1. Date of download: 6/27/2016 Copyright © 2016 SPIE. All rights reserved. The main characteristic parameters of the oil seal spring. Figure Legend: From: Inspection algorithm based on Gaussian filtering for oil seal spring Opt. Eng. 2014;53(10):102108. doi:10.1117/1.OE.53.10.102108

2. Date of download: 6/27/2016 Copyright © 2016 SPIE. All rights reserved. The unqualified spring with the amount of insertion not sufficient. (a) The detected spring and (b) the outer edge of the detected spring. Figure Legend: From: Inspection algorithm based on Gaussian filtering for oil seal spring Opt. Eng. 2014;53(10):102108. doi:10.1117/1.OE.53.10.102108

3. Date of download: 6/27/2016 Copyright © 2016 SPIE. All rights reserved. The unqualified spring with the amount of insertion more than required. (a) The detected spring and (b) the outer edge of the detected spring. Figure Legend: From: Inspection algorithm based on Gaussian filtering for oil seal spring Opt. Eng. 2014;53(10):102108. doi:10.1117/1.OE.53.10.102108

4. Date of download: 6/27/2016 Copyright © 2016 SPIE. All rights reserved. Schematic diagram to determine whether there is a spring. Figure Legend: From: Inspection algorithm based on Gaussian filtering for oil seal spring Opt. Eng. 2014;53(10):102108. doi:10.1117/1.OE.53.10.102108

5. Date of download: 6/27/2016 Copyright © 2016 SPIE. All rights reserved. The distance of each spring wire covering. Figure Legend: From: Inspection algorithm based on Gaussian filtering for oil seal spring Opt. Eng. 2014;53(10):102108. doi:10.1117/1.OE.53.10.102108

6. Date of download: 6/27/2016 Copyright © 2016 SPIE. All rights reserved. Separation of the form data and the waviness data. Figure Legend: From: Inspection algorithm based on Gaussian filtering for oil seal spring Opt. Eng. 2014;53(10):102108. doi:10.1117/1.OE.53.10.102108

7. Date of download: 6/27/2016 Copyright © 2016 SPIE. All rights reserved. Defects detection of the connecting part. (a) The waviness data of the spring with the amount of insertion more than required and (b) the waviness data of the spring with the amount of insertion not sufficient. Figure Legend: From: Inspection algorithm based on Gaussian filtering for oil seal spring Opt. Eng. 2014;53(10):102108. doi:10.1117/1.OE.53.10.102108

8. Date of download: 6/27/2016 Copyright © 2016 SPIE. All rights reserved. The detecting result of the unqualified spring with the amount of insertion more than required. (a) The detected spring, (b) the outer edge of the detected spring, (c) the distance vector data A of the outer edge, (d) the shape vector of the outer edge, (e) the waviness vector of the outer edge, and (f) the detail of the waviness data on the connecting part. Figure Legend: From: Inspection algorithm based on Gaussian filtering for oil seal spring Opt. Eng. 2014;53(10):102108. doi:10.1117/1.OE.53.10.102108

9. Date of download: 6/27/2016 Copyright © 2016 SPIE. All rights reserved. The detecting result of the unqualified spring with the amount of insertion not sufficient. (a) The detected spring, (b) the outer edge of the detected spring, (c) the distance vector data A of the outer edge, (d) the shape vector of the outer edge, (e) the waviness vector of the outer edge, (f) the detail of the waviness data on the connecting part. Figure Legend: From: Inspection algorithm based on Gaussian filtering for oil seal spring Opt. Eng. 2014;53(10):102108. doi:10.1117/1.OE.53.10.102108

10. Date of download: 6/27/2016 Copyright © 2016 SPIE. All rights reserved. The effect of changing the cut-off values on the detected parameters of H and L. (a) The effect of changing the cut-off values on the detected parameters H and (b) the effect of changing the cut-off values on the detected parameters L. Figure Legend: From: Inspection algorithm based on Gaussian filtering for oil seal spring Opt. Eng. 2014;53(10):102108. doi:10.1117/1.OE.53.10.102108