Feature-Based Retinal Image Registration Using D-Saddle Feature

Table 4

Correlation between registration accuracy and image quality metrics in FIRE dataset.

		Registration accuracy
		GDB-ICP	Harris-PIIFD	H-M	Saddle	D-Saddle
Intensity difference (MSE)	Spearman’s rho (rs)	0.205	0.395	0.326	0.341	0.269
	value (p)	0.064	<0.001	<0.001	<0.001	0.002
Structure similarity (SSIM)	Spearman’s rho (rs)	−0.030	−0.094	−0.013	−0.071	−0.015
	value (p)	0.788	0.288	0.878	0.417	0.863
Intensity uniformity (UN)	Spearman’s rho (rs)	0.193	−0.093	0.037	0.016	0.001
	value (p)	0.083	0.297	0.673	0.853	0.994

Correlation is significant at the 0.05 level. Correlation is significant at the 0.01 level.