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Error Introduced by: Image Analysis Software Camera & Part Holder “..any sufficiently advanced technology is indistinguishable from magic.” Arthur C. Clark.

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Presentation on theme: "Error Introduced by: Image Analysis Software Camera & Part Holder “..any sufficiently advanced technology is indistinguishable from magic.” Arthur C. Clark."— Presentation transcript:

1 Error Introduced by: Image Analysis Software Camera & Part Holder “..any sufficiently advanced technology is indistinguishable from magic.” Arthur C. Clark August 2008

2 Background: Three different areas of error on the possible accuracy that can be obtained are explored: Background: Three different areas of error on the possible accuracy that can be obtained are explored: - Image Analysis Software - Camera and lens - Placement of the sprinkler

3 Requirement: Confirm that image analysis software does not introduce additional errors into the measurements. Requirement: Confirm that image analysis software does not introduce additional errors into the measurements.

4 Image Analysis Software Results u See the attached spreadsheet document - 26 Measurements performed 121 times

5 u Image analysis software was used to process the same image a number of times. u 121 measurements were performed u Std.Dev. over all 26 measurements = 0 Image Analysis Software

6 Requirement: Confirm that image analysis software does not introduce additional errors into the measurements. Requirement: Confirm that image analysis software does not introduce additional errors into the measurements. CONFIRMED: The image analysis software introduces zero error

7 Requirement: Calculate the error introduced by the current camera / lens configuration. Requirement: Calculate the error introduced by the current camera / lens configuration.

8 u Image analysis software was used to process different images of the same object, without moving the sprinkler u All results are in MM (7 pixels per MM) Camera / Lens Error

9 u The following measurements were performed: u 1 Boss Width (D) u 3 Spanner Flat (D) u 4 NPT Boss Width (D) u 5 Window Width (L) u 11 Arm Angle (D) Camera / Lens Error

10 1 Boss Width (D) MAX 9.89679 MIN 9.89234 AVG 9.893094 STD DEV 0.001316 IMG_6385.JPG9.8033 IMG_6386.JPG9.8017 IMG_6387.JPG9.8038 IMG_6388.JPG9.8029 IMG_6389.JPG9.8033 IMG_6390.JPG9.8045 IMG_6391.JPG9.802 IMG_6392.JPG9.801712 IMG_6393.JPG9.802017 IMG_6394.JPG9.801773 IMG_6395.JPG9.802506

11 3 Spanner Flat (D) IMG_6550.JPG9.62081922.96144 IMG_6549.JPG9.62074323.05205 IMG_6448.JPG9.62014823.14296 IMG_6547.JPG9.62014823.05209 IMG_6546.JPG9.62017823.05219 IMG_6545.JPG9.620323.14311 IMG_6544.JPG9.62016323.05222 IMG_6543.JPG9.62025523.05217 IMG_6542.JPG9.62077323.05232 MAX 23.14311 MIN 22.96144 AVG 23.06228 STD DEV 0.054572

12 4 NPT Boss Width (D) IMG_6560.JPG9.8924123.596603 IMG_6559.JPG9.89285323.596664 IMG_6558.JPG9.89283823.596741 IMG_6557.JPG9.89286823.596603 IMG_6556.JPG9.89242623.596664 IMG_6555.JPG9.8923423.596649 IMG_6554.JPG9.89292923.596603 IMG_6553.JPG9.8967923.59668 IMG_6552.JPG9.89277723.596649 IMG_6551.JPG9.89271623.596619 MAX 23.596741 MIN 23.596603 AVG 23.596648 STD DEV 0.00004

13 11 Arm Angle (D) No 2 IMG_6550.JPG9.62081922.9614423.6874852.34871 No 2 IMG_6549.JPG9.62074323.0520523.6874692.33359 No 2 IMG_6448.JPG9.62014823.1429623.6883392.33551 No 2 IMG_6547.JPG9.62014823.0520923.5965882.34681 No 2 IMG_6546.JPG9.62017823.0521923.6873322.3543 No 2 IMG_6545.JPG9.620323.1431123.5965732.35617 No 2 IMG_6544.JPG9.62016323.0522223.6874542.34642 No 2 IMG_6543.JPG9.62025523.0521723.5966342.33547 No 2 IMG_6542.JPG9.62077323.0523223.596682.35782 MAX 2.35782 MIN 2.33359 AVG 2.34609 STD DEV 0.00932

14 Requirement: Error introduced by the current camera configuration: Requirement: Error introduced by the current camera configuration: The camera, under the current capture technique, introduces the following errors: u 1 Boss Width = 0.001 mm (100X) u 3 Spanner Flat = 0.05 mm (40 X) u 4 NPT Boss Width = 0.00004 mm ( 1 000X) u 11 Arm Angle = 0.009 degrees (50X)

15 Requirement: Calculate the error introduced by the current sprinkler holder configuration. Requirement: Calculate the error introduced by the current sprinkler holder configuration.

