Silicon (disloc.)	11	9.72	24.39	24.88	26.64	26.55
Silicon (disloc.)	15	12.73	26.34	26.50	27.65	27.44
Silicon (disloc.)	49	19.81	29.94	29.87	30.20	30.14
Silicon (disloc.)	89	22.66	31.48	31.48	31.77	31.75
Silicon (disloc.)	92	22.73	31.39	31.44	31.67	31.67

Adaptive periodic (np- π N⋆) and uniform adaptive periodic (np- π U⋆) 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.