CT Image Segmentation Method Combining Wavelet Transform and RSF Model

Jue Wang; Xiuying Zhang; Yufang Cai; Yanping Lu

doi:10.3788/AOS202040.2110003

Acta Optica Sinica, Volume. 40, Issue 21, 2110003(2020)

CT Image Segmentation Method Combining Wavelet Transform and RSF Model

Jue Wang^1,2、*, Xiuying Zhang^1,2, Yufang Cai^1,2, and Yanping Lu^1,2

Author Affiliations

¹College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China

²Engineering Research Center of Industrial Computed Tomography Nondestructive Testing, Ministry of Education, Chongqing University, Chongqing 400044, China

show less

Abstract Get PDF(in Chinese)

Figures & Tables(14)

Fig. 1. Diagram of blade structure

Download full size

Fig. 2. Weak edge of CT image. (a) CT image of blade; (b) region of interest

Download full size

Fig. 3. Flow chart of CT image measurement

Download full size

Fig. 4. CT images. (a) Sample 1; (b) sample 2; (c) sample 3

Download full size

Fig. 5. Comparison before and after wavelet transform. (a) Sample 1; (b) sample 2; (c) sample 3

Download full size

Fig. 6. Grayscale comparison. (a) Sample 1; (b) sample 2; (c) sample 3

Download full size

Fig. 7. Comparison of segmentation results

Download full size

Fig. 8. Comparison of CV and RSF segmentation effects. (a)-(c) Segmentation results of CV and its local enlargement; (d)-(f) segmentation results of RSF and its local enlargement

Download full size

Fig. 9. Segmentation results of RSF and CV combined wavelet transform on multi-cavity blade. (a) WT+CV; (b) WT+RSF

Download full size

Fig. 10. CT image segmentation results of standard gauge blocks. (a) Original image; (b) CV; (c) WT+RSF

Download full size

Table 1. Parameters of experiment
View table
Table 1. Parameters of experiment
Sample No. CT system X-ray energy /kV X-ray current /mA Image matrix Single pixel size /mm
1 Linear array 400 1 1065×1065 0.1390
2 Linear array 400 1 1065×1065 0.1390
3 Planer array 420 1 1792×1024 0.0650

Table 2. Local average gradient of image
View table
Table 2. Local average gradient of image
Sample No. Before wavelet transform After wavelet transform
1 0.8994 0.9299
2 0.6718 0.6893
3 0.3194 0.4456

Table 3. Experimental parameter setting
View table
Table 3. Experimental parameter setting
Sample No. λ₁ λ₂ μ ν σ N_iter
1 1.0 1.0 1 0.045×255×255 3 7000
2 1.0 1.0 1 0.018×255×255 3 6500
3 1.0 1.0 1 0.045×255×255 3 6000

Table 4. Test results of standard gauge blocks

View table

Table 4. Test results of standard gauge blocks

No.	Standard length /mm	Actual measurement length /mm		Absolute error /mm		Relative error /%
No.	Standard length /mm	CV	WT+RSF	CV	WT+RSF	CV	WT+RSF
1	20	20.1273	20.0662	0.1273	0.0662	0.6365	0.3310
2	10	10.0803	10.1167	0.0803	0.1167	0.8030	1.1670
3	8	8.0570	8.0217	0.0570	0.0217	0.7125	0.2713
4	6	6.0394	6.0030	0.0394	0.0030	0.6567	0.0500
5	5	5.0495	5.0027	0.0495	0.0027	0.9900	0.0540
6	4	4.1158	3.9862	0.1158	0.0138	2.8950	0.3450
7	3	3.0229	2.9800	0.0229	0.0200	0.7633	0.6667
8	2	2.0215	1.9954	0.0215	0.0046	1.0750	-0.2300
9	1	0.9880	1.0064	0.0120	0.0064	-1.2000	0.6400

Tools

Get Citation

Copy Citation Text

Jue Wang, Xiuying Zhang, Yufang Cai, Yanping Lu. CT Image Segmentation Method Combining Wavelet Transform and RSF Model[J]. Acta Optica Sinica, 2020, 40(21): 2110003

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites