Retrospective Illumination Correction of Retinal Images

Table 1

Study of suitability of different optimizers for the task of optimization of Shannon’s entropy. The best values are highlighted.

	Nongradient-based methods			Gradient-based methods
	Amoeba	Powell	CRS	L-BFGS	L-BFGS-B	GD	CG
𝜉𝑝𝑜𝑠𝑡	0.16	0.23	0.14	0.13	0.14	0.09	0.18
𝑡 [s]	68.6	95.6	514	14.7	15.5	45.9	410
N	163	226	1201	26.4	21.0	57.4	615
ρ [%]	44.5	18.6	52.9	55.9	51.3	67.7	36.9

𝜉_pre=0.28.