An Overview of the Topological Gradient Approach in Image Processing: Advantages and Inconveniences

Table 1

Comparison between several reconstruction methods, quantified by several ratios and similarity indexes, for a noisy sinogram with SNR=24.5.

Method	PSNR	SNR	SSIM	MSE
FBP	14.59	33.0	0.41	0.0342
FBP + Hamming	15.91	31.71	0.52	0.0273
Topological gradient (TV)	22.43	33.75	0.82	0.0042
Topological gradient (𝐿^1/𝐿^2)	26.18	34.01	0.94	0.0023