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

Table 3 PSNRs of Anscombe and L ² distance based block similarity vs. Poisson maximum-likelihood ratios

Input	Peak	PSNR [dB]	np- π N8	pml- π N8	np- π N16	pml- π N16
Silicon (disloc.)	6	2.70	18.46	18.59	17.29	17.48
Silicon	6	3.62	21.63	21.81	23.41	23.59
Gallium nitride	7	6.11	23.24	23.25	24.80	24.84
Silicon	9	6.65	23.92	24.07	26.15	26.22
Silicon	11	9.63	24.02	24.06	26.00	25.92
Silicon (disloc.)	11	9.72	24.39	24.50	26.64	26.55
Gallium nitride	12	10.15	26.13	26.19	27.90	27.91

A comparison between non-local adaptive periodic block matching performed using L ² distances in the Anscombe transformed domain (np- π N⋆) and Poisson maximum-likelihood ratios of the true electron counts (pml- π N⋆) 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.