Speckle Noise Removal Model Based on Diffusion Equation and Convolutional Neural Network

Table 4

Noise variance estimation results on different test images.

Test image	I	II	III	IV	V	VI	VII	VIII	Average error
σ = 4	4.125	4.027	4.039	4.031	3.945	4.042	3.994	4.028	0.044
σ = 9	9.120	9.029	9.052	9.063	9.158	9.061	9.016	8.966	0.066
σ = 16	15.901	16.057	16.101	16.112	15.867	16.073	16.026	16.059	0.082