Fractal Characteristics of Porosity of Electrospun Nanofiber Membranes

Table 3

Porosity of electrospun nanofiber membrane in contrast experiment.

Number of samples	Threshold		Porosity (%)		Ratio
	Whole-image average gray value	Image binarization selected threshold	Mercury intrusion method	Image processing	Image selection threshold/whole-image average gray value	Mercury intrusion method/image processing
1	121.414597	104	83.043	34.0404	0.8565	2.4539
6	126.814396	109	86.123	33.6947	0.8595	2.5560
7	119.745632	102	85.519	35.4594	0.8518	2.4936
21	133.345346	113	86.606	37.5705	0.8549	2.3584
29	131.217394	113	89.107	33.4530	0.8535	2.6636
Average					0.8552	2.5028