16 u Image analysis software was used to process different images of the same object, replacing the sprinkler in the same position on the holder each time Sprinkler Holder Error

17 u The following measurements were performed: u 1 Boss Width (D) u 4 NPT Boss Width (D) u 5 Window Width (L) u 6 Window Height (L) u 7 Deflector Boss Length (D) Sprinkler Holder Error

18 1 Boss Width (D) MAX 9.909 MIN 9.892 AVG 9.90001 STD DEV 0.0054 1 IMG_6398.JPG9.900665 2 IMG_6399.JPG9.90979 3 IMG_6400.JPG9.902832 4 IMG_6401.JPG9.892059 5 IMG_6402.JPG9.898117 6 IMG_6403.JPG9.896362 7 IMG_6404.JPG9.898239 8 IMG_6405.JPG9.907791 9 IMG_6406.JPG9.895783 10 IMG_6407.JPG9.898514 u Less 0.001 mm camera error = 0.004 mm

19 4 NPT Boss Width (D) MAX 23.5077 MIN 23.5058 AVG 23.5062 STD DEV 0.00058 1 IMG_6398.JPG9.90066523.50592 2 IMG_6399.JPG9.9097923.505966 3 IMG_6400.JPG9.90283223.506348 4 IMG_6401.JPG9.89205923.505814 5 IMG_6402.JPG9.89811723.506317 6 IMG_6403.JPG9.89636223.505829 7 IMG_6404.JPG9.89823923.507782 8 IMG_6405.JPG9.90779123.505997 9 IMG_6406.JPG9.89578323.506439 10 IMG_6407.JPG9.89851423.506424 u Less 0.00004 mm camera error = 0.00054 mm

20 5 Window Width (L) 1 IMG_6398.JPG9.90066523.5059219.15367 2 IMG_6399.JPG9.9097923.50596619.15457 3 IMG_6400.JPG9.90283223.50634819.1501 4 IMG_6401.JPG9.89205923.50581419.14993 5 IMG_6402.JPG9.89811723.50631719.14958 6 IMG_6403.JPG9.89636223.50582919.14973 7 IMG_6404.JPG9.89823923.50778219.14954 8 IMG_6405.JPG9.90779123.50599719.15273 9 IMG_6406.JPG9.89578323.50643919.1553 10 IMG_6407.JPG9.89851423.50642419.15002 MAX 19.1553 MIN 19.14954 AVG 19.15152 STD DEV 0.002

21 6 Window Height (L) 1 IMG_6398.JPG9.90066523.5059219.1536721.634216 2 IMG_6399.JPG9.9097923.50596619.1545721.615906 3 IMG_6400.JPG9.90283223.50634819.150121.650757 4 IMG_6401.JPG9.89205923.50581419.1499321.651489 5 IMG_6402.JPG9.89811723.50631719.1495821.634888 6 IMG_6403.JPG9.89636223.50582919.1497321.612305 7 IMG_6404.JPG9.89823923.50778219.1495421.62146 8 IMG_6405.JPG9.90779123.50599719.1527321.634888 9 IMG_6406.JPG9.89578323.50643919.155321.609192 10 IMG_6407.JPG9.89851423.50642419.1500221.612915 MAX 21.651489 MIN 21.609192 AVG 21.627802 STD DEV 0.015

22 7 Deflector Boss Length (D) Sprinkler No 2 1 IMG_6398.JPG9.90066523.5059219.1536721.63421615.247559 2 IMG_6399.JPG9.9097923.50596619.1545721.61590615.222656 3 IMG_6400.JPG9.90283223.50634819.150121.65075715.276001 4 IMG_6401.JPG9.89205923.50581419.1499321.65148915.20105 5 IMG_6402.JPG9.89811723.50631719.1495821.63488815.202026 6 IMG_6403.JPG9.89636223.50582919.1497321.61230515.247314 7 IMG_6404.JPG9.89823923.50778219.1495421.6214615.251221 8 IMG_6405.JPG9.90779123.50599719.1527321.63488815.24707 9 IMG_6406.JPG9.89578323.50643919.155321.60919215.262085 10 IMG_6407.JPG9.89851423.50642419.1500221.61291515.247803 MAX 15.276001 MIN 15.20105 AVG 15.240479 STD DEV 0.02

23 Requirement: Error introduced by the sprinkler holder: Requirement: Error introduced by the sprinkler holder: The sprinkler holder introduces the following errors: u 1 Boss Width = 0.004 mm (100X) u 4 NPT Boss Width = 0.00054 mm (1 000X) u 5 Window Width = 0.002 mm (500X) u 6 Window Height = 0.015 mm (150X) u 7 Deflector Boss Length = 0.02 mm (50X)

24 The measurements not performed require a suitable sprinkler holder in order to obtain measurements of: u 2 Arms 9 Arm Widths u 12 Concentricity 13 /14 Porosity Further manual measurements will produce similar excellent results. A repeatable sprinkler holder which can do thousands of measurements is required.

25 IN SUMMARY: Three different areas of accuracy were explored: IN SUMMARY: Three different areas of accuracy were explored: - Image Analysis Software introduces no error; - The camera / lens introduces a small error and largest error is the sprinkler holder

26 IN SUMMARY: IN SUMMARY: With careful placement of the sprinkler, an accuracy between 50 – 1 000 X that required can be obtained.

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